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Carrying a weapon does not change stride-time variability during treadmill-based load carriage.

Patrick Slattery1, Jon Wheat2,3, L Eduardo Cofré Lizama1,4,5

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Weapon handling did not significantly alter stride time variability or regularity during load carriage tasks. This suggests weapon carriage may not be a critical factor in gait studies for soldiers.

Keywords:
DFAMilitaryarmybiomechanicsgait

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Area of Science:

  • Military science
  • Biomechanics
  • Human movement analysis

Background:

  • Gait biomechanics during load carriage is crucial for military performance and injury prevention.
  • The influence of weapon handling on gait during load carriage is not well understood.
  • Non-linear methods like detrended fluctuation analysis (DFA) and sample entropy (SE) offer insights into stride time dynamics.

Purpose of the Study:

  • To investigate the impact of weapon handling on gait biomechanics during load carriage.
  • To analyze non-linear stride time variability and regularity with and without a weapon.
  • To determine if weapon carriage affects gait dynamics in soldiers.

Main Methods:

  • Seventeen Australian Army soldiers participated in treadmill walking trials.
  • Participants carried a 23.2 kg load at three speeds (3.5, 5.5, 6.5 km/h) with and without a replica rifle.
  • Stride time variability and regularity were assessed using DFA and SE, with heel strike data from an 18-camera Vicon system.

Main Results:

  • Mixed-effect model analyses revealed no significant differences in stride time variability (DFA, p=0.46) with weapon handling.
  • No significant effect of weapon handling was observed on stride time regularity (SE, p=0.42).
  • These findings indicate weapon carriage does not substantially alter gait dynamics in this context.

Conclusions:

  • Weapon handling does not appear to be a significant factor influencing stride time variability or regularity during load carriage.
  • Future research on gait biomechanics during load carriage may not need to prioritize weapon carriage as a primary variable.
  • The study contributes to understanding the complex interplay of load, speed, and weapon carriage on soldier gait.