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Related Experiment Video

Updated: May 15, 2025

Influence of Step-Width Manipulation on Running Biomechanics
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Published on: February 28, 2025

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Duty Factor Dominates Stride Frequency to Modify Musculoskeletal Peak Loading in Running.

Fiers Pieter, Gerlo Joeri1, Bonnaerens Senne1

  • 1Department of Movement and Sports Sciences, Ghent University, Ghent, BELGIUM.

Medicine and Science in Sports and Exercise
|April 8, 2025
PubMed
Summary

Adjusting running duty factor (contact time/stride time) significantly reduces musculoskeletal loading. Stride frequency’s effect on running load varies, but duty factor is the primary modulator of peak loading.

Keywords:
CADENCEMUSCULOSKELETAL LOADINGRUNNING PATTERNRUNNING STYLERUNNING-RELATED INJURIES

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Area of Science:

  • Biomechanics of running
  • Musculoskeletal loading analysis
  • Running injury prevention

Background:

  • Running style adjustments influence musculoskeletal loading and injury risk.
  • Duty factor and stride frequency are linked to peak running loads, but their specific roles are unclear.

Purpose of the Study:

  • To investigate the individual and combined effects of duty factor and stride frequency on peak musculoskeletal loading.
  • To understand how running pattern modifications impact loading at a constant, individualized speed.

Main Methods:

  • Nineteen novice female runners adjusted duty factor and/or stride frequency during treadmill running.
  • Ground reaction forces and motion capture data were collected.
  • Peak loading was assessed using inverse dynamics, analyzing forces and moments at lower limb joints.

Main Results:

  • Increased duty factor consistently decreased most peak loading metrics, except hip moments.
  • Stride frequency's impact on loading varied; it reduced knee/hip extensor moments but increased hip flexor moments.
  • When duty factor was controlled, stride frequency also influenced vertical ground reaction force and joint reaction forces, sometimes increasing peak loading.

Conclusions:

  • Duty factor is the primary determinant of running-related peak musculoskeletal loading.
  • Stride frequency's influence on peak loading is secondary and depends on individual factors and specific loading metrics.