Journal
MUSCLE & NERVE
Volume 38, Issue 5, Pages 1466-1473Publisher
WILEY
DOI: 10.1002/mus.21127
Keywords
disuse; EMG; muscle fatigue; atrophy
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Immobilization has been reported to enhance fatigability, which is paradoxical in light of the metabolic and molecular alterations that occur in atrophied muscles. We examined whether the immobilization-induced enhancement in fatigability was associated with attenuation in the muscle metaboreflex response. Ten subjects were examined after 3 weeks of hand-forearm immobilization. The time to task failure of a handgrip contraction (20% intensity) was determined along with heart rate (HR) and mean arterial pressure (MAP) at rest, during the task and during a 2-min postexercise muscle ischemia (PEMI) test that continues to stimulate the metaboreflex. Immobilization decreased strength by 25% (P < 0.01) and increased the time to task failure by 21% (P = 0.03). However, no changes were observed for the HR and MAP responses to the exercise task or during PEMI (P > 0.05). These findings indicate that the augmentation of time to task failure with immobilization is not associated with changes in the pressor or metaboreflex responses.
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