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Timing accuracy in human throwing.

A G Chowdhary1, J H Challis

  • 1Applied Physiology Research Unit, The University of Birmingham, Birmingham, B15 2TT, U.K.

Journal of Theoretical Biology
|December 28, 1999
PubMed
Summary
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Achieving accurate over-arm throws requires precise muscle activation and projectile release timing. Simulations show that even small timing errors significantly impact accuracy, especially at longer distances.

Area of Science:

  • Biomechanics and Motor Control
  • Human Movement Science

Background:

  • Accurate projectile throwing relies on complex neuromuscular coordination.
  • Understanding the sensitivity of throwing accuracy to timing variations is crucial for performance optimization.

Purpose of the Study:

  • To determine the precise timing requirements for muscle activation and projectile release in over-arm throws.
  • To investigate the sensitivity of throwing accuracy to timing perturbations in simulated throws.

Main Methods:

  • Simulated over-arm throws using a muscle-actuated, two-segment model.
  • Investigated timing sensitivity by altering muscle activation and release times in simulations.
  • Analyzed the impact of timing variations on projectile accuracy for targets at 6 and 8 meters.

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Main Results:

  • Optimal throws at 8 meters required a 49 ms proximal-distal (PD) delay and 83.4 ms release time.
  • The 'launch window' for accuracy was as small as 1.2 ms at optimal timing.
  • A less sensitive timing scheme allowed for PD delay and release windows of 4 ms and 2.4 ms, respectively.

Conclusions:

  • Precise timing of muscle activations and projectile release is critical for accurate throwing.
  • The study quantifies the narrow timing tolerances necessary for optimal performance.
  • Findings have implications for sports science and rehabilitation strategies focused on motor control.