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Related Experiment Video

Updated: Oct 19, 2025

Asymmetric Walkway: A Novel Behavioral Assay for Studying Asymmetric Locomotion
08:19

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Strides to Achieve a Stable Symmetry Index During Running.

Shane P Murphy, Zach B Barrons, Jeremy D Smith

    Journal of Sport Rehabilitation
    |September 26, 2021
    PubMed
    Summary

    Determining limb symmetry in running requires a minimum of 15 strides for stable measures. This finding supports efficient gait analysis for lower-extremity injury rehabilitation, ensuring reliable data without excessive testing.

    Keywords:
    biomechanicsgait analysiskinematicskineticsspatiotemporal parameters

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    Area of Science:

    • Biomechanics
    • Sports Medicine
    • Rehabilitation Science

    Background:

    • Limb pattern symmetry is crucial for assessing running mechanics and guiding lower-extremity injury rehabilitation.
    • Efficient gait analysis requires stable measures without demanding excessive running strides.

    Purpose of the Study:

    • To determine the minimum number of running strides needed to establish a stable mean symmetry index (SMSI).
    • To compare symmetry indices derived from random versus consecutive strides.

    Main Methods:

    • A sequential averaging method was employed to identify the number of strides for a stable SMSI within a 60-second trial.
    • Analysis of variance (ANOVA) was used to compare differences between stride bins and symmetry calculations.

    Main Results:

    • A stable SMSI was achieved with a median of 15 strides across all biomechanical variables.
    • No significant differences were found between consecutive and random stride sets of 15 strides.
    • While symmetry calculation values differed significantly for most variables, the number of strides for stability did not show systematic differences.

    Conclusions:

    • Fifteen strides are sufficient to achieve a stable SMSI in running gait analysis.
    • Clinicians and researchers should consider this minimum stride count when evaluating interlimb symmetry for injury assessment and rehabilitation.