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Effects of Rest Position on Ultrasound-Derived Morphological Characteristics of the Vastus Lateralis and Lower-Body Force Production
Title
Effects of Rest Position on Ultrasound-Derived Morphological Characteristics of the Vastus Lateralis and Lower-Body Force Production.
Creator
Varanoske, Alyssa, Wells, Adam, Fukuda, David, Stout, Jeffrey, Mangine, Gerald, University of Central Florida
Abstract / Description
INTRODUCTION: Ultrasound assessment of the lower body typically encompasses 10-15 minutes of supine rest prior to examination because of the potential influence of gravitational fluid shifts on tissue size and composition. However, examination of the vastus lateralis (VL) muscle requires individuals to lay in the lateral recumbent position, and this change in position may influence muscle morphological characteristics and their ability to predict muscle function.PURPOSE: The purpose of this...
Show moreINTRODUCTION: Ultrasound assessment of the lower body typically encompasses 10-15 minutes of supine rest prior to examination because of the potential influence of gravitational fluid shifts on tissue size and composition. However, examination of the vastus lateralis (VL) muscle requires individuals to lay in the lateral recumbent position, and this change in position may influence muscle morphological characteristics and their ability to predict muscle function.PURPOSE: The purpose of this investigation was to examine the effect of rest position on ultrasound-derived morphological characteristics of the VL and to determine whether or not rest position affects the relationships between muscle morphological characteristics of the VL and lower-body force and power production. METHODS: Thirty-one resistance-trained males (age: 23.0 (&)#177; 2.1 years; height: 1.79 (&)#177; 0.08 m; body mass: 87.4 (&)#177; 11.7 kg) participated in this investigation. Muscle morphological characteristics, including cross-sectional area (CSA), muscle thickness (MT), pennation angle (PA), echo intensity (UnCorEI), subcutaneous adipose tissue thickness (SFT), and EI corrected for SFT (CorEI) of the VL were assessed in the dominant limb after 15 minutes of rest in 3 recumbent positions: supine (SUP), dominant lateral recumbent (DLR), non-dominant lateral recumbent (NDLR), as well as after 15 minutes of standing (ST) and immediately after laying down (IP). Following ultrasound assessments, participants completed unilateral performance assessments, including vertical jumps (UVJ), isometric/isokinetic testing, and a 1-repetition maximum (1-RM) leg press. RESULTS: A repeated-measures analysis of variance revealed significantly different (p (<) 0.05) CSA, MT, PA, UnCorEI, and SFT in ST compared to recumbent positions after 15 minutes of rest (NDLR, DLR, and SUP). Additionally, significant differences were observed between recumbent positions for CSA, CorEI, and UnCorEI; however, no differences were observed for MT, PA, and SFT. Different magnitudes of relationships were observed between muscle morphological characteristics measured after rest in different positions and performance variables. However, muscle morphology after IP generally appears to be the best predictor of performance for most variables, although utilizing the NDLR and DLR positions may provide comparable, or potentially stronger results for variables such as IsokPF. The relationship between muscle morphology and various performance variables in ST were weaker compared to the recumbent positions examined, specifically for IsokPF, 1-RM leg press, and for all UVJ variables, except total work.CONCLUSIONS: Muscle morphology differs depending on the rest position utilized prior to ultrasound analysis. These rest positions also affect the ability for muscle morphology to predict lower-body force production. Future research should consider evaluation of muscle morphology of the VL after IP in the prediction of muscle function; however, NDLR and DLR may also be used. SUP and ST provide significantly weaker relationships for some performance variables compared to the other recumbent positions.
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Date Issued
2019
Identifier
CFE0007550, ucf:52610
Format
Document (PDF)
PURL
http://purl.flvc.org/ucf/fd/CFE0007550
Evaluation of Echogenicity Within and Between Ultrasonographic Images of the Vastus Lateralis
Title
Evaluation of Echogenicity Within and Between Ultrasonographic Images of the Vastus Lateralis.
Creator
Varanoske, Alyssa, Fukuda, David, Stout, Jeffrey, Hoffman, Jay, University of Central Florida
Abstract / Description
PURPOSE: The purpose of this study was to examine the echo intensity (EI) values of different ultrasound (US) images of the vastus lateralis (VL) using panoramic imaging in the transverse plane (PTI) and still imaging in the longitudinal plane (SLI). Secondary purposes of this study were to examine VL homogeneity and to determine relationships between subcutaneous adipose tissue thickness (SubQ) adjacent to the muscle and EI. METHODS: Twenty-four recreationally-trained collegiate males (20.2 ...
Show morePURPOSE: The purpose of this study was to examine the echo intensity (EI) values of different ultrasound (US) images of the vastus lateralis (VL) using panoramic imaging in the transverse plane (PTI) and still imaging in the longitudinal plane (SLI). Secondary purposes of this study were to examine VL homogeneity and to determine relationships between subcutaneous adipose tissue thickness (SubQ) adjacent to the muscle and EI. METHODS: Twenty-four recreationally-trained collegiate males (20.2 (&)#177; 1.6 years; height: 178.1 (&)#177; 6.6 cm; weight: 82.2 (&)#177; 13.4 kg) participated in this investigation. EI, cross-sectional area (CSA), muscle thickness (MT), and SubQ of the VL were assessed in the dominant limb (DOM) via three PTI and SLI. The best PTI was divided into three compartments of equal horizontal length (tertiles) to examine EI homogeneity. RESULTS: A repeated-measures ANOVA revealed a significant main effect for image/tertile between measures of EI (p (<) 0.001). The EI of PTI (57.976 (&)#177; 8.806 AU) was significantly lower than EI of SLI (65.453 (&)#177; 11.023 AU) (p = 0.002), however significant positive correlations existed between the two (r = 0.681; p (<) 0.001). Additionally, the EI of the SLI was significantly greater than the EI of the lateral tertile (58.717 (&)#177; 9.877 AU) (p = 0.001) and the EI of the posterior tertile (56.354 (&)#177; 9.887 AU) (p = 0.002). Although there was no significant difference between EI of the SLI and EI of the anterior tertile (59.065 (&)#177; 9.126 AU), a trend towards a significant difference was shown (p = 0.051). No significant differences in EI values between tertiles were identified. Significant differences in MT existed between PTI and SLI (PTI: 2.178 (&)#177; 0.367 cm; SLI: 2.015 (&)#177; 0.397 cm; p = 0.003), however MT values from PTI and SLI were significantly positively correlated with one another (r = 0.809, p (<) 0.001). Significant differences in SubQ existed between PTI and SLI (PTI: 0.217 (&)#177; 0.167 cm; SLI: 0.316 (&)#177; 0.225 cm; p (<) 0.001), however SubQ values from PTI and SLI were significantly positively correlated with one another (r = 0.915, p (<) 0.001). No relationship between EI and SubQ from either image was found (PTI and SubQ: r = -0.067, p = 0.754; SLI and SubQ: r = -0.114, p = 0.597). SLI yielded slightly lower standard errors of measurement (SEM) and coefficients of variation (CV), indicating better precision compared to PTI. CONCLUSIONS: EI of the VL appears to be homogeneous as assessed in a PTI in recreationally-trained collegiate males. Additionally, PTI and SLI yield different EI, CSA, MT, and SubQ values, but these values are highly correlated. The use of SLI requires less time, equipment, and technical expertise, and therefore may be advantageous for use in future studies.
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Date Issued
2016
Identifier
CFE0006193, ucf:51117
Format
Document (PDF)
PURL
http://purl.flvc.org/ucf/fd/CFE0006193