Effects of repeated muscle contractions on the tendon structures in humans

K. Kubo, H. Kanehisa, Yasuo Kawakami, T. Fukunaga

Research output: Contribution to journalArticle

55 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)162-166
Number of pages5
JournalEuropean Journal of Applied Physiology
Volume84
Issue number1-2
DOIs
Publication statusPublished - 2001
Externally publishedYes

Fingerprint

Muscle Fatigue
Muscle Contraction
Tendons
Muscles
Quadriceps Muscle
Knee
Architectural Accessibility
Isometric Contraction
Compliance
Fatigue
Ultrasonography

Keywords

  • Fatigue
  • Humans
  • In vivo
  • Tendon structures
  • Ultrasonography

ASJC Scopus subject areas

  • Public Health, Environmental and Occupational Health
  • Physiology
  • Orthopedics and Sports Medicine
  • Physical Therapy, Sports Therapy and Rehabilitation

Cite this

Effects of repeated muscle contractions on the tendon structures in humans. / Kubo, K.; Kanehisa, H.; Kawakami, Yasuo; Fukunaga, T.

In: European Journal of Applied Physiology, Vol. 84, No. 1-2, 2001, p. 162-166.

Research output: Contribution to journalArticle

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