Fig. 2.

Fatigability protocol with handgrip and EMG acquisition. a Neuromuscular fatigability protocol: the green box represents the warm-up period, lasting a maximum of 1.5 min; the orange arrows are FSC; the blue lines are MVC and the purple lines are contractions at 40% of MVC. The red points represent the maximal forces awaited allowing critical force determination, while the evolution is represented with a red spotted line. Rest duration is 20 s (*), 2 min (nos. 1 and 2), 5 min (no. 3), 1 min (no. 4), 2 min (no. 5) and 3 min (no. 6). b Parallels between the 40% MVC contractions required and the muscle activation signals recorded. FSC: fast sub-maximum contraction; MVC: maximum voluntary contraction