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Calf muscle strength in humans.

S W Trappe1, T A Trappe, G A Lee

  • 1Human Performance Laboratory, Ball State University, Muncie, IN 47306, USA. strappe@bsu.edu

International Journal of Sports Medicine
|May 17, 2001
PubMed
Summary

This study developed a reliable torque velocity device (TVD) to measure calf muscle strength. Calf muscle strength is positively correlated with muscle size, but not fiber type, indicating TVD

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Area of Science:

  • Biomechanics
  • Human Physiology
  • Sports Science

Background:

  • Accurate measurement of calf muscle strength is crucial for understanding performance and injury.
  • Existing methods may lack reliability or comprehensive assessment capabilities.
  • The torque velocity device (TVD) was developed to address these limitations.

Purpose of the Study:

  • To assess the reliability and reproducibility of a novel torque velocity device (TVD) for measuring calf muscle strength.
  • To investigate the relationship between calf muscle strength, morphology (size, fiber type), and contractile velocity.
  • To establish normative strength and morphological data for the calf muscles.

Main Methods:

  • 18 subjects underwent strength testing using a custom-built TVD, measuring isometric force, peak torque across various angular velocities, and fatigue resistance.
  • Magnetic Resonance Imaging (MRI) and muscle biopsies were performed to assess muscle size and fiber type composition (gastrocnemius and soleus).
  • Statistical analyses were conducted to determine correlations between strength, morphology, and reliability metrics (coefficient of variation).

Main Results:

  • The greatest isometric force production was observed at 80 degrees of plantar flexion (148.5 +/- 40.2 Nm).
  • Isokinetic force production decreased significantly with increasing angular velocity, ranging from 114.1 Nm at 0.52 rad/s to 16.8 Nm at 5.24 rad/s.
  • A strong positive correlation was found between calf muscle strength and muscle size (r=0.76, p<0.05), but not with muscle fiber type (r=0.38, p>0.05).
  • The TVD demonstrated high reliability and reproducibility, with within-subject coefficients of variation between 1.9% and 7.4%.

Conclusions:

  • The torque velocity device (TVD) provides a reliable and reproducible method for assessing calf muscle strength.
  • Calf muscle strength is significantly influenced by muscle size rather than muscle fiber type composition.
  • These findings contribute to a better understanding of calf muscle function and provide a valuable tool for research and clinical applications.

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