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Title: LIFE EVENT PERCEPTION:A STRUCTURAL EQUATION MODELING APPROACH TO THE ANTECEDENTS OF THE LIFE STRESS RESPONSE.
Creator: Myers, Christopher, Bowers, Clint, University of Central Florida
Abstract / Description: It has been often argued that life events have an impact on our physical and psychological well-being. In general, research supports this connection between life events and general health, though some argue that simply experiencing life events has a measurable and predictable impact our health, while others contend that this effect is mediated by the appraisal process. Further, research has identified a number of different factors (hypothetically stratified into pre-existing beliefs, external...
Show moreIt has been often argued that life events have an impact on our physical and psychological well-being. In general, research supports this connection between life events and general health, though some argue that simply experiencing life events has a measurable and predictable impact our health, while others contend that this effect is mediated by the appraisal process. Further, research has identified a number of different factors (hypothetically stratified into pre-existing beliefs, external resources and demands, and behavioral activation and coping strategies) that may influence appraisal and general health. The current study attempts to integrate these findings by testing structural models of the relationship between life events, life stress, and general health while considering the appraisal process and other potential moderators of appraisal and general health. University students (N=204) were tested using 17 assessment measures representing 7 latent constructs of Life Events, Life Stress, Appraisal, General Health, Beliefs, External, and Activation. Results of the measurement models required model respecification to combine Appraisal and Beliefs into one construct and External and Activation into another construct, resulting in a five-factor hypothetical structural model. The resulting empirical structural model is a partially-mediated model that suggests that appraisal and pre-existing beliefs influence the relationship between life events and life stress, and that life events significantly impact measured life stress. The empirical model also indicates that general health is significantly impacted by life stress, as well as behavioral activation and external resources and demands. Practical implications of the findings and recommendations for further research were discussed.
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Date Issued: 2005
Identifier: CFE0000628, ucf:46519
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0000628

Title: MECHANICAL PROPERTIES OF THE INTERVERTEBRAL DISC AS AN ESTIMATOR OF POSTMORTEM INTERVAL.
Creator: Jackson, Jennifer, Conway, Ted, University of Central Florida
Abstract / Description: Currently, forensic scientists are only able to determine time since death (or postmortem interval) up to the first 60 hours. This is based largely on insect activity. Herein, it is proposed to use the degradation of the intervertebral disc (IVD) after death to determine a relationship between the mechanical properties of cadaveric tissue and time since death in order to extend the 60-hour window. To that end, 1 fresh human spine and 6 pig spines were each separated into sections (6 human and...
Show moreCurrently, forensic scientists are only able to determine time since death (or postmortem interval) up to the first 60 hours. This is based largely on insect activity. Herein, it is proposed to use the degradation of the intervertebral disc (IVD) after death to determine a relationship between the mechanical properties of cadaveric tissue and time since death in order to extend the 60-hour window. To that end, 1 fresh human spine and 6 pig spines were each separated into sections (6 human and 48 pig), with each section having one intact disc. The sections were buried, unearthed, and cleaned, leaving only the disc and bone. To determine the mechanical properties, each disc underwent three different tests: cyclic conditioning, compression, and stress relaxation testing. The Schapery collocation method was used to create a theoretical curve from the data for the experimental curve. Observations were made involving the corresponding k values of the curve. Although there are trends in the data for k values that approximate the experimental stress relaxation curve, a correlation could not be determined.
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Date Issued: 2005
Identifier: CFE0000666, ucf:46495
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0000666

Title: EFFECTS OF VOLUNTARY CONTROL ON PERFORMANCE RESPONSE UNDER STRESS.
Creator: Morris, Christina Shawn, Hancock, Peter A., University of Central Florida
Abstract / Description: Recent stressful environments within military and non-military domains are producing a new challenge for the lab-based study of stress on task performance, one that requires knowledge of underlying cognitive-motivational and goal orientation factors. Results of recent stress on task performance research traditionally employ metaphorical explanations (i.e., resource theory) in order to rapidly apply stimulus-response outcomes to the real world counterparts. This dissertation provides an...
Show moreRecent stressful environments within military and non-military domains are producing a new challenge for the lab-based study of stress on task performance, one that requires knowledge of underlying cognitive-motivational and goal orientation factors. Results of recent stress on task performance research traditionally employ metaphorical explanations (i.e., resource theory) in order to rapidly apply stimulus-response outcomes to the real world counterparts. This dissertation provides an alternative perspective about these metaphorical, or black box, interpretations and reveals how they may be confounded with respect to the intended real world counterpart. To examine how voluntary human control can influence traditional stress/no-stress research findings, traditional as well as exploratory paradigms were presented. Both noise and time pressure conditions produced significant differences between experimental and control groups on visual discrimination. However, when analogous cash payment-contingency conditions were employed, the traditional stress/no-stress findings were not evident. In addition, a second experiment revealed that this trend of differences (and non-differences) held consistently over 30 minutes of interrupted task performance time. This study indicates the importance of developing more diagnostic measures that include assessments of how the differences between participants' and the generalized operators' goals and motivations may alter results in stressful task environments.
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Date Issued: 2004
Identifier: CFE0000019, ucf:46134
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0000019

