Key result
Acute hypoxia to 80% SpO2 induces motor unit firing changes strongly correlated with oxygen desaturation speed.
Why the study?
The mechanisms of compromised motor control during exposure to hypoxia are largely unknown, and the impact of acute hypoxia on motor unit firing characteristics needed quantification.
Does acute hypoxia alter motor unit firing characteristics during sustained isometric contractions in healthy subjects?
Does acute hypoxia alter motor unit firing characteristics during sustained isometric contractions in healthy subjects?
Acute hypoxia induces bidirectional, subject-specific changes in motor unit firing rates that correlate with individual tolerance to hypoxia.
Authors
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Individual MU firing responses to acute hypoxia vary by desaturation tolerance; leaves open mechanisms and relevance to clinical hypoxia states.
McKeown et al. (2019) studied Healthy subjects (n=10). Acute hypoxia vs. Baseline was evaluated on Motor unit firing rate changes. Acute hypoxia to 80% SpO2 induced bidirectional changes in motor unit firing rates that strongly correlated with the speed of oxygen desaturation (R2 = 0.87–0.98).
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