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Accuracy of Voluntary Force Modulation During the Isometric Mid-Thigh Pull.

S Alexander Long1, Olivia Vadas1, Stephanie Balint2

  • 1Department of Physical Therapy and Human Movement Science, Sacred Heart University, Fairfield, CT 06825, USA.

Sports (Basel, Switzerland)
|February 26, 2026
PubMed
Summary

Individuals show force modulation errors during isometric mid-thigh pulls, especially at lower intensities. Biological sex and relative strength do not significantly impact this force modulation accuracy.

Keywords:
anchorcontrolmuscleprecisionstrengthtechnical

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Area of Science:

  • Biomechanics
  • Human Movement Science
  • Strength and Conditioning

Background:

  • Accurate force production is crucial for athletic performance and rehabilitation.
  • Understanding factors influencing force modulation accuracy, such as sex and strength, is important for training.
  • The isometric mid-thigh pull (IMTP) is a common measure of maximal strength.

Purpose of the Study:

  • To assess voluntary force modulation accuracy during the IMTP.
  • To determine if biological sex influences force modulation error.
  • To investigate the relationship between relative strength and force modulation error.

Main Methods:

  • 18 strength-trained males and 18 females performed ascending and descending submaximal IMTP tests without feedback.
  • Intended (INT) and measured forces were compared using ANOVAs.
  • Independent t-tests and Pearson correlations examined sex and relative strength differences in error.

Main Results:

  • Significant differences existed between intended and measured forces across all intensities (p < 0.05).
  • No significant differences in force modulation error were found between males and females (p > 0.05).
  • Small, non-significant correlations were observed between relative strength and error (p > 0.05).

Conclusions:

  • Force modulation accuracy during IMTP is imperfect, with greater error at lower relative intensities.
  • Biological sex and relative strength do not appear to be significant factors affecting force modulation accuracy in this population.