Abstract
The interaction between cooling and hypoxia on the rate of peripheral and central fatigue development of the knee extensors
Highlights
High altitude often comprises hypobaric hypoxia and cold ambient temperatures
Peripheral arterial oxygen saturation was significantly reduced to 85% (1) in hypoxia compared to 99% (1) in normoxia
The absolute reduction in time to task failure was not additive (e.g. 695-seconds); the relative influence of hypoxia and cold were similar in the presence of the other stressor (-48% (6) and -51% (5) for hypoxia; -21% (7) and -20% (3) for cold), supporting an independent effect
Summary
High altitude often comprises hypobaric hypoxia and cold ambient temperatures. Research examining human performance during these stressors in combination is sparse [1]. Previous findings have reported that the rate of fatigue additively increases when hypoxia and cold are combined [2]. This study investigated small muscle groups (forearm flexors) using a fixed duration (closed) exercise protocol. The present study sought to examine whether volitional exhaustion or task failure (during an open protocol) of the larger knee extensor muscles would result in a similar additive effect during combined hypoxic-cold exposure
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