Changes in electromyographic activity, mechanical power, and relaxation rates following inspiratory ribcage muscle fatigue.

ABSTRACT: Muscle fatigue is a complex phenomenon enclosing various mechanisms. Despite technological advances, these mechanisms are still not fully understood in vivo. Here, simultaneous measurements of pressure, volume, and ribcage inspiratory muscle activity were performed non-invasively during fatigue (inspiratory threshold valve set at 70% of maximal inspiratory pressure) and recovery to verify if inspiratory ribcage muscle fatigue (1) leads to slowing of contraction and relaxation properties of ribcage muscles and (2) alters median frequency and high-to-low frequency ratio (H/L). During the fatigue protocol, sternocleidomastoid showed the fastest decrease in median frequency and slowest decrease in H/L. Fatigue was also characterized by a reduction in the relative power of the high-frequency an

SUBMITTER: Sarmento A 

PROVIDER: S-EPMC8203654 | biostudies-literature | 2021 Jun

REPOSITORIES: biostudies-literature