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An Instrumented Pull Test to Characterize Postural Responses
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Effects of backpack and double pack loads on postural stability.

Simon S W Li1, Otto H T Chan1, T Y Ng1

  • 1a Department of Health and Physical Education , The Education University of Hong Kong , Tai Po , Hong Kong.

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|November 29, 2018
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Summary

Carrying heavy loads on your back significantly impairs postural stability after walking. Distributing loads to the front and back, however, maintains better balance control.

Keywords:
Load distributionheavy load carriagepostural stabilitysensory organisation test

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Area of Science:

  • Biomechanics
  • Human Factors Engineering
  • Sports Science

Background:

  • Postural stability is vital for performance and injury prevention, especially during heavy load carriage.
  • Understanding how load distribution affects balance is critical for military, rescue, and recreational activities.

Purpose of the Study:

  • To investigate the impact of load distribution (backpack vs. double pack) on postural stability.
  • To assess changes in postural stability after a 10-minute walking exercise under various sensory conditions.

Main Methods:

  • 20 young adults participated in sensory organisation tests.
  • Tests were conducted before and after a 10-minute level walking exercise with heavy loads (30% body weight).
  • Load conditions included backpack (back-only) and double pack (front and back) carriage.

Main Results:

  • Postural stability significantly decreased after walking with a backpack load.
  • No significant changes in postural stability were observed with double pack loads.
  • Impaired somatosensory, visual, and vestibular conditions were tested.

Conclusions:

  • Distributing heavy loads to both the front and back (double pack) offers superior balance control compared to back-only carriage.
  • Backpack carriage negatively impacts postural stability, particularly after physical exertion.
  • Load distribution strategies are crucial for maintaining balance and preventing injuries in load-carrying tasks.