Title: WARNING COMPLIANCE: EFFECTS OF STRESS AND WORKING MEMORY.
Creator: Helmick-Rich, Jessica, Hancock, Peter A, University of Central Florida
Abstract / Description: ABSTRACT This study investigated the effects of cross-modality warning presentation and retention in a dual-task paradigm in a simulated military environment under various task-induced stress levels. It was also intended to determine what role working memory played in the mode of warning presentation that resulted in the highest retention and subsequent compliance. An all within participant design was created in order to determine if scores on working memory span tasks predicted performance...
Show moreABSTRACT This study investigated the effects of cross-modality warning presentation and retention in a dual-task paradigm in a simulated military environment under various task-induced stress levels. It was also intended to determine what role working memory played in the mode of warning presentation that resulted in the highest retention and subsequent compliance. An all within participant design was created in order to determine if scores on working memory span tasks predicted performance across the varying forms of warning presentation. Furthermore, task-induced stress levels were varied over the course of the experiment to identify if workload transitions affected performance. Results revealed that when the presentation format and the response format matched (e.g., verbal-verbal), behavioral compliance was greater then when presentation and response format were mismatched (e.g., verbal-pictorial). Thus, it is not necessarily the presentation type that affects compliance, but the combination of presentation and response mode. Analysis also revealed that the pictorial-pictorial warning combination resulted in greater behavioral compliance compared to verbal-verbal or written-written combinations. The format of warning presentation did not affect performance on the operational tasks as predicted. Thus, the visual/spatial operational task, regardless of its complexity was not interrupted in timesharing with intra-modal warning presentations or cross-modal time-sharing. As predicted, task based stress affected the WCCOM task in all experimental procedures. Results further revealed that as task demand increased, performance on the WCCOM task decreased. Task demand did affect the operational tasks, the shooting and the navigation tasks. The shooting task, which was less complex than the navigation task was not affected by lower levels of task demand, but at the greatest level of demand (eight warnings) performance in the operational task, degraded. Degradations in performance on the more complex task, the navigation task, materialized at a moderate level of task demand (four warnings). For subjective ratings, task demand did affect workload ratings. As the task demand increased, the subjective workload ratings also increased, revealing a true association between workload and subjective ratings. The working memory separability hypothesis was supported by the working memory span tasks, but consequently they were not predictive of the warning presentation format.
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Date Issued: 2005
Identifier: CFE0000725, ucf:46624
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0000725

Title: THE RELATIONSHIP OF PARENTS' WORK STRESS AND CHILD FUNCTIONING IN THE CONTEXT OF SPILLOVER EFFECTS, MARITAL AND PARENTING STRESS, AND PARENTS' PERCEPTIONS.
Creator: Hare, Megan, Renk, Kimberly, University of Central Florida
Abstract / Description: Given that working is something parents cannot avoid in our society, understanding the ramifications that work stress can have is an important tool in today's society. This study sought to investigate the impact of parents' work stress on young children in the context of work-family spillover, parenting stress, marital stress, and perceptions of parenting. As part of this study, 106 working parents of children who ranged in age from 1- to 5-years rated their stress levels across multiple...
Show moreGiven that working is something parents cannot avoid in our society, understanding the ramifications that work stress can have is an important tool in today's society. This study sought to investigate the impact of parents' work stress on young children in the context of work-family spillover, parenting stress, marital stress, and perceptions of parenting. As part of this study, 106 working parents of children who ranged in age from 1- to 5-years rated their stress levels across multiple domains (i.e., work, marriage, and parenting), their perceived parenting behaviors, and their young child's emotional and behavioral functioning. Correlational results of this study supported the hypothesis that these variables would be related significantly to young children's emotional and behavioral functioning. Further, hierarchical regression analyses revealed that a single variable did not predict significantly young children's internalizing and externalizing behaviors but that a combination of work stress, work-family spillover, parenting stress, marital stress, and perceptions of parenting were important in accounting for variance. The results of this study emphasized the importance of studying the selected variables collectively so that employers can evaluate current workplace policies and resources to help minimize work stress and work-family spillover.
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Date Issued: 2014
Identifier: CFH0004645, ucf:45308
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFH0004645

Title: FAMILY STRUGGLES AND SUBSTANCE USE AMONG FIRST GENERATION COLLEGE STUDENTS.
Creator: Vehabovic, Barbara, Wright, Chrysalis, University of Central Florida
Abstract / Description: The current study seeks to examine the relationship between family struggles, as measured by social class and parental marital status, and substance use among first-generation college students. 902 students from the University of Central Florida participated in an online questionnaire that assessed their social class, parents' marital status, drug and alcohol use, as well as demographic variables. Results indicated a significant positive correlation between substance use and social class as...
Show moreThe current study seeks to examine the relationship between family struggles, as measured by social class and parental marital status, and substance use among first-generation college students. 902 students from the University of Central Florida participated in an online questionnaire that assessed their social class, parents' marital status, drug and alcohol use, as well as demographic variables. Results indicated a significant positive correlation between substance use and social class as well as generational status. Males were also more likely to use drugs and alcohol than females. A regression analysis indicated social class, gender, junior and senior academic years were all identified as significant predictors of drug and alcohol use, whereas college student generational status, parents' marital status, freshmen and sophomore academic years were not. There are various possible explanations that may account for the reasoning behind first-generation students not being vulnerable to substance use, including extensive stressors specific to that population as discussed with previous literature. The findings of the current study can be implicated throughout counseling centers and prevention programs among college campuses in order to decrease the high prevalence of substance use among college students and prevent negative consequences.
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Date Issued: 2015
Identifier: CFH0004864, ucf:45489
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFH0004864

