Effect of combined electrical stimulation and brief muscle lengthening on torque development.
Fiche publication
Date publication
février 2024
Journal
Journal of applied physiology (Bethesda, Md. : 1985)
Auteurs
Membres identifiés du Cancéropôle Est :
Pr LEPERS Romuald
Tous les auteurs :
Pineau A, Martin A, Lepers R, Papaiordanidou M
Lien Pubmed
Résumé
This study aimed to evaluate torque production in response to the application of a brief muscle lengthening (LEN) during neuromuscular electrical stimulation (NMES) applied over the nerve trunk. Fifteen subjects participated in three experimental sessions, where NMES (1 ms, 20 and 100 Hz, 15-s duration, at an intensity evoking 5-10% of maximal voluntary contraction) was either applied alone () or in combination with a muscle LEN at three distinct speeds (60, 180 or 300°/s; ). The real and the theoretical values of torque-time integral (TTIr and TTIth, respectively) were calculated and the TTIr/TTIth ratio was quantified to determine the presence of extra-torque (ET). Results show that total muscle work (TTIr) and ET ratios were higher for NMES+LEN condition only when using 100-Hz stimulation compared to NMES condition, regardless of the LEN speed (P = 0.029; P = 0.003, respectively). This indicates that superimposing a muscle LEN to high-frequency NMES can enhance the total muscle work produced as well as the ET phenomenon, most probably due to increased afferents solicitation. This finding has potential clinical relevance, especially when trying to find ways to enhance muscle work for optimizing the effectiveness of NMES training programs and maximizing strength gains.
Mots clés
Ia afferents, Triceps surae, extra-torque
Référence
J Appl Physiol (1985). 2024 02 15;: