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Neuromuscular control following maximal eccentric exercise

M P Miles1, J C Ives, K R Vincent

  • 1Department of Exercise Science, University of Massachusetts, Amherst 01003, USA.

European Journal of Applied Physiology and Occupational Physiology
|January 1, 1997
PubMed
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High-force eccentric exercise prolonged neuromuscular control changes in elbow flexion for up to 5 days. This was due to exercise-induced skeletal muscle disruption, affecting kinematic and electromyographic (EMG) parameters.

Area of Science:

  • Neuromuscular Physiology
  • Exercise Science
  • Biomechanics

Background:

  • Eccentric exercise, involving muscle lengthening under load, is known to induce muscle damage.
  • Understanding the impact of high-force eccentric exercise on neuromuscular control is crucial for training and rehabilitation.

Purpose of the Study:

  • To investigate the effects of high-force eccentric exercise on the neuromuscular control of elbow flexion.
  • To analyze kinematic and electromyographic (EMG) changes following a bout of maximal velocity eccentric contractions.

Main Methods:

  • Ten non-weight-trained females performed 50 maximal velocity elbow flexion movements.
  • Kinematic and triphasic EMG parameters were measured pre-exercise and up to 5 days post-exercise.
  • Serum creatine kinase (CK) activity was assessed to quantify muscle damage.

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Main Results:

  • Eccentric exercise significantly lengthened kinematic parameters (movement time, time to peak velocity).
  • Electromyographic (EMG) parameters, including motor time and burst durations, were prolonged post-exercise.
  • These neuromuscular changes persisted for up to 5 days, correlating with increased serum CK activity.

Conclusions:

  • High-force eccentric exercise induces prolonged alterations in neuromuscular control.
  • Exercise-induced skeletal muscle disruption is a primary factor affecting motor control.
  • The central motor program compensates by systematically lengthening components of the triphasic EMG pattern.