Key result
Acute hypoxia progressively increased fatigue perception, increased corticospinal excitability, and decreased voluntary activation during brief (3 s) but not sustained (20 s) maximal contractions.
Why the study?
Few studies have examined the time course of changes in the motor system after acute exposure to hypoxia.
Does acute exposure to hypoxia alter corticospinal excitability, voluntary activation, and perception of fatigue during brief and sustained maximal voluntary contractions in healthy individuals?
Does acute exposure to hypoxia alter corticospinal excitability, voluntary activation, and perception of fatigue during brief and sustained maximal voluntary contractions in healthy individuals?
Acute hypoxia increases perception of fatigue and alters motor system excitability during brief, but not sustained, maximal voluntary contractions.
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Hypothesis-generating for neuromuscular control in hypoxia; leaves open relevance to clinical populations.
McKeown et al. (2020) studied Healthy (n=14). Acute hypoxia vs. Sham conditions was evaluated on Corticospinal excitability, voluntary activation, and perception of fatigue during brief (3 s) and sustained (20 s) maximal voluntary contractions. Acute hypoxia progressively increased fatigue perception, increased corticospinal excitability, and decreased voluntary activation during brief (3 s) but not sustained (20 s) maximal contractions.
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