Fig. 3

Root mean square and mean power frequency at the start of the trial and task failure during hand grip exercise (HGE) in the flexor digitorum superficialis. Trial start and task failure represent 1 s segments of sEMG signal from one of the first three contractions and one of the final three contractions during the HGE, respectively. Values are presented as mean ± SEM. Open markers indicate significant differences from trial start, dashed line indicates significant differences between gases (p < 0.05)