Cargando…

Sex difference in fatigability of knee extensor muscles during sustained low-level contractions

This study investigated whether the sex difference in fatigability of the knee extensors (KE) is explained by the sex difference in fatigue-induced changes in the shear modulus of one or more muscles of KE in 18 young men and 23 young women. The shear moduli of the resting rectus femoris and medial...

Descripción completa

Detalles Bibliográficos
Autores principales: Akagi, Ryota, Sato, Shinya, Yoshihara, Kana, Ishimatsu, Hideki, Ema, Ryoichi
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6853909/
https://www.ncbi.nlm.nih.gov/pubmed/31723215
http://dx.doi.org/10.1038/s41598-019-53375-z
_version_ 1783470126954184704
author Akagi, Ryota
Sato, Shinya
Yoshihara, Kana
Ishimatsu, Hideki
Ema, Ryoichi
author_facet Akagi, Ryota
Sato, Shinya
Yoshihara, Kana
Ishimatsu, Hideki
Ema, Ryoichi
author_sort Akagi, Ryota
collection PubMed
description This study investigated whether the sex difference in fatigability of the knee extensors (KE) is explained by the sex difference in fatigue-induced changes in the shear modulus of one or more muscles of KE in 18 young men and 23 young women. The shear moduli of the resting rectus femoris and medial and lateral vastus muscles (VL) were measured before and after a sustained contraction at 20% peak torque during a maximal voluntary isometric contraction of KE until the endurance limit, in addition to evoked torque and voluntary activation (VA%). The fatigue-induced decrease in maximal muscle strength was more prominent in men than in women. Only the VL shear modulus for men increased after the fatiguing task, and a sex difference was observed in the percentage change in the VL shear modulus before and after the fatiguing task. The fatigue-induced decreased ratio was greater for men than for women in evoked torque, but not in VA%. These results suggest that although peripheral and central fatigue both influenced the fatigue-induced decrease in maximal muscle strength regardless of sex, the sex difference in KE fatigability is explained by that in peripheral fatigue, particularly the degree of peripheral VL fatigue.
format Online
Article
Text
id pubmed-6853909
institution National Center for Biotechnology Information
language English
publishDate 2019
publisher Nature Publishing Group UK
record_format MEDLINE/PubMed
spelling pubmed-68539092019-11-19 Sex difference in fatigability of knee extensor muscles during sustained low-level contractions Akagi, Ryota Sato, Shinya Yoshihara, Kana Ishimatsu, Hideki Ema, Ryoichi Sci Rep Article This study investigated whether the sex difference in fatigability of the knee extensors (KE) is explained by the sex difference in fatigue-induced changes in the shear modulus of one or more muscles of KE in 18 young men and 23 young women. The shear moduli of the resting rectus femoris and medial and lateral vastus muscles (VL) were measured before and after a sustained contraction at 20% peak torque during a maximal voluntary isometric contraction of KE until the endurance limit, in addition to evoked torque and voluntary activation (VA%). The fatigue-induced decrease in maximal muscle strength was more prominent in men than in women. Only the VL shear modulus for men increased after the fatiguing task, and a sex difference was observed in the percentage change in the VL shear modulus before and after the fatiguing task. The fatigue-induced decreased ratio was greater for men than for women in evoked torque, but not in VA%. These results suggest that although peripheral and central fatigue both influenced the fatigue-induced decrease in maximal muscle strength regardless of sex, the sex difference in KE fatigability is explained by that in peripheral fatigue, particularly the degree of peripheral VL fatigue. Nature Publishing Group UK 2019-11-13 /pmc/articles/PMC6853909/ /pubmed/31723215 http://dx.doi.org/10.1038/s41598-019-53375-z Text en © The Author(s) 2019 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
spellingShingle Article
Akagi, Ryota
Sato, Shinya
Yoshihara, Kana
Ishimatsu, Hideki
Ema, Ryoichi
Sex difference in fatigability of knee extensor muscles during sustained low-level contractions
title Sex difference in fatigability of knee extensor muscles during sustained low-level contractions
title_full Sex difference in fatigability of knee extensor muscles during sustained low-level contractions
title_fullStr Sex difference in fatigability of knee extensor muscles during sustained low-level contractions
title_full_unstemmed Sex difference in fatigability of knee extensor muscles during sustained low-level contractions
title_short Sex difference in fatigability of knee extensor muscles during sustained low-level contractions
title_sort sex difference in fatigability of knee extensor muscles during sustained low-level contractions
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6853909/
https://www.ncbi.nlm.nih.gov/pubmed/31723215
http://dx.doi.org/10.1038/s41598-019-53375-z
work_keys_str_mv AT akagiryota sexdifferenceinfatigabilityofkneeextensormusclesduringsustainedlowlevelcontractions
AT satoshinya sexdifferenceinfatigabilityofkneeextensormusclesduringsustainedlowlevelcontractions
AT yoshiharakana sexdifferenceinfatigabilityofkneeextensormusclesduringsustainedlowlevelcontractions
AT ishimatsuhideki sexdifferenceinfatigabilityofkneeextensormusclesduringsustainedlowlevelcontractions
AT emaryoichi sexdifferenceinfatigabilityofkneeextensormusclesduringsustainedlowlevelcontractions