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Related Experiment Video

Updated: Aug 5, 2025

Sit-to-stand-and-walk from 120% Knee Height: A Novel Approach to Assess Dynamic Postural Control Independent of Lead-limb
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A novel method to quantify individual limb contributions to standing postural control.

James B Tracy1, Jocelyn F Hafer2, Thomas A Buckley2

  • 1Department of Kinesiology and Applied Physiology, University of Delaware, Newark, DE, USA; Department of Physical Medicine and Rehabilitation, University of Colorado Anschutz Medical Campus, Aurora, CO, USA.

Gait & Posture
|March 25, 2023
PubMed
Summary
This summary is machine-generated.

This study introduces a new method to quantify limb contributions to balance control during standing. Results show a wide range of limb contributions in healthy adults, not linked to dominance, offering insights for asymmetric function assessment.

Keywords:
BalanceCenter of PressureLateralityLimb DominancePostural Sway

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Area of Science:

  • Biomechanics
  • Neuroscience
  • Human Motor Control

Background:

  • Assessing individual limb contributions to postural control is crucial for understanding populations with asymmetric function, such as stroke survivors or amputees.
  • A novel method is proposed to quantify three distinct components of anteroposterior center of pressure (CoP) control during quiet standing: CoP motion under the left limb, under the right limb, and weight shifting between limbs.

Purpose of the Study:

  • To determine if these specific limb contributions to standing postural control can be accurately quantified from CoP trajectories in neurotypical adults.
  • To validate a new method for analyzing postural control by examining its application in a healthy population.

Main Methods:

  • Developed a method to calculate instantaneous and integrated limb contributions to CoP control, where contributions can range from negative to greater than one and sum to one.
  • Validated the method through proof-of-concept demonstrations involving restricted CoP motion.
  • Evaluated the method in 30 neurotypical young adults during 30-second eyes-open and eyes-closed bipedal standing trials.

Main Results:

  • Observed a wide range of limb contributions in neurotypical adults, irrespective of self-reported limb dominance or between-limb weight distribution.
  • With eyes open, mean left limb contribution was 0.52 (range 0.37-0.63) and right was 0.48 (0.31-0.63). With eyes closed, left was 0.51 (0.39-0.63) and right was 0.49 (0.37-0.61).
  • Weight-shift contributions were minimal (0.00 to 0.02) and no significant correlations were found between limb contributions, handedness, or weight distribution.

Conclusions:

  • The developed method quantifies a diverse range of limb contributions to postural control in neurotypical individuals, highlighting varied control strategies.
  • This tool can characterize CoP motion and underlying control mechanisms, enabling longitudinal tracking of functional changes in populations with asymmetric limb function, such as during rehabilitation or aging.