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How many strides are needed for reliable markerless gait analysis?

Andreia Carvalho1, Jos Vanrenterghem2, Todd C Pataky3

  • 1LBMF, CIPER, Faculdade de Motricidade Humana, Universidade Lisboa, Lisboa P-1499-002, Portugal; Musculoskeletal Rehabilitation Research Group, Faculty of Movement and Rehabilitation Sciences, Leuven KU, Belgium; Escola Superior de Saúde de Lisboa, Instituto Politécnico de Lisboa, Lisboa 1990-096, Portugal.

Gait & Posture
|October 24, 2025
PubMed
Summary
This summary is machine-generated.

Markerless motion capture for older adults requires at least 7 strides for reliable gait analysis. This finding is crucial for populations with limited assessment tolerance, optimizing data collection strategies.

Keywords:
BiomechanicsIntraclass Correlation CoefficientOlder adultsStandard Error of MeasurementTest-retest

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Area of Science:

  • Biomechanics
  • Gait Analysis
  • Motion Capture Technology

Background:

  • Markerless motion capture is an emerging technology for gait analysis.
  • Traditional methods pose challenges for older adults, including limited assessment tolerance and stride count.
  • Investigating the impact of stride number on reliability is crucial for this population.

Purpose of the Study:

  • To determine the minimum number of strides needed for reliable markerless gait biomechanics in older adults.
  • To assess the influence of stride count on test-retest reliability and measurement error.
  • To establish optimal data collection strategies for this demographic.

Main Methods:

  • Twenty strides were analyzed from 29 older adults across two sessions.
  • Lower-limb kinematics and kinetics were calculated.
  • Subsets of 2-19 strides were averaged, with varying numbers between sessions, to compute reliability metrics (iICC, SEM).

Main Results:

  • A minimum of 7 strides achieved reliable gait analysis (iICC ≥ 0.75) with less than 10% drop from maximum reliability.
  • Kinematic Standard Errors of Measurement (SEM) generally stayed below 2 degrees.
  • Four strides were sufficient for kinetics SEM below 5%.

Conclusions:

  • Seven strides are generally adequate for reliable markerless kinematics and kinetics in older adults.
  • These findings are particularly relevant for populations with limited assessment tolerance.
  • Flexible stride number collection across sessions enhances data collection efficiency while maintaining reliability.