Shift in optimal joint angle of the ankle dorsiflexors following eccentric exercise

H. D. Lee, S. J. Kim, D. Y. Lee, T. Kurihara, Y. S. Lee, Y. Kawakami

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2 Citations (Scopus)

Abstract

Exposure to unaccustomed eccentric exercise causes muscle damage. Popping sarcomere theory [1] has been proposed and assumed that eccentric contraction-induced muscle damage predominantly occurs at muscle length on the descending limb of the force-length relationship. This study investigated changes in the mechanical properties following maximum effort eccentric exercise at systematically different muscle lengths for the human ankle dorsiflexors. The results of this study showed that the eccentric exercise of the ankle dorsiflexors decreased the peak torque, shifted the optimal joint angle towards longer muscle length without changes in the level of muscle activation. However, no difference in the shift of the optimal ankle joint angle was observed between the groups that performed eccentric exercise at long muscle length (ECCL) and at short muscle length (ECCS). In conclusion, the muscle length at which the eccentric exercise was performed did not produce differential effects on the neuromechanical properties of in-vivo human ankle dorsiflexors, and thus the popping sarcomere theory might not be the sole mechanism to account for the eccentric contraction-induced optimal muscle length change.

Original languageEnglish
Pages (from-to)661-666
Number of pages6
JournalProceedings of the Society for Experimental Mechanics, Inc.
Volume67
Publication statusPublished - 2010 Dec 1

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Keywords

  • Eccentric contraction
  • Force-length relationship
  • Human
  • Muscle contraction
  • Muscle damage
  • Tibialis anterior

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering

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