Sex-related differences in motor unit behavior are influenced by myosin heavy chain during high- but not moderate-intensity contractions.
motor unit
myosin heavy chain
sex differences
vastus lateralis
Journal
Acta physiologica (Oxford, England)
ISSN: 1748-1716
Titre abrégé: Acta Physiol (Oxf)
Pays: England
ID NLM: 101262545
Informations de publication
Date de publication:
09 2023
09 2023
Historique:
revised:
18
07
2023
received:
03
11
2022
accepted:
19
07
2023
medline:
28
8
2023
pubmed:
8
8
2023
entrez:
8
8
2023
Statut:
ppublish
Résumé
Motor unit recruitment and firing rate patterns of the vastus lateralis (VL) have not been compared between sexes during moderate- and high-intensity contraction intensities. Additionally, the influence of fiber composition on potential sex-related differences remains unquantified. Eleven males and 11 females performed 40% and 70% maximal voluntary contractions (MVCs). Surface electromyographic (EMG) signals recorded from the VL were decomposed. Recruitment thresholds (RTs), MU action potential amplitudes (MUAP There were no sex-related differences in MU characteristics at 40% MVC. At 70% MVC, males exhibited greater slopes (p = 0.002) for the MUAP Both sexes exhibited an inverse relationship between MU firing rates and recruitment thresholds. However, the sex-related differences in MU recruitment and firing rate patterns and N-EMG
Substances chimiques
Myosin Heavy Chains
EC 3.6.4.1
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Pagination
e14024Informations de copyright
© 2023 Scandinavian Physiological Society. Published by John Wiley & Sons Ltd.
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