Title: PREVALENCE OF HELICOBACTER PYLORI AND HEALTH RELATED RISK FACTORS AT THE UNIVERSITY OF CENTRAL FLORIDA.
Creator: Holsonback, Evan, Saleh, Suha, University of Central Florida
Abstract / Description: Helicobacter pylori (H. pylori) is a Gram-negative bacterium that infects and resides in the gastric mucosa of humans. Without treatment, H. pylori infection may cause chronic inflammation of the gastric mucosa. This inflammation creates progressive damage to the lining of the stomach and can lead to multiple diseases located in the upper gastrointestinal region. Worldwide prevalence of H. pylori infection is estimated to be close to 50%. H. pylori has been identified as the primary cause of...
Show moreHelicobacter pylori (H. pylori) is a Gram-negative bacterium that infects and resides in the gastric mucosa of humans. Without treatment, H. pylori infection may cause chronic inflammation of the gastric mucosa. This inflammation creates progressive damage to the lining of the stomach and can lead to multiple diseases located in the upper gastrointestinal region. Worldwide prevalence of H. pylori infection is estimated to be close to 50%. H. pylori has been identified as the primary cause of peptic ulcer disease, gastric cancer, and mucosa-associated lymphoid tissue lymphoma. The purpose of this study was to identify the prevalence and risk factors associated with H. pylori infection among students, faculty, and staff at the University of Central Florida. A cross-sectional design with a convenience sample was implemented to acquire a study population of 60 participants. The sample was analyzed through the use of a twenty question survey and a rapid blood antibody test kit. The infection rate of the sample was 1.75%. Statistically significant results were found for the relationship between age and upper gastrointestinal symptoms. Trends were also noticed between alcohol consumption, stress levels, and upper gastrointestinal symptoms.
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Date Issued: 2018
Identifier: CFH2000329, ucf:45771
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFH2000329

Title: EXAMINING THE RELATIONSHIP BETWEEN FEMALE PARENTS WITH LOW PERCEIVED CONTROL AND ADOLESCENT CHILD STRESS.
Creator: Monaghan, Brendan, Sims, Valerie, University of Central Florida
Abstract / Description: Adolescence is a stressful time for many children. Changes in their environment or changes in social situations are some typical stressors that an adolescent child might encounter. Interactions with parents can also be a stressor for a child. Previous research has shown that a risk factor for a parent using harsh parenting techniques is perceived control. Parents who have low perceived control are at a higher risk to engage in physical parenting techniques or child abuse. This study included...
Show moreAdolescence is a stressful time for many children. Changes in their environment or changes in social situations are some typical stressors that an adolescent child might encounter. Interactions with parents can also be a stressor for a child. Previous research has shown that a risk factor for a parent using harsh parenting techniques is perceived control. Parents who have low perceived control are at a higher risk to engage in physical parenting techniques or child abuse. This study included 198 middle school students and their female parent or guardian pairs (296 total participants), with the adolescent participants ranging in age from 10-year-old to 14-years-old. The adult participants were evaluated for their level of perceived control and the adolescent participants were evaluated for their level of perceived stress. The results showed that parents who perceived themselves as have a low amount of control over their child's behavior (low ACF), regardless of the level of control the parents perceived the child to have over their own behavior (CCF), were linked with their child have a high level of perceived stress, F (1, 182) = 5.14, p = .025. This effect was found only for the 14-year-old participants, t (30) = 2.774, p = .009. Implications of thesis results and areas of further research are suggested. It is possible that as a child gets older and enters puberty, the parent of the child feels as if they are losing control over their child and, as a result, resort to more forceful parenting techniques to regain control.
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Date Issued: 2011
Identifier: CFH0003830, ucf:44751
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFH0003830

Title: PRE-SCREEN OF TRAITS THAT LEAD TO POST-TRAUMATIC STRESS DISORDER.
Creator: Lee, Krystal, Hancock, Peter, University of Central Florida
Abstract / Description: Post-Traumatic Stress Disorder (PTSD) is a disorder that is affecting many lives and families. Since it is believed that over 50% of Americans will experience a traumatic event and 25% will experience multiple traumatic events, PTSD is an issue that cannot be overlooked. Although PTSD is most commonly associated with war victims, the official definition of PTSD was stated in the DSM-IV as "an extreme traumatic stressor involving direct personal experience or that involves actual or threatened...
Show morePost-Traumatic Stress Disorder (PTSD) is a disorder that is affecting many lives and families. Since it is believed that over 50% of Americans will experience a traumatic event and 25% will experience multiple traumatic events, PTSD is an issue that cannot be overlooked. Although PTSD is most commonly associated with war victims, the official definition of PTSD was stated in the DSM-IV as "an extreme traumatic stressor involving direct personal experience or that involves actual or threatened death or serious injury or other threat to one's physical integrity; or witness to an event that involves death, injury, or a threat to the integrity of another person..." This definition shows that PTSD can be generalized to not only war victims but to anyone who has a traumatic experience.This study shows 82% of the participants are likely to experience PTSD if exposed to a traumatic event. This study provides a pre-screen of traits that likely lead to PTSD, in hopes to raise awareness and provide a potential cure and preventative measure in the future. Current forms of treatment include cognitive therapy; however, there is no solution. The usage of simulations such as Virtual Reality Exposure (VRE) could provide both a treatment but also a preventative measure.
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Date Issued: 2011
Identifier: CFH0003850, ucf:44690
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFH0003850

