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Effects of Rucksack Military Accessory on Gait Dynamic Stability.

Seong H Moon1, Christopher W Frames1, Rahul Soangra2,3

  • 1School of Biological and Health Systems Engineering, Arizona State University, Tempe, AZ,85281, USA.

International Journal of Prognostics and Health Management
|June 6, 2022
PubMed
Summary
This summary is machine-generated.

Soldiers experience reduced lower extremity dynamic stability when wearing rucksacks. This study found carrying equipment like the All-Purpose Lightweight Individual Carrying Equipment (ALICE) and Modular Lightweight Load Carrying Equipment (MOLLE) significantly impairs gait balance compared to normal walking.

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Area of Science:

  • Biomechanics
  • Military Medicine
  • Human Factors Engineering

Background:

  • Rucksack load carriage is a significant factor in U.S. Army soldier injuries.
  • Load carriage may negatively impact lower extremity stability and gait balance.
  • Understanding these effects is crucial for injury prevention and performance optimization.

Purpose of the Study:

  • To assess the impact of different rucksack types on gait and lower extremity dynamic stability.
  • To compare the stability during simulated marches with and without load carriage.
  • To quantify changes in dynamic stability using the Maximum Lyapunov Exponent (LyE).

Main Methods:

  • Five subjects performed simulated rucksack marches on a treadmill using the Motek GRAIL system.
  • Gait data was collected using the Dynaport Inertial Measurement Unit (IMU) system.
  • Trials included normal walking, walking with the ALICE rucksack, and walking with the MOLLE rucksack, each carrying 20kg for 200 seconds.

Main Results:

  • Normal walking exhibited significantly lower LyE (indicating greater stability) compared to walking with ALICE (P=0.000007) and MOLLE (P=0.00003).
  • No significant difference in LyE was found between ALICE and MOLLE rucksack conditions (P=0.441).
  • Subjects demonstrated significantly improved dynamic stability when not wearing a rucksack.

Conclusions:

  • Wearing a rucksack significantly reduces lower extremity dynamic stability in soldiers.
  • Both ALICE and MOLLE rucksack use lead to comparable reductions in dynamic stability.
  • Findings highlight the importance of load carriage management for maintaining soldier stability and preventing injuries.