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Force-matching errors after eccentric exercise attributed to muscle soreness.

U Proske1, N S Weerakkody, P Percival

  • 1Departments of Physiology, Monash University, Melbourne, Victoria, Australia. uwe.proske@med.monash.edu.au

Clinical and Experimental Pharmacology & Physiology
|August 2, 2003
PubMed
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Muscle soreness impairs force matching ability, leading to inaccurate estimations of muscle strength. This suggests soreness may contribute to weakness after unaccustomed exercise.

Area of Science:

  • Exercise Physiology
  • Neuromuscular Function
  • Human Motor Control

Background:

  • Eccentric exercise and muscle damage can lead to reduced force production and altered sensory feedback.
  • Muscle soreness is a common consequence of unaccustomed physical activity, impacting performance.
  • Understanding the mechanisms behind exercise-induced weakness is crucial for training and rehabilitation.

Purpose of the Study:

  • To investigate the impact of muscle soreness on the ability to match submaximal voluntary contractions.
  • To determine if eccentric exercise or induced soreness affects force reproduction accuracy.
  • To explore the relationship between muscle soreness and perceived exertion during force matching.

Main Methods:

  • Human subjects performed force-matching tasks involving elbow flexor muscles.

Related Experiment Videos

  • Force matching was assessed after one arm underwent eccentric exercise or received a saline injection to induce soreness.
  • Force levels were set at 30% of maximum voluntary contraction (MVC) with visual feedback for the reference arm and without for the indicator arm.

    • Main Results:

    • Eccentric exercise of the indicator arm led to subjects overestimating their force output, matching significantly lower forces than intended.
    • When the reference arm was exercised, subjects underestimated forces, indicating altered sensory feedback.
    • Similar force-matching errors were observed when soreness was induced via saline injection, suggesting a direct role of pain/soreness.

    Conclusions:

    • Muscle soreness significantly interferes with accurate force matching, potentially due to altered motor cortex excitability.
    • The findings imply that muscle soreness contributes to the perceived weakness experienced after unaccustomed eccentric exercise.
    • This research highlights the sensory consequences of muscle damage and soreness on motor control and performance.