Effects of repeated muscle contractions on the tendon structures in humans

K. Kubo*, H. Kanehisa, Y. Kawakami, T. Fukunaga

*この研究の対応する著者

研究成果査読

60 被引用数 (Scopus)

抄録

The purpose of this study was to investigate the changes in the elastic properties of tendons in humans in relation to fatigue of knee extensor muscles. The muscle fatigue test (MFT) consisted of maximal isometric contractions performed 50 times. The decline in peak moment was 43.6 (SD 19.5)%. After MFT, the muscle thickness and pennation angle of the vastus lateralis muscle (VL) significantly increased 1.5 (SD 0.7) mm (5%) and 1.7 (SD 1.8)° (11%), respectively. Before and after MFT, the elongation (l) of the tendon and aponeurosis of VL was directly measured by ultrasonography, while the subjects performed ramp isometric knee extensions up to maximal voluntary contraction. The l tended to be greater after MFT than before MFT. This difference in the l was statistically significant (P < 0.05) at force developments beyond 220 N. Furthermore, the compliance increased significantly from 2.0 (SD 0.6) · 10-2 mm · N-1 before MFT to 2.6 (SD 0.7) · 10-2 mm · N-1 after MFT (22.7%). In addition, the electromechanical delay was significantly increased from 60.6 (SD 5.9) ms before to 70.0 (SD 4.4) ms after MFT. These results suggested that the repeated muscle contractions made the tendon structures more compliant.

本文言語English
ページ(範囲)162-166
ページ数5
ジャーナルEuropean Journal of Applied Physiology
84
1-2
DOI
出版ステータスPublished - 2001
外部発表はい

ASJC Scopus subject areas

  • 整形外科およびスポーツ医学
  • 公衆衛生学、環境および労働衛生
  • 生理学(医学)

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