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Kinetic changes associated with load carriage using two rucksack designs.

R Lloyd1, C B Cooke

  • 1School of Sciences, University of Sunderland, Sunderland, UK. ray.lloyd@sunderland.ac.uk

Ergonomics
|October 3, 2000
PubMed
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Carrying heavy loads with a new rucksack design (AARN) showed a trend for shorter support time. This advanced rucksack also reduced propulsive force compared to traditional packs, indicating potential benefits for walking kinetics.

Area of Science:

  • Biomechanics
  • Human Movement Science
  • Ergonomics

Background:

  • Load carriage significantly impacts walking biomechanics.
  • Traditional rucksack designs may impose considerable kinetic demands.
  • Novel designs aim to optimize load distribution and reduce physiological strain.

Purpose of the Study:

  • To compare the walking kinetics between a traditional rucksack and a new design with front balance pockets (AARN).
  • To assess the effects of carrying a 25.6 kg load on ground reaction forces during walking.
  • To determine if the AARN rucksack offers biomechanical advantages over traditional designs.

Main Methods:

  • Nine subjects walked at a controlled speed (3 km/h) over a force plate.
  • Ground reaction forces (anteroposterior and vertical) were measured under unloaded and loaded conditions (25.6 kg).

Related Experiment Videos

  • Kinetic data were analyzed using repeated measures ANCOVA, with speed as a covariate.

    • Main Results:

    • A trend for shorter support time was observed with the AARN pack compared to the traditional pack (p=0.056).
    • Both rucksacks significantly increased braking and propulsive forces compared to unloaded walking.
    • The AARN pack resulted in significantly lower propulsive force (p<0.05) than the traditional rucksack.
    • Vertical ground reaction force peaks increased proportionally with system weight for both rucksacks.

    Conclusions:

    • The AARN rucksack design may offer advantages in reducing propulsive force demands during load carriage.
    • Front/back balance systems in rucksacks show potential for optimizing walking kinetics.
    • Further research is warranted to fully elucidate the biomechanical benefits of the AARN design.