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An In Vitro Adult Mouse Muscle-nerve Preparation for Studying the Firing Properties of Muscle Afferents
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Human capacity for explosive force production: neural and contractile determinants.

J P Folland1, M W Buckthorpe, R Hannah

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Summary

This study reveals that neural and contractile factors significantly influence explosive knee extension force. Key determinants of this force production evolve throughout the contraction phase.

Keywords:
contractile propertiesexplosive strengthneural drive

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Area of Science:

  • Human movement science
  • Neuromuscular physiology
  • Biomechanics

Background:

  • Explosive force production is crucial for athletic performance.
  • Understanding the interplay between neural and contractile elements is key to optimizing power output.
  • Significant interindividual variability exists in explosive force generation.

Purpose of the Study:

  • To identify the neural and contractile determinants of explosive knee extension force.
  • To analyze how these determinants change during the force-production phase.
  • To explain the substantial interindividual variability in explosive force.

Main Methods:

  • Forty untrained participants performed voluntary and involuntary (twitch, octet) isometric knee extension contractions.
  • Measured explosive force (F0-150 ms) and rate of force development (RFD) in 50-ms epochs.
  • Recorded and normalized surface electromyography (EMG) of quadriceps and hamstrings, alongside maximum voluntary force (MVF).

Main Results:

  • Multiple regression models explained 59-93% (absolute) and 35-60% (relative) of the variance in explosive force.
  • Early force production (F0-50 ms) depended on quadriceps EMG and twitch force.
  • Later force development (RFD50-100 ms, F100-150 ms) was influenced by octet RFD and MVF, respectively.

Conclusions:

  • Explosive knee extension force is significantly determined by neural and contractile variables.
  • The specific neural and contractile contributors to explosive force change dynamically during the contraction.
  • These findings highlight the complex, time-dependent nature of neuromuscular control in explosive movements.