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Related Experiment Video

Updated: Jun 4, 2026

Sit-to-stand-and-walk from 120% Knee Height: A Novel Approach to Assess Dynamic Postural Control Independent of Lead-limb

Sit-to-stand-and-walk from 120% Knee Height: A Novel Approach to Assess Dynamic Postural Control Independent of Lead-limb

Published on: August 30, 2016

Estimating functional stability boundaries for bipedal stance.

Katharine E Forth¹, Matthew J Fiedler, William H Paloski

¹Universities Space Research Association, Houston, TX, USA.

|February 1, 2011

Summary

This summary is machine-generated.

This study introduces a new method to measure functional limits of stability (LOS) during walking. These functional stability limits are closer to the body

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Last Updated: Jun 4, 2026

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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Experimental Methods to Study Human Postural Control

Experimental Methods to Study Human Postural Control

Published on: September 11, 2019

Area of Science:

Biomechanics
Human Movement Science
Kinesiology

Background:

Assessing limits of stability (LOS) is crucial for understanding balance and fall risk.
Traditional methods often rely on anatomical boundaries, which may not accurately reflect functional capabilities.
Bipedal stance stability is a key area of research in human movement.

Purpose of the Study:

To propose and validate a novel technique for estimating functional limits of stability (LOS) during bipedal stance.
To compare these functional LOS with traditional anatomical boundaries.
To investigate the effect of visual input on functional LOS.

Main Methods:

A controlled, low-speed voluntary leaning protocol was used with participants maintaining ground contact.
Ellipses were fitted to center-of-mass (CoM) position data to estimate LOS.
Measurements were taken with eyes open and eyes closed.

Main Results:

Functional limits of stability (LOS) were successfully estimated using the proposed method.
The estimated functional LOS were 20-59% closer to the center of stance compared to anatomical boundaries.
Closing the eyes significantly reduced the functional LOS.

Conclusions:

Functional stability boundaries provide a more accurate representation of a person's actual stability limits than anatomical ones.
The proposed method offers a practical approach to assess functional LOS relevant to fall risk.
Visual input plays a significant role in maintaining functional stability during bipedal stance.