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Related Experiment Videos

Evaluation of book backpack load during walking.

Y Wang1, D D Pascoe, W Weimar

  • 1Department of Physical Therapy, Georgia State University, Atlanta 30303, USA. ywang2@gsu.edu

Ergonomics
|September 19, 2001
PubMed
Summary
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Carrying a 15% body mass backpack load significantly alters walking mechanics, increasing impact forces during the double support phase and reducing them during the single support phase per stride.

Area of Science:

  • Biomechanics
  • Human Movement Analysis
  • Ergonomics

Background:

  • Backpack loads can affect gait parameters and impact forces.
  • Understanding these effects is crucial for preventing injuries, especially in college students who frequently carry heavy loads.

Purpose of the Study:

  • To evaluate the impact forces and mechanical stress during walking with different backpack loads and cadences.
  • To analyze forces during single and double support phases of the gait cycle.

Main Methods:

  • Thirty college students walked with an empty backpack and a backpack loaded to 15% of their body mass.
  • Both self-selected and fixed cadences were used.
  • Three-dimensional ground reaction forces and kinematic data were collected using force platforms and video analysis.

Related Experiment Videos

Main Results:

  • A 15% body mass load decreased walking speed, single support time, and increased double support time.
  • Impulses per stride increased during double support and decreased during single support.
  • The calculated stress index (impulses per metre) significantly increased during the double support phase.

Conclusions:

  • Carrying backpack loads significantly alters gait dynamics and increases mechanical stress, particularly during the double support phase.
  • The stress index provides a standardized measure of accumulative forces per metre, useful for assessing load-related stress over distance.