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Minimal Effects of Moderate Normobaric Hypoxia on the Upper-Body Work-Time Relationship in Recreationally-Active Women

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Date Issued:
2018
Abstract/Description:
INTRODUCTION: Hypoxic training protocols vary with respect to exercise modality and intensity. Variables derived from the work-time relationship, namely critical power (CP) and anaerobic working capacity (W'), have been previously examined during upper and lower-body exercise in hypoxia. However, these studies have neglected to examine women who reportedly exhibit different responses to exercise in hypoxia compared to men.PURPOSE: To evaluate the effects of moderate normobaric hypoxia on the parameters of the work-time relationship during upper body exercise in women. METHODS: Thirteen recreationally active women (age: 22.7 (&)#177; 2.6 y; height: 167 (&)#177; 8.6 cm; weight: 66.4 (&)#177; 9.7 kg; body fat: 27.6 (&)#177; 5% body fat) completed a graded exercise test in both normobaric hypoxia (H; FiO2=~14%) and normoxia (N; FiO2=~20%) to exhaustion on an arm ergometer to determine V?O2peak and peak power output (PPO). Each participant completed four constant work-rate arm-cranking tests at 90-120% PPO in both environmental conditions. Linear regression was used to estimate CP and AWC via the work-time relationship during the constant work-rate tests. Paired samples t tests compared mean differences between V?O2peak, PPO, CP and AWC between conditions (N vs. H). Two-way (condition (&)#215; intensity) repeated measures ANOVA was used to compare total work and time-to-exhaustion.RESULTS: H significantly reduced VO2peak (N: 1.73L/min (&)#177; .31L/min vs. H: 1.62L/min (&)#177; .27L/min, p=.008) but had minimal effects on PPO (N: 78.08W(&)#177;14.51W vs. H: 75.38W(&)#177;13.46, p=.089), CP (N: 57.44W(&)#177;18.89W vs. H: 56.01W(&)#177;12.36W, p=.546), and AWC (N: 4.81kJ(&)#177;1.01kJ vs. H: 4.56kJ(&)#177;.91kJ, p=.510). No significant condition (&)#215; intensity interactions were noted for total work or time-to-exhaustion (p(>).05). CONCLUSIONS: Moderate normobaric hypoxia significantly reduced VO2peak but had minimal effects on CP and AWC using the work-time model
Title: Minimal Effects of Moderate Normobaric Hypoxia on the Upper-Body Work-Time Relationship in Recreationally-Active Women.
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Name(s): Starling-Smith, Tristan, Author
Fukuda, David, Committee Chair
Stout, Jeffrey, Committee Member
Wells, Adam, Committee Member
University of Central Florida, Degree Grantor
Type of Resource: text
Date Issued: 2018
Publisher: University of Central Florida
Language(s): English
Abstract/Description: INTRODUCTION: Hypoxic training protocols vary with respect to exercise modality and intensity. Variables derived from the work-time relationship, namely critical power (CP) and anaerobic working capacity (W'), have been previously examined during upper and lower-body exercise in hypoxia. However, these studies have neglected to examine women who reportedly exhibit different responses to exercise in hypoxia compared to men.PURPOSE: To evaluate the effects of moderate normobaric hypoxia on the parameters of the work-time relationship during upper body exercise in women. METHODS: Thirteen recreationally active women (age: 22.7 (&)#177; 2.6 y; height: 167 (&)#177; 8.6 cm; weight: 66.4 (&)#177; 9.7 kg; body fat: 27.6 (&)#177; 5% body fat) completed a graded exercise test in both normobaric hypoxia (H; FiO2=~14%) and normoxia (N; FiO2=~20%) to exhaustion on an arm ergometer to determine V?O2peak and peak power output (PPO). Each participant completed four constant work-rate arm-cranking tests at 90-120% PPO in both environmental conditions. Linear regression was used to estimate CP and AWC via the work-time relationship during the constant work-rate tests. Paired samples t tests compared mean differences between V?O2peak, PPO, CP and AWC between conditions (N vs. H). Two-way (condition (&)#215; intensity) repeated measures ANOVA was used to compare total work and time-to-exhaustion.RESULTS: H significantly reduced VO2peak (N: 1.73L/min (&)#177; .31L/min vs. H: 1.62L/min (&)#177; .27L/min, p=.008) but had minimal effects on PPO (N: 78.08W(&)#177;14.51W vs. H: 75.38W(&)#177;13.46, p=.089), CP (N: 57.44W(&)#177;18.89W vs. H: 56.01W(&)#177;12.36W, p=.546), and AWC (N: 4.81kJ(&)#177;1.01kJ vs. H: 4.56kJ(&)#177;.91kJ, p=.510). No significant condition (&)#215; intensity interactions were noted for total work or time-to-exhaustion (p(>).05). CONCLUSIONS: Moderate normobaric hypoxia significantly reduced VO2peak but had minimal effects on CP and AWC using the work-time model
Identifier: CFE0007248 (IID), ucf:52184 (fedora)
Note(s): 2018-08-01
M.S.
Education and Human Performance, Educational and Human Sciences
Masters
This record was generated from author submitted information.
Subject(s): Hypoxia -- Women -- Critical Power -- Upper Body
Persistent Link to This Record: http://purl.flvc.org/ucf/fd/CFE0007248
Restrictions on Access: public 2018-08-15
Host Institution: UCF

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