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Coordination in vertical jumping.

M F Bobbert1, G J van Ingen Schenau

  • 1Department of Functional Anatomy, Faculty of Human Movement Sciences, Free University of Amsterdam, The Netherlands.

Journal of Biomechanics
|January 1, 1988
PubMed
Summary
This summary is machine-generated.

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This study reveals how muscle activation sequences in vertical jumping maximize jump height. Specific muscle firing patterns optimize energy transfer for peak performance in skilled jumpers.

Area of Science:

  • Biomechanics
  • Human Movement Science
  • Sports Physiology

Background:

  • Vertical jumping performance is influenced by complex interactions between muscle activity and movement mechanics.
  • Understanding the precise timing and sequence of muscle activation is crucial for optimizing jumping technique.

Purpose of the Study:

  • To investigate the relationship between muscle activation patterns, movement kinematics, and jumping achievement in skilled vertical jumpers.
  • To determine how muscle firing sequences contribute to maximizing the effective energy of the body's center of mass during the push-off phase.

Main Methods:

  • Recorded ground reaction forces and cinematographic data from ten skilled jumpers performing countermovement jumps.
  • Measured myoelectric activity (EMG) from seven leg muscles, processing signals to reflect muscle activation levels.

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  • Analyzed the sequence of muscle activation and its correlation with biomechanical parameters related to jump height.

    • Main Results:

    • Identified a specific sequence of muscle activation, starting with the semitendinosus and progressing through other leg muscles to the gastrocnemius.
    • Demonstrated that this muscle activation sequence correlates with the maximization of effective energy (Ey) of the mass center of the body (MCB).
    • Highlighted the role of monoarticular and biarticular muscles in releasing and transferring energy for optimal jump performance.

    Conclusions:

    • The observed muscle activation sequence is critical for maximizing vertical jump height by optimizing energy release and transfer.
    • Efficient energy transport via biarticular muscles (rectus femoris, gastrocnemius) is essential for maximizing the effective energy of the mass center of the body.
    • Coordinated muscle activation patterns enable the sequential peaking of velocity differences across body segments, enhancing jump performance.