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 ± 2.6 y; height: 167 ± 8.6 cm; weight: 66.4 ± 9.7 kg; body fat: 27.6 ± 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 V̇ 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 V̇ O2peak, PPO, CP and AWC between conditions (N vs. H). Two-way (condition × intensity) repeated measures ANOVA was used to compare total work and time-to-exhaustion. RESULTS: H significantly reduced VO2peak (N: 1.73L/min ± .31L/min vs. H: 1.62L/min ± .27L/min, (p=.008) but had minimal effects on PPO (N: 78.08W±14.51W vs. H: 75.38W±13.46, p=.089), CP (N: 57.44W±18.89W vs. H: 56.01W±12.36W, p=.546), and AWC (N: 4.81kJ±1.01kJ vs. H: 4.56kJ±.91kJ, p=.510). No significant condition × 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.
| Identifer | oai:union.ndltd.org:ucf.edu/oai:stars.library.ucf.edu:etd-7021 |
| Date | 01 January 2018 |
| Creators | Starling-Smith, Tristan |
| Publisher | STARS |
| Source Sets | University of Central Florida |
| Language | English |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | Electronic Theses and Dissertations |
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