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Muscle function at the wrist after eccentric exercise.

A B Leger1, T E Milner

  • 1School of Rehabilitation Therapy, Queen's University, Kingston, Ontario K7L 3N6, Canada. AL7@post.queensu.ca

Medicine and Science in Sports and Exercise
|April 3, 2001
PubMed
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Eccentric exercise targeting wrist extensors impairs motor control and function, particularly during high-torque contractions. Recovery for both wrist extensors and flexors was observed within 10 days post-exercise.

Area of Science:

  • Biomechanics
  • Exercise Physiology
  • Motor Control

Background:

  • Eccentric exercise, characterized by muscle lengthening under load, can induce significant muscle damage and alter neuromuscular function.
  • Understanding the impact of eccentric exercise on synergistic and antagonistic muscle groups is crucial for rehabilitation and performance optimization.

Purpose of the Study:

  • To investigate the effects of strenuous eccentric exercise on wrist extensor muscles.
  • To assess the impact on the function and motor control of synergist wrist extensors and antagonist wrist flexors.

Main Methods:

  • Ten subjects underwent repeated testing over 11 days, including pre- and post-eccentric exercise assessments.
  • Evaluated muscle injury indicators: wrist extension maximum voluntary contraction (MVC), range of motion (ROM), and soreness.

Related Experiment Videos

  • Measured function and motor control: maximum joint velocity, sustained constant torque, and tracking of changing torque.

    • Main Results:

    • Eccentric exercise led to decreased wrist extension MVC and ROM, with peak effects on days 1-2, returning to baseline by day 10.
    • Subjects showed impaired ability to sustain submaximal contractions and track torque, especially at high levels, with recovery by day 10.
    • No significant change was observed in maximal wrist extension velocity.

    Conclusions:

    • Strenuous eccentric exercise significantly affects wrist extensor muscle function and motor control, particularly under high-torque demands.
    • Synergistic wrist extensors responded similarly, indicating coordinated function.
    • Antagonist wrist flexors exhibited increased coactivation post-exercise, suggesting altered neuromuscular strategies.