Title: THE INVESTIGATION OF A POTENTIAL LINK BETWEEN CHRONIC TRAUMATIC ENCEPHALOPATHY AND POSTTRAUMATIC STRESS DISORDER.
Creator: Driskell, Lucas, Hancock, Peter, University of Central Florida
Abstract / Description: With the advancement of protective gear and medical aid, soldiers are now surviving traumatic experiences that were once fatal. As a result, the prevalence of brain injury and posttraumatic stress disorder in military service members has grown. Those who have obtained brain injury are at risk of developing chronic traumatic encephalopathy, a neurodegenerative syndrome. To date, there is no cure, treatment, or diagnostic method (besides autopsy) for chronic traumatic encephalopathy. Because...
Show moreWith the advancement of protective gear and medical aid, soldiers are now surviving traumatic experiences that were once fatal. As a result, the prevalence of brain injury and posttraumatic stress disorder in military service members has grown. Those who have obtained brain injury are at risk of developing chronic traumatic encephalopathy, a neurodegenerative syndrome. To date, there is no cure, treatment, or diagnostic method (besides autopsy) for chronic traumatic encephalopathy. Because chronic traumatic encephalopathy and posttraumatic stress disorder present many of the same symptoms and have the possibility of deriving from the same traumatic experience, an investigation of a potential link is necessary. This study explores the possibility of chronic traumatic encephalopathy being misdiagnosed as posttraumatic stress disorder. This is done by analyzing the frequency of brain injury along with the comorbidity of posttraumatic stress disorder and brain injury. This thesis also proclaims the need for research that attempts to develop diagnostic criterion and treatment methods for chronic traumatic encephalopathy.
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Date Issued: 2012
Identifier: CFH0004295, ucf:44950
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFH0004295

Title: A COMPARISON OF TRADITIONAL AND NONTRADITIONAL COLLEGE STUDENTS' STRESS AND ITS RELATIONSHIP TO THEIR TIME MANAGEMENT AND OVERALL PSYCHOLOGICAL ADJUSTMENT.
Creator: Stagman, Debra, Mottarella, Karen, University of Central Florida
Abstract / Description: The academic demands of college can be strenuous. Nontraditional students in particular may be at risk for role conflict and overload. This study examines levels of academic stressors and reactions to stressors between traditional and nontraditional undergraduate college students in order to investigate the relationships between academic stress, time management behaviors and overall psychological adjustment between the two groups. Participants completed Gadzella's (1991) Student-Life Stress...
Show moreThe academic demands of college can be strenuous. Nontraditional students in particular may be at risk for role conflict and overload. This study examines levels of academic stressors and reactions to stressors between traditional and nontraditional undergraduate college students in order to investigate the relationships between academic stress, time management behaviors and overall psychological adjustment between the two groups. Participants completed Gadzella's (1991) Student-Life Stress Inventory, Time Management Behaviors Scale (Macan, Shahani, Dipboye, & Phillips, 1990) and the Symptom Checklist-90 Revised (Derogatis, 1994). Results reveal significant differences between traditional and nontraditional students on a subscale of the Time Management Behavior Scale measuring the ability to set goals and prioritize. Additionally, a marginally significant difference between traditional and nontraditional students was found on another subscale of the Time Management Behavior Scale measuring the mechanics of time management. These results indicate students who maintain multiple life-roles and responsibilities in addition to their role of college student are better at identifying and setting goals that need to be accomplished and prioritizing the tasks required to meet these goals. Furthermore, these students may be more adept at the mechanics involved with time management such as making list and scheduling activities in advance.
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Date Issued: 2011
Identifier: CFH0003818, ucf:44729
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFH0003818

Title: Malondialdehyde (MDA) and Glutathione Peroxidase (GPx) are elevated in Crohns disease-associated with Mycobacterium avium subspecies paratuberculosis (MAP).
Creator: Qasem, Ahmad, Naser, Saleh, Masternak, Michal, Parthasarathy, Sampath, Andl, Claudia, University of Central Florida
Abstract / Description: Inflamed tissue in Crohn's disease (CD) are continuously producing toxic oxygen metabolites leading to cellular injury and apoptosis. Here, we are evaluating the role of Mycobacterium avium subspecies paratuberculosis (MAP) in oxidative stress in CD by evaluation of lipid peroxidation and antioxidant defense activity. Specifically, we measured malondialdehyde (MDA) level and selenium-dependent glutathione peroxidase (GPx) activity in the plasma from patients and cattle infected with MAP. The...
Show moreInflamed tissue in Crohn's disease (CD) are continuously producing toxic oxygen metabolites leading to cellular injury and apoptosis. Here, we are evaluating the role of Mycobacterium avium subspecies paratuberculosis (MAP) in oxidative stress in CD by evaluation of lipid peroxidation and antioxidant defense activity. Specifically, we measured malondialdehyde (MDA) level and selenium-dependent glutathione peroxidase (GPx) activity in the plasma from patients and cattle infected with MAP. The level of MAP antibodies in bovine sera was determined by IDEXX kit whereas detection of MAP DNA was performed by IS900-based nPCR. A total of 42 cattle (21 infected with MAP and 21 healthy controls), 27 CD subjects, 27 of CD-healthy relatives, 66 subjects with various diseases and 34 non-related healthy subjects were investigated. Overall, GPx activity was significantly higher in MAP infected humans (0.80941(&)#177;0.521) versus MAP (-ve) samples (0.42367(&)#177;0.229 units/ml), P(<)0.01. Similarly, the average of GPx activity in cattle infected with MAP was 1.59(&)#177;0.65 units/ml compared to 0.46907(&)#177;0.28 units/ml in healthy cattle (P(<)0.01). Although it was not statistically significant, MDA average level was higher in MAP infected human samples versus MAP (-ve) controls (1.11(&)#177;0.185 nmol/ml versus 0.805(&)#177;0.151 nmol/ml, respectively). Similarly, MDA average level in CD samples that are MAP+ (1.703(&)#177;0.231 nmol/ml) was higher than CD samples that are MAP (-ve) (1.429(&)#177;0.187 nmol/ml). In cattle, MDA average level in MAP infected samples was significantly higher at 3.818(&)#177;0.45 nmol/ml compared to 0.538(&)#177;0.18 nmol/ml in healthy cattle (P(<)0.01). Clearly, the data demonstrated that MAP infection is associated with oxidative stress and resulting in the pathophysiology of worsening of the condition of CD patients.
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Date Issued: 2016
Identifier: CFE0006699, ucf:51906
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0006699

