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Subject-specific Musculoskeletal Model for Studying Bone Strain During Dynamic Motion
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Is muscle coordination affected by loading condition in ballistic movements?

Caroline Giroux1, Gaël Guilhem2, Antoine Couturier2

  • 1French National Institute of Sport (INSEP), Research Department, Laboratory Sport, Expertise and Performance, Paris, France; CETAPS UPRES EA 3832, Faculty of Sports Sciences, University of Rouen, Mont Saint Aignan Cedex, France.

Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology
|December 4, 2014
PubMed
Summary

External load does not alter lower limb muscle coordination during ballistic squat jumps. The sequence and amplitude of muscle activation remain consistent across various loading conditions, highlighting intrinsic coordination patterns.

Keywords:
EMGForce platformForce–velocity relationshipSquat jump

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Area of Science:

  • Biomechanics
  • Exercise Physiology
  • Sports Science

Background:

  • Ballistic squat jumps are a key plyometric exercise.
  • Understanding muscle coordination under load is crucial for performance and injury prevention.

Purpose of the Study:

  • To investigate the impact of external loading on lower limb muscle coordination during ballistic squat jumps.
  • To analyze electromyographic (EMG) activity and muscle activation patterns under varying loads.

Main Methods:

  • Twenty athletes performed ballistic squat jumps with loads from 0-60% of their maximal repetition.
  • Vertical force, velocity, power, and EMG activity of lower limb muscles were recorded.
  • Muscle activation sequences and amplitudes were compared across different loading conditions.

Main Results:

  • Increased external load significantly increased vertical force but decreased movement velocity.
  • The sequence and amplitude of muscle activation (EMG) were not significantly affected by loading conditions.
  • Distinct roles and activation timings were observed for individual muscles (e.g., tibialis anterior, gluteus maximus, vastus lateralis).

Conclusions:

  • Muscle coordination patterns during ballistic squat jumps are robust and not significantly influenced by external load.
  • The intrinsic sequence and amplitude of muscle activation remain consistent, suggesting a stable neuromuscular strategy.