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Updated: Jun 26, 2026
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Experimental Methods to Study Human Postural Control
Published on: September 11, 2019
The effect of additional hand contact on postural stability perturbed by a moving environment
C J Hausbeck1, M J Strong, L S Tamkei
1Department of Physical Therapy, Central Michigan University, Mt. Pleasant, 48858, USA.
Gait & Posture
|January 27, 2009
Summary
Holding external objects, like canes, can improve balance when visual information conflicts with other senses. This simple hand contact enhances postural stability, reducing the risk of falls in visually challenging environments.
Area of Science:
- Biomechanics
- Human sensorimotor control
- Postural stability
Background:
- External hand contact can mitigate postural instability from sensory deficits.
- Its effect on stability with conflicting sensory information, specifically visual input, is less understood.
Purpose of the Study:
- To investigate how different types of hand contact affect postural stability when challenged by a moving visual scene.
- To determine if external support can counteract visual perturbations.
Main Methods:
- Eight healthy young adults stood on a rocker board for 1 minute, observing a simulated rocking ship.
- Participants experienced four conditions: no hand contact, holding a standard cane, touching a rocker cane, and touching a quad cane.
- Kinematic data were collected to compute center of mass (COM) displacement and joint angular displacements.
Main Results:
- A moving visual scene significantly perturbed body stability.
- All forms of additional hand contact with external supports reduced the destabilizing effects of the visual scene.
- Varying the stability of the support influenced the degree of stabilization.
Conclusions:
- External hand contact can enhance postural stability even when sensory systems are intact but provide conflicting information.
- Simple actions like holding an object can be beneficial for maintaining balance in environments with visual disturbances.
- Findings suggest practical applications for fall prevention strategies.
