Spatial difference can occur between activated and damaged muscle areas following electrically‐induced isometric contractions - Université de Lyon
Journal Articles The Journal of Physiology Year : 2019

Spatial difference can occur between activated and damaged muscle areas following electrically‐induced isometric contractions

Abstract

Skeletal muscle isometric contractions induced by neuromuscular electrical stimulation (NMES) exercise can generate damage within activated muscles. This study aimed at comparing the localization and the extent of NMES-activated muscle areas and induced damage regions using magnetic resonance imaging. Thirteen healthy subjects performed a single bout of NMES-induced isometric contractions known to induce a decrease in maximal voluntary isometric contraction (MVC) and increase in muscle volume and transverse relaxation time (T2 ). All the parameters were measured before, immediately after (POST), 7 days (D7), 14 days (D14) and 21 days (D21) after the NMES session. Spatial normalization of T2 maps were performed to compare the localization of muscle activation areas and damaged muscle regions from statistical mapping analyses. A significant decrease in MVC was found at POST (-26 ± 9%) and in delayed time at D7 (-20 ± 6%) and D14 (-12 ± 5%). Although muscle activation was statistically detected through T2 increase at POST in superficial parts of the two muscles located beneath the stimulation electrodes (i.e. vastus lateralis and vastus medialis), alterations quantified in a delayed time from increased T2 were mainly located in the deep muscle region of the vastus lateralis (+57 ± 24% of mean T2 ) and superficial area of the vastus medialis (+24 ± 16% of mean T2 ) at D7 and were still observed in whole muscle at D21. The discrepancy between activated and damaged areas in the vastus lateralis implies that tissues other than active skeletal muscle fibres were altered during unaccustomed NMES-induced isomeric contractions.
Fichier principal
Vignette du fichier
2019_FOURE_JPhysiol_edit.pdf (1.06 Mo) Télécharger le fichier
Origin Files produced by the author(s)

Dates and versions

hal-02438449 , version 1 (06-09-2024)

Identifiers

Cite

Alexandre Fouré, Arnaud Le Troter, Augustin C. Ogier, Maxime Guye, Julien Gondin, et al.. Spatial difference can occur between activated and damaged muscle areas following electrically‐induced isometric contractions. The Journal of Physiology, 2019, 597 (16), pp.4227-4236. ⟨10.1113/JP278205⟩. ⟨hal-02438449⟩
117 View
14 Download

Altmetric

Share

More