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Effects of sex and joint action on voluntary activation
The current study tested the hypothesis that voluntary activation during maximal voluntary contraction (MVC) conditionally depends on sex and joint action. Twenty-eight healthy adults (14 of each sex) performed knee extensor MVC and plantar flexor MVC at extended and flexed knee positions. Voluntary...
Autores principales: | , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
PeerJ Inc.
2018
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6240438/ https://www.ncbi.nlm.nih.gov/pubmed/30479907 http://dx.doi.org/10.7717/peerj.5968 |
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author | Ema, Ryoichi Suzuki, Momoka Kawaguchi, Emi Saito, Itaru Akagi, Ryota |
author_facet | Ema, Ryoichi Suzuki, Momoka Kawaguchi, Emi Saito, Itaru Akagi, Ryota |
author_sort | Ema, Ryoichi |
collection | PubMed |
description | The current study tested the hypothesis that voluntary activation during maximal voluntary contraction (MVC) conditionally depends on sex and joint action. Twenty-eight healthy adults (14 of each sex) performed knee extensor MVC and plantar flexor MVC at extended and flexed knee positions. Voluntary activation during MVC was assessed using a twitch interpolation technique. The voluntary activation during plantar flexor MVC at the extended knee position was significantly lower (P = 0.020, 95% confidence interval 1.4 to 14.6, Cohen’s d for between-subject design = 0.94) in women (88.3% ± 10.0%) than in men (96.2% ± 6.6%). In contrast, no significant sex differences were shown in the voluntary activation during knee extensor MVC (93.7% ± 5.9% (women) vs. 95.0% ± 3.9% (men)) and during plantar flexor MVC at the flexed knee position (90.4% ± 12.2% (women) vs. 96.8% ± 5.6% (men)). The voluntary activation during knee extensor MVC was significantly higher (P = 0.001, 95% confidence interval 2.1 to 8.8, Cohen’s d for within-subject design = 0.69) than that during plantar flexor MVC at the extended knee position in women, whereas the corresponding difference was not observed in men. The results revealed that the existence of sex difference in the voluntary activation during MVC depends on joint action and joint angle. |
format | Online Article Text |
id | pubmed-6240438 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2018 |
publisher | PeerJ Inc. |
record_format | MEDLINE/PubMed |
spelling | pubmed-62404382018-11-26 Effects of sex and joint action on voluntary activation Ema, Ryoichi Suzuki, Momoka Kawaguchi, Emi Saito, Itaru Akagi, Ryota PeerJ Anatomy and Physiology The current study tested the hypothesis that voluntary activation during maximal voluntary contraction (MVC) conditionally depends on sex and joint action. Twenty-eight healthy adults (14 of each sex) performed knee extensor MVC and plantar flexor MVC at extended and flexed knee positions. Voluntary activation during MVC was assessed using a twitch interpolation technique. The voluntary activation during plantar flexor MVC at the extended knee position was significantly lower (P = 0.020, 95% confidence interval 1.4 to 14.6, Cohen’s d for between-subject design = 0.94) in women (88.3% ± 10.0%) than in men (96.2% ± 6.6%). In contrast, no significant sex differences were shown in the voluntary activation during knee extensor MVC (93.7% ± 5.9% (women) vs. 95.0% ± 3.9% (men)) and during plantar flexor MVC at the flexed knee position (90.4% ± 12.2% (women) vs. 96.8% ± 5.6% (men)). The voluntary activation during knee extensor MVC was significantly higher (P = 0.001, 95% confidence interval 2.1 to 8.8, Cohen’s d for within-subject design = 0.69) than that during plantar flexor MVC at the extended knee position in women, whereas the corresponding difference was not observed in men. The results revealed that the existence of sex difference in the voluntary activation during MVC depends on joint action and joint angle. PeerJ Inc. 2018-11-15 /pmc/articles/PMC6240438/ /pubmed/30479907 http://dx.doi.org/10.7717/peerj.5968 Text en ©2018 Ema et al. http://creativecommons.org/licenses/by/4.0/ This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, reproduction and adaptation in any medium and for any purpose provided that it is properly attributed. For attribution, the original author(s), title, publication source (PeerJ) and either DOI or URL of the article must be cited. |
spellingShingle | Anatomy and Physiology Ema, Ryoichi Suzuki, Momoka Kawaguchi, Emi Saito, Itaru Akagi, Ryota Effects of sex and joint action on voluntary activation |
title | Effects of sex and joint action on voluntary activation |
title_full | Effects of sex and joint action on voluntary activation |
title_fullStr | Effects of sex and joint action on voluntary activation |
title_full_unstemmed | Effects of sex and joint action on voluntary activation |
title_short | Effects of sex and joint action on voluntary activation |
title_sort | effects of sex and joint action on voluntary activation |
topic | Anatomy and Physiology |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6240438/ https://www.ncbi.nlm.nih.gov/pubmed/30479907 http://dx.doi.org/10.7717/peerj.5968 |
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