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A simple model for predicting walking energetics with elastically-suspended backpack.

Dejun Li1, Tong Li1, Qingguo Li2

  • 1State Key Laboratory of Fluid Power and Mechatronic Systems, College of Mech. Eng., Zhejiang University, 310027 Hangzhou, China.

Journal of Biomechanics
|November 10, 2016
PubMed
Summary

Elastically-suspended backpacks can reduce injury risk. This study quantifies how suspension affects walking energy cost, finding increased cost near resonant frequencies, especially at higher speeds or loads.

Keywords:
BackpackElasticityEnergeticsLoad carriageWalking

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Area of Science:

  • Biomechanics
  • Human Energetics
  • Wearable Systems

Background:

  • Elastically-suspended backpacks reduce injury risk by lowering joint loads.
  • The effect of elastic suspension on metabolic cost during walking is not well understood.
  • Existing methods lack quantitative evaluation of suspension elasticity's impact on human energetics.

Purpose of the Study:

  • To quantitatively evaluate the effect of backpack suspension stiffness and damping on human walking energetics.
  • To propose and utilize a surrogate for metabolic cost to estimate energy expenditure differences.
  • To provide a more precise energetic estimation model for backpack carrying.

Main Methods:

  • Employed a single degree of freedom (DOF) model to simulate backpack dynamics.
  • Utilized a surrogate metabolic cost to compare energetics between different backpack stiffness levels.
  • Analyzed the relationship between suspension natural frequency and walking frequency.

Main Results:

  • Energy cost increases when the suspension's natural frequency approaches the walking frequency (resonance).
  • The energetic difference between elastic and stiff suspensions becomes more significant at higher walking speeds and heavier loads.
  • The proposed model provides a closer energetic estimation compared to previous studies.

Conclusions:

  • Backpack suspension elasticity significantly influences human walking energetics.
  • Resonance in the suspension system leads to increased metabolic cost.
  • Future models should incorporate horizontal motion for more accurate predictions of energy differences.