Title: The Impact of a Neurofeedback Training Intervention on College Students' Levels of Anxiety, Stress, Depression, and Cortisol.
Creator: McKinzie, Caitlyn, Lambie, Glenn, Hundley, Gulnora, Taylor, Dalena, Bai, Haiyan, University of Central Florida
Abstract / Description: Anxiety, depression, and stress are three of the most common experiences that impact college student functioning and academic achievement. At least one in six college students struggle with anxiety, increasing risk for developing depressive symptoms or disorders that further impact wellness. However, as mental health concerns increase across campuses, universities are not equipped to meet the demand of mental health support for college students. Neurofeedback (NF) training presents as an...
Show moreAnxiety, depression, and stress are three of the most common experiences that impact college student functioning and academic achievement. At least one in six college students struggle with anxiety, increasing risk for developing depressive symptoms or disorders that further impact wellness. However, as mental health concerns increase across campuses, universities are not equipped to meet the demand of mental health support for college students. Neurofeedback (NF) training presents as an innovative intervention to treat anxiety, depression, and stress as it is designed to regulate brain processes in an effort to increase more effective brain functioning. A quasi-experimental, nonequivalent control group design was utilized to determine differences between treatment group and waitlist control group participants' anxiety, stress, and depression scores at four time points as measured by the: (a) Beck Anxiety Inventory [BAI] (Beck, Epstein, Brown, (&) Steer, 1988); (b) Beck Depression Inventory, Second Edition [BDI-II] (Beck, Steer, (&) Brown, 1996); (c) Perceived Stress Scale [PSS] (Cohen, Kamarck, (&) Mermelstein, 1983); and (d) Social Anxiety Thought questionnaire [SAT] (Hartman, 1984). Furthermore, cortisol testing was used through assessment of saliva samples using Salimetrics Enzyme-Linked Immunosorbent Assay (ELISA). Key findings for the current investigation include: (a) a marginally significant (p = .051) difference between treatment group and control group participants' PSS (partial ?2 = .093), BDI-II (partial ?2 = .089), and SAT (partial ?2 = .052) scores over time; (b) no significance difference among participant demographics between treatment group and control group assessment scores over time; (c) no significance between treatment group and control group assessment scores and salivary cortisol levels over time; and (d) a negative relationship between the control group participants' salivary cortisol levels at pre-test on the BAI, PSS, and SAT. Finally, results are compared to previous studies. Limitations and implications as well as areas for future research are explored.
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Date Issued: 2018
Identifier: CFE0007052, ucf:51973
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0007052

Title: How Much is Enough? Trauma Recall and the Exposure Therapy Process.
Creator: Morrison, Krystal, Beidel, Deborah, Bowers, Clint, Bohil, Corey, University of Central Florida
Abstract / Description: Prevailing theoretical models of posttraumatic stress disorder (PTSD) as well as exposure therapy (EXP) methodology suggest that recall of a trauma is crucial to altering the conditioned fear response associated with PTSD (Benito (&) Walther, 2015; Craske et al., 2008; Foa (&) Kozak, 1986). However, it is unclear whether limited recall of the event impacts the EXP process and treatment outcomes. This study examined whether incomplete trauma recall affected pre-treatment PTSD severity, Initial...
Show morePrevailing theoretical models of posttraumatic stress disorder (PTSD) as well as exposure therapy (EXP) methodology suggest that recall of a trauma is crucial to altering the conditioned fear response associated with PTSD (Benito (&) Walther, 2015; Craske et al., 2008; Foa (&) Kozak, 1986). However, it is unclear whether limited recall of the event impacts the EXP process and treatment outcomes. This study examined whether incomplete trauma recall affected pre-treatment PTSD severity, Initial Fear Activation (IFA), Overall Fear Activation (OFA), Within-Session Habituation (WSH), Between-Session Habituation (BSH; overall extinction), average length of EXP sessions, number of EXP sessions, and post-treatment PTSD severity, in 166 veterans of Operation Enduring Freedom, Operation Iraqi Freedom, and Operation New Dawn, who completed EXP treatment. Contrary to predicted outcomes, the extent of recall did not attenuate veterans' participation in EXP as measured by IFA, OFA, WSH and BSH. Furthermore, less recall did not result in more severe pre-treatment PTSD, longer EXP sessions, more EXP sessions, or attenuated treatment response, as measured by the Clinician-Administered PTSD Scale for DSM-IV (CAPS; Weathers, Ruscio, (&) Keane, 1999) and PTSD Checklist Military Version (PCL-M; Weathers, Huska, (&) Keane, 1991) at pre- and post-treatment. This suggests that veterans who are unable to recall aspects of their traumatic experience can engage successfully and benefit equally from EXP akin to veterans who experience less difficulty recalling trauma details. This research is the first to examine trauma recall in the context of the EXP process and contributes to the current body of literature that aims to address the question: For whom do treatments work?
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Date Issued: 2018
Identifier: CFE0007347, ucf:52116
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0007347

