Effects of normobaric hypoxia on upper body critical power and anaerobic working capacity

Michael B. La Monica, David H. Fukuda, Tristan M. Starling-Smith, Ran Wang, Jay R. Hoffman, Jeffrey R. Stout

Research output: Contribution to journalArticlepeer-review

Abstract

Purpose To evaluate the effects of moderate normobaric hypoxia on the parameters of the work-time relationship in the upper body. Methods Twenty-one recreationally active men completed a graded exercise test in both normobaric hypoxia (H) and normoxia (N) to exhaustion on an arm ergometer to determine V̇O2peak and peak power output (PPO). Each participant completed four constant work-rate (CWR) arm-cranking tests at 90–120% PPO in both environmental conditions. Linear regression was used to estimate critical power (CP) and anaerobic working capacity (AWC) via work-time relationship during the CWR tests. Results H significantly reduced V̇O2peak (N: 2.34 ± 0.34 L vs. H: 2.27 ± 0.34 L, p = 0.041), PPO (N: 125.29 ± 17.98 W vs. H: 121.11 ± 17.98 W, p = 0.001), and CP (N: 90.22 ± 12.88 W vs. H: 85.26 ± 9.64 W, p = 0.042), but had no effect on AWC (N: 9.16 ± 2.81 kJ vs. H: 8.75 ± 3.23 kJ, p = 0.600). Discussion Moderate normobaric hypoxia appears to reduce CP in the upper body but has a variable effect on AWC.

Original languageEnglish
Pages (from-to)1-6
Number of pages6
JournalRespiratory Physiology and Neurobiology
Volume249
DOIs
StatePublished - Feb 2018
Externally publishedYes

Keywords

  • Altitude
  • Environment
  • Fatigue
  • Metabolism
  • Work-time relationship

All Science Journal Classification (ASJC) codes

  • Neuroscience(all)
  • Physiology
  • Pulmonary and Respiratory Medicine

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