Current Search: Starling-Smith, Tristan (x)
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Title
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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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Creator
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Starling-Smith, Tristan, Fukuda, David, Stout, Jeffrey, Wells, Adam, University of Central Florida
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Abstract / Description
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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...
Show moreINTRODUCTION: 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
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Date Issued
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2018
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Identifier
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CFE0007248, ucf:52184
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Format
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Document (PDF)
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PURL
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http://purl.flvc.org/ucf/fd/CFE0007248
