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Related Experiment Videos

Passive and active wrist joint stiffness following eccentric exercise.

A B Leger1, T E Milner

  • 1School of Rehabilitation Therapy, Queen's University, Kingston, Ontario, Canada. AL7@post.queensu.ca

European Journal of Applied Physiology
|September 14, 2000
PubMed
Summary

Eccentric exercise-induced muscle injury reduced wrist extension strength and altered active joint stiffness. Passive joint stiffness remained unchanged, suggesting injury primarily affects contractile tissues.

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Area of Science:

  • Biomechanics
  • Exercise Physiology
  • Sports Medicine

Background:

  • Exercise-induced muscle injury (EIMI) is common in athletes.
  • Understanding its effects on joint mechanics is crucial for rehabilitation.

Purpose of the Study:

  • To investigate the impact of EIMI on passive and active wrist joint stiffness.
  • To assess changes in joint stiffness following eccentric exercise.

Main Methods:

  • Ten male subjects underwent eccentric exercise targeting wrist extensor muscles.
  • Measurements of passive and active wrist joint stiffness were taken over 11 days.
  • Maximum voluntary contraction (MVC) and range of motion (ROM) were assessed.

Main Results:

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  • Wrist extension MVC decreased by 24.5% 24 hours post-exercise.
  • Passive ROM reduced significantly, but passive stiffness at neutral position did not change.
  • Active joint stiffness at 50% MVC declined, while stiffness at 10% MVC remained stable.

    • Conclusions:

    • EIMI affects active wrist joint stiffness, particularly at higher contraction levels.
    • Changes suggest larger muscle fibers may be more susceptible to eccentric exercise injury.
    • Findings indicate potential mechanical alterations in contractile tissues rather than passive structures.