Effects of sex and joint action on voluntary activation

Ryoichi Ema, Momoka Suzuki, Emi Kawaguchi, Itaru Saito, Ryota Akagi

Research output: Contribution to journalArticle

Abstract

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.

Original languageEnglish
Article numbere5968
JournalPeerJ
Volume2018
Issue number11
DOIs
Publication statusPublished - 2018 Jan 1

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knees
Chemical activation
gender
gender differences
confidence interval
Interpolation

Keywords

  • Knee extension
  • Plantar flexion
  • Sex difference
  • Twitch interpolation technique

ASJC Scopus subject areas

  • Neuroscience(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Agricultural and Biological Sciences(all)

Cite this

Ema, R., Suzuki, M., Kawaguchi, E., Saito, I., & Akagi, R. (2018). Effects of sex and joint action on voluntary activation. PeerJ, 2018(11), [e5968]. https://doi.org/10.7717/peerj.5968

Effects of sex and joint action on voluntary activation. / Ema, Ryoichi; Suzuki, Momoka; Kawaguchi, Emi; Saito, Itaru; Akagi, Ryota.

In: PeerJ, Vol. 2018, No. 11, e5968, 01.01.2018.

Research output: Contribution to journalArticle

Ema, R, Suzuki, M, Kawaguchi, E, Saito, I & Akagi, R 2018, 'Effects of sex and joint action on voluntary activation', PeerJ, vol. 2018, no. 11, e5968. https://doi.org/10.7717/peerj.5968
Ema R, Suzuki M, Kawaguchi E, Saito I, Akagi R. Effects of sex and joint action on voluntary activation. PeerJ. 2018 Jan 1;2018(11). e5968. https://doi.org/10.7717/peerj.5968
Ema, Ryoichi ; Suzuki, Momoka ; Kawaguchi, Emi ; Saito, Itaru ; Akagi, Ryota. / Effects of sex and joint action on voluntary activation. In: PeerJ. 2018 ; Vol. 2018, No. 11.
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