TY - JOUR
T1 - Effects of normobaric hypoxia on upper body critical power and anaerobic working capacity
AU - La Monica, Michael B.
AU - Fukuda, David H.
AU - Starling-Smith, Tristan M.
AU - Wang, Ran
AU - Hoffman, Jay R.
AU - Stout, Jeffrey R.
N1 - Publisher Copyright:
© 2017 Elsevier B.V.
PY - 2018/2
Y1 - 2018/2
N2 - 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.
AB - 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.
KW - Altitude
KW - Environment
KW - Fatigue
KW - Metabolism
KW - Work-time relationship
UR - http://www.scopus.com/inward/record.url?scp=85038017972&partnerID=8YFLogxK
U2 - 10.1016/j.resp.2017.12.002
DO - 10.1016/j.resp.2017.12.002
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C2 - 29247712
AN - SCOPUS:85038017972
SN - 1569-9048
VL - 249
SP - 1
EP - 6
JO - Respiratory Physiology and Neurobiology
JF - Respiratory Physiology and Neurobiology
ER -