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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...

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Autores principales: Ema, Ryoichi, Suzuki, Momoka, Kawaguchi, Emi, Saito, Itaru, Akagi, Ryota
Formato: Online Artículo Texto
Lenguaje:English
Publicado: PeerJ Inc. 2018
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.
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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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