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Altered Position Sense after Submaximal Eccentric Exercise-inducing Central Fatigue.

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Eccentric exercise acutely impairs knee position sense due to central fatigue, affecting neuromuscular function. This position sense deficit resolves within 48 hours, despite persistent peripheral fatigue and soreness.

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Area of Science:

  • Neuromuscular Physiology
  • Sports Science
  • Rehabilitation Medicine

Background:

  • Muscle fatigue is a common outcome of physical activity, impacting both performance and sensory feedback.
  • Eccentric exercise, characterized by muscle lengthening under tension, is known to induce significant muscle damage and fatigue.
  • Understanding the interplay between neuromuscular function, position sense, and fatigue is crucial for optimizing training and recovery.

Purpose of the Study:

  • To investigate the acute and delayed effects of submaximal eccentric exercise on knee extensor position sense.
  • To examine the impact of eccentric exercise-induced muscle fatigue on neuromuscular function.
  • To determine the relationship between central and peripheral fatigue and alterations in position sense.

Main Methods:

  • Thirteen physically active participants underwent unilateral isokinetic eccentric exercise until a 20% reduction in maximal voluntary isometric contraction (MVIC).
  • Neuromuscular parameters (MVIC, voluntary activation (VA), DB100, DB10) and psychophysical measures (position sense, soreness, fatigue) were assessed pre-exercise and at 24 and 48 hours post-exercise.
  • Bilateral position-matching tasks were used to evaluate knee joint position sense.

Main Results:

  • Eccentric exercise induced acute central and peripheral fatigue, evidenced by decreased VA, DB100, and DB10.
  • Position sense was significantly impaired immediately post-exercise, with participants overestimating knee extensor length.
  • VA deficits and position errors were correlated, suggesting a link between central fatigue and proprioceptive disruption.

Conclusions:

  • Acute central fatigue following eccentric exercise contributes to position sense disturbances.
  • Alterations in sensory processing related to central fatigue may underlie impaired proprioception.
  • While central fatigue resolves, peripheral fatigue and soreness persist, highlighting the complex recovery process.