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Erschienen in:
01.09.2003 | Original Article
The effect of inspired oxygen fraction on peak oxygen uptake during arm exercise
Erschienen in: European Journal of Applied Physiology | Ausgabe 1-2/2003
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It has been shown that peak oxygen uptake (\({\dot{V}}\)O2peak) during leg exercise is enhanced by an increased inspiratory oxygen fraction (FiO2), indicating that oxygen supply is the limiting factor. Whether oxygen supply is a limiting factor in arm exercise performance is unknown. The purpose of this study, therefore, was to examine the effect of different levels of FiO2 on \({\dot{V}}\)O2peak during arm exercise in healthy individuals. Nine men successfully performed three incremental arm-cranking exercise tests with FiO215%, FiO221% and FiO250% applied in counterbalanced order. A significant FiO2 dependency was observed for \({\dot{V}}\)O2peak (p=0.02) and power output (p=0.03) and post hoc tests revealed a significant difference in \({\dot{V}}\)O2peak between 15 and 50% FiO2 (p=0.02), but not between 15 and 21% FiO2, and 21 and 50% FiO2. The results of this study show that \({\dot{V}}\)O2peak is enhanced with increasing FiO2, and suggest that \({\dot{V}}\)O2peak during arm exercise is limited by oxygen supply rather than by the metabolic machinery within the muscle itself.