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When the neuron of a motor unit fires an action potential, it triggers a series of events, leading to a twitch contraction in the muscle fibers. The process of excitation-contraction coupling is crucial in relaying the action potential to the muscle fibers.
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Related Experiment Video

Updated: Apr 15, 2026

Construction of Constant-Load (Isotonic) and Constant-Velocity (Isokinetic) Torque-Velocity-Power Profiles In vivo for the Rat Plantar Flexors
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Force-velocity Relationship of Muscles Performing Multi-joint Maximum Performance Tasks.

S Jaric1

  • 1Department of Kinesiology and Applied Physiology & Biomechanics and Movement Science Graduate Program, University of Delaware, Newark, United States.

International Journal of Sports Medicine
|March 26, 2015
PubMed
Summary
This summary is machine-generated.

The force-velocity relationship in multi-joint movements is often linear, simplifying muscle mechanical modeling. This linear model offers practical applications for assessing neuromuscular system capacity.

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Area of Science:

  • Biomechanics
  • Human Physiology
  • Sports Science

Background:

  • Muscle mechanical characteristics are typically modeled using force, velocity, and power data from external load manipulation.
  • The force-velocity relationship in isolated muscle groups is commonly described by a hyperbolic equation.

Purpose of the Study:

  • To review evidence on the nature of the force-velocity relationship in maximum-performance multi-joint movements.
  • To explore the implications of this relationship for modeling the human muscular system and its practical applications.

Main Methods:

  • Review of existing scientific literature on force-velocity relationships in human movement.
  • Analysis of data from studies involving maximum-performance multi-joint tasks.

Main Results:

  • The force-velocity relationship in multi-joint movements is approximately linear, unlike the hyperbolic relationship in isolated muscles.
  • This linearity simplifies the power-velocity relationship, making it parabolic.
  • Parameters derived from the linear model (maximum force, velocity, power) are reliable and sensitive for differentiating physical abilities.

Conclusions:

  • A linear force-velocity relationship and parabolic power-velocity relationship offer a simplified approach to studying and modeling the human muscular system.
  • Loaded multi-joint movements can serve as routine tests for evaluating neuromuscular force-, velocity-, and power-generating capacity.