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Related Experiment Video

Updated: Jun 7, 2026

Comparative Analysis of Lower Limb Kinematics between the Initial and Terminal Phase of 5km Treadmill Running
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Published on: July 17, 2020

Running injury and stride time variability over a prolonged run.

Stacey A Meardon1, Joseph Hamill, Timothy R Derrick

  • 1Department of Health Professions, Physical Therapy Program, University of La Crosse-Wisconsin, 1725 State Street, 4054 Health Sciences Center, La Crosse, WI 54601, USA. meardon.stac@uwlax.edu

Gait & Posture
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Summary

Running stride times become more unpredictable with fatigue. Previous injury also reduces stride time predictability, suggesting altered neuromuscular control in runners.

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Area of Science:

  • Biomechanics
  • Human movement analysis
  • Sports science

Background:

  • Locomotor variability is a natural aspect of movement.
  • Healthy movement exhibits predictable structures in variability.
  • Understanding variability changes is key to analyzing running mechanics.

Purpose of the Study:

  • Quantify the structure of locomotion variability using detrended fluctuation analysis (DFA).
  • Examine the influence of running-induced fatigue and prior injury on stride time variability.
  • Investigate changes in long-range correlations (α) during a fatiguing run.

Main Methods:

  • Attached accelerometers to the tibias of 18 runners to record stride time.
  • Measured stride time variability using DFA to calculate long-range correlations (α).
  • Analyzed stride time data across three intervals (beginning, middle, end) of a fatiguing run, comparing injured and non-injured groups.

Main Results:

  • Stride time variability (mean, SD, CV) did not significantly change with fatigue or between groups.
  • A significant linear trend showed a decrease in α over the run, indicating increased stride time unpredictability.
  • Runners with a history of injury exhibited significantly lower α compared to non-injured runners.

Conclusions:

  • Fatigue leads to more unpredictable stride timing during running.
  • Previous injury is associated with reduced stride time complexity (lower α).
  • Both fatigue and injury appear to influence neuromuscular control during running.