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Title: | Effect of acute severe hypoxia on peripheral fatigue and endurance capacity in healthy humans |
Authors: | Romer, LM Haverkamp, HC Amann, M Lovering, AT Pegelow, DF Dempsey, JA |
Keywords: | Hypoxemia;Muscle fatigue;Exercise performance |
Issue Date: | 2007 |
Citation: | American Journal of Physiology: Regulatory, Integrative and Comparative Physiology, 292:1, pp. R598 - R606, 2007 |
Abstract: | Effect of acute severe hypoxia on peripheral fatigue and endurance capacity in healthy humans. Am J Physiol Regul Integr Comp Physiol 292: R598–R606, 2007. First published September 7, 2006; doi:10.1152/ajpregu.00269.2006.—We hypothesized that severe hypoxia limits exercise performance via decreased contractility of limb locomotor muscles. Nine male subjects [mean SE maximum O2 uptake (V˙ O2 max) 56.5 2.7 ml kg 1 min 1] cycled at 90% V˙ O2 max to exhaustion in normoxia [NORM-EXH; inspired O2 fraction (FIO2) 0.21, arterial O2 saturation (SpO2) 93 1%] and hypoxia (HYPOX-EXH; FIO2 0.13, SpO2 76 1%). The subjects also exercised in normoxia for a time equal to that achieved in hypoxia (NORM-CTRL; SpO2 96 1%). Quadriceps twitch force, in response to supramaximal single (nonpotentiated and potentiated 1 Hz) and paired magnetic stimuli of the femoral nerve (10–100 Hz), was assessed pre- and at 2.5, 35, and 70 min postexercise. Hypoxia exacerbated exercise-induced peripheral fatigue, as evidenced by a greater decrease in potentiated twitch force in HYPOX-EXH vs. NORM-CTRL ( 39 4 vs. 24 3%, P 0.01). Time to exhaustion was reduced by more than two-thirds in HYPOX-EXH vs. NORM-EXH (4.2 0.5 vs. 13.4 0.8 min, P 0.01); however, peripheral fatigue was not different in HYPOX-EXH vs. NORM-EXH ( 34 4 vs. 39 4%, P 0.05). Blood lactate concentration and perceptions of limb discomfort were higher throughout HYPOX-EXH vs. NORM-CTRL but were not different at end-exercise in HYPOX-EXH vs. NORM-EXH. We conclude that severe hypoxia exacerbates peripheral fatigue of limb locomotor muscles and that this effect may contribute, in part, to the early termination of exercise. |
URI: | http://ajpregu.physiology.org/content/292/1/R598 http://bura.brunel.ac.uk/handle/2438/9911 |
DOI: | http://dx.doi.org/10.1152/ajpregu.00269.2006 |
metadata.dc.relation.isreplacedby: | 2438/10071 http://bura.brunel.ac.uk/handle/2438/10071 |
ISSN: | 0363-6119 |
Appears in Collections: | Sport Dept of Life Sciences Research Papers |
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