Title: Probing the Effects of Substrate Stiffness on Astrocytes Mechanics.
Creator: Bizanti, Ariege, Steward, Robert, Samsam, Mohtashem, Huang, Helen, University of Central Florida
Abstract / Description: Astrocytes are among the most functionally diverse population of cells in the central nervous system (CNS) as they are essential to many important neurological functions including maintaining brain homeostasis, regulating the blood brain barrier, and preventing build-up of toxic substances within the brain, for example. Astrocyte importance to brain physiology and pathology has inspired a host of studies focused on understanding astrocyte behavior primarily from a biological and chemical...
Show moreAstrocytes are among the most functionally diverse population of cells in the central nervous system (CNS) as they are essential to many important neurological functions including maintaining brain homeostasis, regulating the blood brain barrier, and preventing build-up of toxic substances within the brain, for example. Astrocyte importance to brain physiology and pathology has inspired a host of studies focused on understanding astrocyte behavior primarily from a biological and chemical perspective. However, a clear understanding of astrocyte dysfunction and their link to disease has been hampered by a lack of knowledge of astrocyte behavior from a biomechanical perspective. Furthermore, astrocytes (and all cells) can sense and respond to their external biomechanical environment via the extracellular matrix and various other biomechanical cues.One such biomechanical cue, substrate stiffness changes within the brain under certain pathologies, which subsequently leads to changes in the biomechanical behavior of the cell. For example, increased tissue stiffness is a hallmark of brain tumors that subsequently alters astrocyte biomechanical behavior. Therefore, to gain a better understanding of this process we cultured astrocytes on stiffnesses that mimicked that of the normal brain, meningioma, and glioma and investigated astrocyte biomechanical behavior by measuring cell-substrate tractions and cell-cell intercellular stresses utilizing traction force microscopy and monolayer stress microscopy, respectively. Our findings showed an increase in traction forces, average normal intercellular stress, maximum shear intercellular stress, and strain energy proportional to increased substrate stiffness. A substrate stiffness of 4 kPa showed 2.1 fold increase in rms tractions, 1.8 fold increase in maximum shear stress, 2.6 fold increase in average normal stress, and 1.6 fold increase in strain energy. While 11 kPa showed a 4.6 fold increase in rms tractions, 6.6 fold increase in maximum shear stress, 5.2 fold increase in average normal stress, and 2.3 fold increase in strain energy. Cell velocity, on the other hand, showed a decreasing trend with increasing stiffness. This study demonstrates for the first time that astrocytes can bear intercellular stresses and that astrocyte intercellular stresses and traction can be modified using substrate stiffness. We believe this study will be of great importance to brain pathology, specifically as it relates to treatment methods for brain tumors.
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Date Issued: 2018
Identifier: CFE0007312, ucf:52126
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0007312

Title: STRESS SHIELDING MINIMIZED IN FEMORAL HIP IMPLANTS: A FINITE ELEMENT MODEL OPTIMIZED BY VIRTUAL COMPATIBILITY.
Creator: feldt, christian, Chew, Larry, University of Central Florida
Abstract / Description: Bone mechanics and traditional implant materials produce a recurring problem for patients of total hip arthroplasty (THA): the bone is "shielded" from the loading it has become accustomed to over many years of development. Bone adheres to what is called "Wolff's Law", meaning it is an adaptive structure which adjusts its geometry based on the loads experienced over its life. As the new femoral hip implant transmits reduced stresses to the remaining bone, bone tissue atrophies at the interface...
Show moreBone mechanics and traditional implant materials produce a recurring problem for patients of total hip arthroplasty (THA): the bone is "shielded" from the loading it has become accustomed to over many years of development. Bone adheres to what is called "Wolff's Law", meaning it is an adaptive structure which adjusts its geometry based on the loads experienced over its life. As the new femoral hip implant transmits reduced stresses to the remaining bone, bone tissue atrophies at the interface, permitting loosening of the implant, pain, and thereby obliging additional surgery to correct the issue. In the present work, a methodology is endeavored for creating an innovative design for femoral hip implants. The approach uncouples the finite element implant model from the bone model, in order to focus solely on expected behavior within the implant while considering the varying material behavior in unique directions and locations. The implant's internal geometry is optimized in order to better match typical, intact bone conditions. The eventual design reduces extreme changes in stresses within remnant bone such that the implant will remain implanted for greater periods of time without additional surgical attention.
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Date Issued: 2011
Identifier: CFE0004051, ucf:52891
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0004051

