Changes in supramaximal M-wave amplitude at different regions of biceps brachii following eccentric exercise of the elbow flexors

Effect of isokinetic vs free weight on the magnitude of eccentric exercise-induced muscle damage of elbow flexors in well-trained men

“…In the present study, we observed signi cant decreases in the elbow exors peak torque both immediately after (~ 37% for ID and FW groups) and in the ensuing days following exercise (~ 27% and ~ 18% for ID and FW groups, respectively), regardless the resistance modality (cf. Figure 2), which are in well agreement with those reported in the literature [1,25,26]. On the other hand, the delayed increased in perceived muscle soreness (i.e., DOMS) after eccentric contractions would be physiologically triggered by the activation of bradykinin B2 and in ammatory cytokines that sensitize the pain nociceptors, especially in the connective tissue surrounding the musculoskeletal fascia [2].…”

“…The decrease in maximal force-generation capability, as well as the increase in perceived muscle soreness following unaccustomed eccentric contractions, are markers typically used to assess the effectiveness of eccentric protocols in inducing EIMD, with the rst being considered one of the most reliable [4]. While the isometric peak force decrease observed [25,26] immediately after the eccentric exercise would be mainly caused by neural and metabolic factors [27], the sustained reduction in the following days would arise from disturbances and structural damage of sarcomere structures [28]. In the present study, we observed signi cant decreases in the elbow exors peak torque both immediately after (~ 37% for ID and FW groups) and in the ensuing days following exercise (~ 27% and ~ 18% for ID and FW groups, respectively), regardless the resistance modality (cf.…”