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Experimental Methods to Study Human Postural Control
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Compensations during Unsteady Locomotion.

Mu Qiao1, Devin L Jindrich2

  • 1*Kinesiology Program, School of Nutrition and Health Promotion, Arizona State University, Phoenix, AZ, USA; Department of Kinesiology, California State University, San Marcos, CA 92096, USA.

Integrative and Comparative Biology
|June 21, 2014
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Summary
This summary is machine-generated.

Animals use complex adjustments in leg and joint mechanics for unsteady locomotion. Humans show distinct stability strategies when walking versus running following perturbations.

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Area of Science:

  • Biomechanics
  • Locomotion Science
  • Animal Behavior

Background:

  • Unsteady locomotion (stability and maneuverability) in complex environments is poorly understood.
  • Existing models often simplify leg and joint mechanics, neglecting crucial parameters.

Purpose of the Study:

  • To investigate the mechanisms animals use to power and control unsteady locomotion.
  • To characterize human stability strategies following center-of-mass (COM) perturbations during walking and running.

Main Methods:

  • Behavioral, morphological, and impulsive perturbations were used.
  • Quasi-stiffness models analyzed leg and joint adjustments.
  • Direct-perturbation experiments assessed human stability during walking and running.

Main Results:

  • Leg and joint mechanics adjustments vary with step cycle phase and joint.
  • Human walking showed greater resistance to medio-lateral perturbations than running.
  • Recovery time from maximum COM displacement was similar for walking and running.

Conclusions:

  • Unsteady locomotion requires coupled translational and rotational control, exceeding simple models.
  • Humans employ distinct strategies for stability during walking and running.
  • Further research will elucidate behavioral, joint, and muscle-level compensation mechanisms.