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Joint kinetics and muscle activity while walking on ballast.

Chip Wade1, Mark S Redfern, Robert O Andres

  • 1Department of Industrial and Systems Engineering, Auburn University, 3301-G Shelby Center Auburn, AL 36849, USA. cwade1@auburn.edu

Human Factors
|December 29, 2010
PubMed
Summary

Walking on railroad ballast, a common work surface, increases muscle activation and alters gait biomechanics. This suggests ballast impacts joints and muscles, informing injury prevention strategies.

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Area of Science:

  • Biomechanics
  • Occupational Health
  • Ergonomics

Background:

  • Walking surface characteristics are linked to injury risk.
  • Ballast surfaces are prevalent in railroad and construction industries.
  • Limited research exists on ballast's effect on gait dynamics.

Purpose of the Study:

  • To investigate the impact of two common ballast sizes on gait biomechanics.
  • To simulate a railroad work environment to analyze gait kinetics and muscle activation.

Main Methods:

  • 20 healthy men walked on three surfaces: no ballast (NB), walking ballast (WB), and mainline ballast (MB).
  • WB and MB featured average rock sizes of 0.75-1 in. and 1.25-1.5 in.
  • Collected full-body motion, ground reaction forces, EMG signals, and calculated 3D joint moments.

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Main Results:

  • Significant variations in joint moments and EMG activity were observed across surfaces.
  • Joint moment ranges were smaller on ballast (MB, WB) compared to no ballast (NB).
  • EMG activity, particularly co-contraction, was significantly higher on ballast surfaces.

Conclusions:

  • Walking on ballast increases lower extremity joint muscle activation.
  • Ballast surfaces alter gait biomechanics, affecting muscles and joints.
  • Findings offer insights for improved work practices and injury prevention in railroad settings.