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Related Experiment Video

Updated: May 7, 2026

Oscillation and Reaction Board Techniques for Estimating Inertial Properties of a Below-knee Prosthesis
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Changes in intersegmental dynamics over time due to increased leg inertia.

Jeremy D Smith1, Samantha Villa, Gary D Heise

  • 1School of Sport & Exercise Science, University of Northern Colorado, Greeley, CO, United States.

Human Movement Science
|October 2, 2013
PubMed
Summary

Adding weight to one leg during walking alters joint dynamics, but the body adapts over time. The central nervous system adjusts joint moments to maintain a consistent walking pattern despite asymmetrical limb loading.

Keywords:
338040004010Inertial manipulationInertial momentIntersegmental dynamicsLower extremity loading

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Published on: April 18, 2011

Area of Science:

  • Biomechanics
  • Human locomotion
  • Motor control

Background:

  • Asymmetrical loading can affect gait patterns.
  • Understanding intersegmental dynamics is crucial for analyzing walking.
  • The central nervous system's adaptation to altered limb inertia is not fully understood.

Purpose of the Study:

  • To investigate the effects of asymmetrical limb loading on the intersegmental dynamics of the swing phase during walking.
  • To determine how the central nervous system adapts to changes in limb inertia.
  • To compare the adaptation strategies of the loaded and unloaded limbs.

Main Methods:

  • Participants walked on a treadmill under three conditions: unloaded, with a 2kg ankle load on the dominant limb, and post-load.
  • Sagittal plane motion data were collected for both legs.
  • Intersegmental dynamics analysis was performed on the swing phase of each leg.

Main Results:

  • Absolute angular impulses at the hip and knee of the loaded limb increased significantly with added weight and returned to baseline after load removal.
  • The unloaded limb's steady-state responses did not differ across conditions.
  • Both legs adapted to the altered limb inertia over approximately 40 strides to achieve a steady-state walking pattern.

Conclusions:

  • The central nervous system refines joint moments to compensate for altered limb inertia, maintaining the kinematic walking pattern.
  • Adaptation to asymmetrical loading results in altered moment profiles for the loaded limb but similar profiles for the unloaded limb compared to baseline.
  • The body demonstrates a capacity to adapt intersegmental dynamics to maintain stable locomotion under changing inertial conditions.