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Related Experiment Videos

Changes in gait when anticipating slippery floors.

Rakié Cham1, Mark S Redfern

  • 1Room 153, Department of Bioengineering, Eye and Ear Institute Building, University of Pittsburgh, 203 Lothrop Street, Pittsburgh, PA 15213, USA. chamr@msx.upmc.edu

Gait & Posture
|March 1, 2002
PubMed
Summary

Anticipating slippery surfaces significantly alters gait biomechanics, reducing slip potential. Even when trying to walk naturally, individuals adapt their movements to minimize fall risks.

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Area of Science:

  • Biomechanics
  • Human Movement Science
  • Injury Prevention

Background:

  • Slips and falls are a major cause of injuries.
  • Understanding the biomechanics of slipping is crucial for prevention research.
  • Replicating the unpredictable nature of real-life slips in laboratory settings is challenging.

Purpose of the Study:

  • To quantify gait biomechanical changes when individuals anticipate slippery environments.
  • To investigate how uncertainty about surface conditions affects walking patterns.
  • To identify specific gait adaptations that reduce the risk of slipping.

Main Methods:

  • 16 subjects walked on level and inclined surfaces with varying friction.
  • Foot ground reaction forces and body dynamics were recorded.

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  • Gait biomechanics were compared across baseline, anticipation, and recovery trials.

    • Main Results:

    • Anticipation trials showed a 16-33% reduction in peak required coefficient of friction (RCOF(peak)) compared to baseline.
    • Recovery trials did not fully return RCOF(peak) to baseline levels (5-12% lower).
    • Significant gait adaptations included reduced stance duration, loading speed, normalized stride length, altered foot-ramp angle, and slower angular foot velocity.

    Conclusions:

    • Individuals make significant gait adjustments when anticipating slippery surfaces, even when asked to walk naturally.
    • These adaptations effectively reduce slip potential by lowering RCOF(peak).
    • The study provides insights into the specific mechanisms of gait adaptation for slip avoidance.