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Muscle-contraction properties in overarm throwing movements.

Apostolos K Grezios1, Ioannis Th Gissis, Aristomenis A Sotiropoulos

  • 1Laboratory of Biomechanics, Department of Physical Education and Sport Sciences, Aristotelian University of Thessaloniki, Thessaloniki, Greece. agkrez@pe.uth.gr

Journal of Strength and Conditioning Research
|March 1, 2006
PubMed
Summary

Unloaded overarm throws utilize the stretch-shortening cycle (SSC) for muscle contraction. Increasing initial movement velocity enhances throw velocity by leveraging higher inertia forces.

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Area of Science:

  • Biomechanics
  • Human Movement Science
  • Sports Science

Background:

  • Understanding muscle contraction types is crucial for optimizing athletic performance.
  • Overarm throwing movements, common in sports, involve complex biomechanical actions.
  • The role of the stretch-shortening cycle in unloaded throws requires further elucidation.

Purpose of the Study:

  • To identify the specific type of muscle contraction during unloaded overarm throwing.
  • To investigate the relationship between initial movement velocity and throw performance.
  • To determine the influence of training status on throwing biomechanics.

Main Methods:

  • Utilized dynamic and kinematic data from an arm-force-measuring apparatus simulating overarm throws.
  • Measured parameters included initial velocity, release velocity, early concentric velocity, deceleration force, and eccentric/concentric impulse.

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  • Compared data across three groups: untrained, weight-trained athletes, and team handball players.

    • Main Results:

    • Statistically significant correlations (p < 0.001) were found between initial movement phase parameters, particularly within the first 50 milliseconds.
    • Higher initial movement speed correlated with significantly higher measured parameters (p < 0.05).
    • The stretch-shortening cycle was identified as the primary muscle contraction mechanism.

    Conclusions:

    • The stretch-shortening cycle is the predominant muscle contraction type in unloaded overarm throws.
    • Enhancing initial movement velocity is a key strategy for increasing overall throw velocity.
    • Training status influences biomechanical parameters, highlighting the importance of specific training regimens.