Title: International Saudi Female Students' Experiences of Acculturation During Their Study at an American Public University in The South (APUS).
Creator: Alzahrani, Hnan, Cintron Delgado, Rosa, Mendez, Jesse, Owens, J. Thomas, Preston, Michael, University of Central Florida
Abstract / Description: According to my literature review and my reflection of its meaning, few studies have been conducted that explore the adjustment and acculturation experiences of female international students in US colleges and universities specifically on Saudi female students. Therefore, this study explored the academic and socio-cultural experiences of Saudi female students before and after arriving in the US. Furthermore, this study identified the sources of acculturative stress and Saudi female students'...
Show moreAccording to my literature review and my reflection of its meaning, few studies have been conducted that explore the adjustment and acculturation experiences of female international students in US colleges and universities specifically on Saudi female students. Therefore, this study explored the academic and socio-cultural experiences of Saudi female students before and after arriving in the US. Furthermore, this study identified the sources of acculturative stress and Saudi female students' successful strategies for coping with these stressors. Eight Saudi female students participated in one-on-one semi-structured interviews and Moustakas' (1994) transcendental phenomenology was utilized in analyzing students' voices. During the data analysis process, there were five themes that emerged from the data, including sociocultural expectations and issues, motivation for studying abroad, challenges, coping strategies, and adaptation. The results of this study provided recommendations for American and Saudi higher education administrators and faculty concerning how to help Saudi female students adjust to American culture and campus life and provide appropriate academic environments for this growing population.
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Date Issued: 2018
Identifier: CFE0007149, ucf:52329
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0007149

Title: THE EFFECT OF COMBAT EXERCISES ON CARDIOVASCULAR RESPONSE: AN EXPLORATORY STUDY.
Creator: Gantt, MeLisa, Sole, Mary Lou, University of Central Florida
Abstract / Description: PURPOSE: Hypertension (HTN) affects one in every three adults in the United States. Often associated with the older population, this silent killer has emerged in an unsuspecting group, young military soldiers. With the rapid succession of multiple deployments, long intervals between blood pressure (BP) assessments, and the absence of cardiovascular (CV) measures during the pre and post deployment health screenings; soldiers may be at higher risk for HTN than their civilian counterparts of the...
Show morePURPOSE: Hypertension (HTN) affects one in every three adults in the United States. Often associated with the older population, this silent killer has emerged in an unsuspecting group, young military soldiers. With the rapid succession of multiple deployments, long intervals between blood pressure (BP) assessments, and the absence of cardiovascular (CV) measures during the pre and post deployment health screenings; soldiers may be at higher risk for HTN than their civilian counterparts of the same age. The purpose of this study was to explore real-time continuous CV measures of soldiers before, during, and after exposure to a simulated combat stressor as well as to assess which personal characteristics played a significant role. METHODS: Applying the Allostasis/Allostatic Load theoretical framework, a repeated measure quasi-experimental design was used to compare the CV measures of two groups: one exposed to a physical combat stressor (experimental) and the other exposed to a psychological combat stressor (control). A convenience sample of 60 college Army Reserve Officer Training Corps cadets were fitted with Tiba Medical Ambulo 2400 ambulatory BP monitors for 48 continuous hours. Several CV indices were analyzed using one-way Analysis of Variance (ANOVA), paired t-test, and independent sample t-test. Four instruments (Participant Information Sheet, State-Trait Anxiety Inventory, Paintball Perceived Stress Questionnaire, and Army Physical Fitness Test) were used to assess which characteristics played the most significant role in the CV response. RESULTS: Demographic characteristics between the two 30-cadet groups were not statistically different, with the exception of deployment history (experimental = 4, control= 0). Hours after the stress exposure, subjects in the experimental group had a higher mean awake systolic blood pressure (SBP) when compared to the control group (113.76 mm Hg vs 102.98 mm Hg, p= 009). When assessing pre and post stressor morning BP surge and evening BP decline, the control group showed the biggest change. Significant bivariate correlations (p < .05) found that: Females consistently had higher pulse rates (PR) throughout each of the phases. Age positively correlated with elevated BP during the stressor, and increased morning BP surge post stressor. African Americans had higher sleep BPs pre stressor, and decreased SBP recovery post stressor; Hispanics had higher PRs during and after the stressor. Waist circumference positively correlated with elevated BP morning surge pre stressor but, body mass index (BMI) positively correlated with elevated BP morning surge post stressor as well as elevated BP during the stressor. Family history of HTN played no significant role; however, deployment history correlated with mean awake SBP post stressor. Trait anxiety scores negatively correlated with SBP recovery while state anxiety scores positively correlated with post stressor awake mean arterial pressure and evening SPB decline. Perceived stress during the stressor negatively correlated with post stressor SBP morning surge with females reporting higher anxiety and stress. Finally, Army Physical Fitness (APFT) total scores as well as APFT run scores negatively correlated with pre and post stressor sleep PRs. DISCUSSION/IMPLICATIONS: Age, female gender, African American descent, Hispanic ethnicity, waist circumference, BMI, previous deployment history, level of fitness and the psychological stress state during and after a stressor played significant roles in soldiersÃƒÂƒÃ‚Â‚ÃƒÂ‚Ã‚Â' CV response. SBP was the most dynamic and informative of the CV indices and a psychological stressor was comparable to a physical stressor when observing the residual effect of stress. If a combat exercise was enough of a stressor to produce residual CV effects that lasted well into following morning, the residual effect of a lengthy strenuous deployment may be alarming. This study not only provided a snapshot of the CV health of incoming young soldiers, but also provided evidence to support policy change regarding the implementation of regular CV health assessments before and after deployment.
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Date Issued: 2010
Identifier: CFE0003390, ucf:48458
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0003390

