Twitch potentiation induced by stimulated and voluntary isometric contractions at various torque levels in human knee extensor muscles

Naokazu Miyamoto*, Toshimasa Yanai, Yasuo Kawakami

*この研究の対応する著者

研究成果: Article査読

11 被引用数 (Scopus)

抄録

The purpose of this study was to compare the extent of twitch potentiation (TP) after stimulated or voluntary contractions at identical intensities for the human knee extensor muscles. Isometric knee extensions of 10 s were performed at 20%, 40%, and 60% of maximal voluntary contraction (MVC) torque level, through percutaneous electrical stimulation of the quadriceps at 80 Hz or voluntary contraction. Twitch responses were evoked by stimulating the femoral nerve percutaneously with supramaximal intensity. The extent of TP after the stimulated contraction was greater than that after the voluntary contraction at the 20% MVC torque level, whereas a stimulated contraction induced a smaller extent of TP than did a voluntary contraction at contraction intensities higher than 40% MVC. We suggest that this contraction intensity dependence of differences in TP after stimulated and voluntary isometric conditioning contractions is responsible for differences in the recruitment pattern of motor units during the conditioning contractions.

本文言語English
ページ(範囲)360-366
ページ数7
ジャーナルMuscle and Nerve
43
3
DOI
出版ステータスPublished - 2011 3月 1

ASJC Scopus subject areas

  • 生理学
  • 臨床神経学
  • 細胞および分子神経科学
  • 生理学(医学)

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