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Related Experiment Videos

Post-contraction errors in human force production are reduced by muscle stretch.

R S Hutton1, K Kaiya, S Suzuki

  • 1Department of Psychology, University of Washington, Seattle 98195.

The Journal of Physiology
|December 1, 1987
PubMed
Summary

Previous muscle contractions, even at low forces, impair accurate force reproduction. This effect, a positive bias, lessens over time but persists after muscle stretching, suggesting neural factors influence muscle force control.

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Area of Science:

  • Neuromuscular Physiology
  • Motor Control
  • Skeletal Muscle Function

Background:

  • Previous research indicated conditioning contractions affect force reproduction accuracy.
  • Understanding these effects is crucial for motor control and rehabilitation.

Purpose of the Study:

  • To investigate the impact of varying intensities of elbow flexor conditioning contractions on the accuracy of reproducing a low-level criterion muscle force.
  • To examine the influence of muscle stretch on post-contraction force reproduction errors.

Main Methods:

  • Subjects performed conditioning contractions at 25%, 50%, or 100% of maximum voluntary contraction (MVC).
  • Following conditioning, subjects attempted to reproduce a learned 2% MVC criterion force without visual feedback.
  • A brief muscle stretch was applied before some criterion force attempts.

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Main Results:

  • Conditioning contractions at all tested intensities introduced significant positive bias errors in force reproduction.
  • The magnitude of the error correlated with the intensity of the conditioning contraction.
  • Errors decayed over approximately 35 seconds, and muscle stretching partially reduced but did not eliminate the bias.

Conclusions:

  • Post-contraction potentiation of stretch reflex pathways likely contributes to force reproduction errors.
  • Residual errors suggest central or peripheral neural factors, including potentiation effects on submaximal tension, influence motor output after prior activation.