Title: EFFECTS OF FLIGHT FACTORS ON PILOT PERFORMANCE, WORKLOAD, AND STRESS AT FINAL APPROACH TO LANDING PHASE OF FLIGHT.
Creator: Lee, Kyongsun, Lee, Gene, University of Central Florida
Abstract / Description: Since human errors are one of the major causes of flight accidents, the design and operation of the modern aircraft system deals with them seriously. Particularly, the pilot workload on aviation causes human errors. Whenever new procedures are introduced and operated, the aircraft capabilities have been checked in every aspect. However, there has been little study on the impact of the new procedures such as LDLP, SCDA, SATS, and Steep Angle approach on the pilot performance, workload, and...
Show moreSince human errors are one of the major causes of flight accidents, the design and operation of the modern aircraft system deals with them seriously. Particularly, the pilot workload on aviation causes human errors. Whenever new procedures are introduced and operated, the aircraft capabilities have been checked in every aspect. However, there has been little study on the impact of the new procedures such as LDLP, SCDA, SATS, and Steep Angle approach on the pilot performance, workload, and stress. In this study, different methods have been tried to understand the relationship between new procedures and the pilots in terms of performance, workload, and stress. The flight factors (e.g. flight experience, gliding angle, and approach area) were examined by the pilot performance, workload, and stress at the Ã‚Â"Final Approach to L/DÃ‚Â" phase using the single engine Cessna 172R type flight simulator. Five students and five instructor pilots from Embry-Riddle Aeronautical University in Dayton Beach, Florida, participated and they flew under four different simulation tasks of gliding angle and approach area. Their Heart Rate Variability (HRV) and NASA-Task Load Index (TLX) were measured to determine their stress level and subjective workload, respectively. In addition, Landing Performance (LP) data (e.g. landing distance, landing speed) and Above Glide Path Tracking Performance (AGPTP) data were also collected to evaluate pilot performance. As a result, the type of approach area showed a significant effect on pilot performance, workload, and stress determined by ANOVA (HRV, TLX, LP, AGPTP: all are p < .05). Flying over Ã‚Â"PopulatedÃ‚Â" area (e.g. a large city) resulted in lower pilot performance and higher pilot workload and stress than that over Ã‚Â"Non-PopulatedÃ‚Â" area (e.g. a grass field). Similarly, the levels of a gliding angle showed the statistical difference on the performance, workload, and stress (HRV, TLX, and LP: all are p < .05). During the flight with 4.5 degree, the pilots showed lower performance with higher workload and stress. However, the levels of the flight experience did not have any influence on the performance, workload, and stress levels (AGPTP, LP, TLX, HRV: all are p > .05). In conclusion, flying in Populated area and flying with a 4.5 degree gliding angle increases the workload and stress level of the pilots. In addition, when the pilots were flying over Populated area at Final Approach to L/D phase, they showed lower performance on tracking the glide path. Based on the results, stresses and workload can have a significant impact on flight performance. Therefore, in order to reduce the workload and stress that can cause human errors, it is highly recommended to carefully examine the impact of new flight procedures on pilot workload and stress before they are implemented.
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Date Issued: 2010
Identifier: CFE0003489, ucf:48937
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0003489

Title: Comparing Types of Adaptive Automation within a Multi-Tasking Environment.
Creator: Taylor, Grant, Szalma, James, Hancock, Peter, Mouloua, Mustapha, Reinerman, Lauren, University of Central Florida
Abstract / Description: Throughout the many years of research examining the various effects of automation on operator performance, stress, workload, etc., the focus has traditionally been on the level of automation, and the invocation methods used to alter it. The goal of the current study is to instead examine the utilization of various types of automation with the goal of better meeting the operator's cognitive needs, thus improving their performance, workload, and stress. The task, control of a simulated unmanned...
Show moreThroughout the many years of research examining the various effects of automation on operator performance, stress, workload, etc., the focus has traditionally been on the level of automation, and the invocation methods used to alter it. The goal of the current study is to instead examine the utilization of various types of automation with the goal of better meeting the operator's cognitive needs, thus improving their performance, workload, and stress. The task, control of a simulated unmanned robotic system, is designed to specifically stress the operator's visual perception capabilities to a greater degree. Two types of automation are implemented to support the operator's performance of the task: an auditory beep aid intended to support visual perception resources, and a driving aid automating control of the vehicle's navigation, offloading physical action execution resources. Therefore, a comparison can be made between types of automation intended to specifically support the mental dimension that is under the greatest demand (the auditory beep) against those that do not (the driving automation). An additional evaluation is made to determine the benefit of adaptively adjusting the level of each type of automation based on the current level of task demand, as well as the influence of individual differences in personality.Results indicate that the use of the auditory beep aid does improve performance, but also increases Temporal Demand and Effort. Use of driving automation appears to disengage the operator from the task, eliciting a vigilance response. Adaptively altering the level of automation to meet task demands has a mixed effect on performance and workload (reducing both) when the auditory beep automation is used. However, adaptive driving automation is clearly detrimental, causing an increase in workload while decreasing performance. Higher levels of Neuroticism are related to poorer threat detection performance, but personality differences show no indication of moderating the effects of either of the experimental manipulations. The results of this study show that the type of automation implemented within an environment has a considerable impact on the operator, in terms of performance as well as cognitive/emotional state.
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Date Issued: 2012
Identifier: CFE0004340, ucf:49414
Format: Document (PDF)
PURL: http://purl.flvc.org/ucf/fd/CFE0004340

stress (37)	+ -
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