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Reduced stretch-reflex sensitivity after exhausting stretch-shortening cycle exercise

C Nicol1, P V Komi, T Horita

  • 1Department of Biology of Physical Activity, University of Jyväskylä, Finland.

European Journal of Applied Physiology and Occupational Physiology
|January 1, 1996
PubMed
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Repeated high-intensity stretch-shortening cycle exercise impairs stretch reflexes and jump performance, with recovery linked to reduced muscle damage markers. This suggests decreased stretch-reflex sensitivity following fatigue and injury.

Area of Science:

  • Exercise Physiology
  • Sports Science
  • Neuromuscular Function

Background:

  • The stretch-shortening cycle (SSC) is crucial for natural muscle function but can cause damage with intense use.
  • Reduced impact tolerance may stem from diminished stretch-reflex potentiation.

Purpose of the Study:

  • To investigate how metabolic fatigue and muscle damage from SSC exercise affect stretch reflex efficacy.
  • To analyze electromyograph (EMG) responses in shank muscles (LG, SOL) to controlled stretches post-exercise.

Main Methods:

  • Subjects performed fatiguing SSC leg exercise, followed by repeated stretch reflex tests (EMG) and jump performance assessments.
  • Serum creatine kinase ([CK]), myoglobin, and lactate levels were monitored.
  • Measurements were taken immediately after exercise and at 2 hours, 2 days, and 4 days post-exercise.

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Main Results:

  • SSC exercise caused an immediate reduction in lateral gastrocnemius (LG) reflex amplitude, with delayed recovery.
  • Drop jump performance was significantly reduced for up to 2 days post-exercise.
  • Peak creatine kinase ([CK]) levels on day 2 indicated muscle damage, negatively correlating with jump height recovery.

Conclusions:

  • SSC-induced fatigue and muscle damage reduce stretch-reflex sensitivity.
  • Delayed recovery of reflex sensitivity may be linked to inflammation associated with muscle damage.
  • Findings highlight the impact of exercise-induced muscle damage on neuromuscular control and performance.