Fatigue responses of human triceps surae muscles during repetitive maximal isometric contractions

Yasuo Kawakami, Kenji Amemiya, Hiroaki Kanehisa, Shigeki Ikegawa, Tetsuo Fukunaga

研究成果: Article査読

80 被引用数 (Scopus)

抄録

Nine healthy men (22-45 yr) completed 100 repetitive maximal isometric contractions of the ankle plantar flexor muscles in two knee positions of full extension (K0) and flexion at 90°(K90), positions that varied the contribution of the gastrocnemii. Electromyographic activity was recorded from the medial and lateral gastrocnemii and soleus muscles by using surface electrodes. Plantar flexion torque in K0 was greater and decreased more rapidly than in K90. The electromyographic amplitude decreased over time, and there were no significant differences between muscles and knee joint positions. The level of voluntary effort, assessed by a supramaximal electrical stimulation during every 10th contraction, decreased from 96 to 70% (P < 0.05) with no difference between K0 and K90. It was suggested that a decrease in plantar flexion torque was attributable to both central and peripheral fatigue and that greater fatigability in K0 than in K90 would result from a greater contribution and hence more pronounced fatigue of the gastrocnemius muscle. Further support for this possibility was provided from changes in twitch torque.

本文言語English
ページ(範囲)1969-1975
ページ数7
ジャーナルJournal of Applied Physiology
88
6
DOI
出版ステータスPublished - 2000
外部発表はい

ASJC Scopus subject areas

  • Physiology
  • Physiology (medical)

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