The relationship of postural sway to sensorimotor function, functional performance, and disability in the elderly

Area of Science:

• Gerontology
• Biomechanics
• Rehabilitation Science

Background:

• Postural sway is a key indicator of balance and stability.
• Age-related sensorimotor impairments can significantly affect balance control.
• Understanding the interplay between sway, function, and disability is crucial for elderly fall prevention.

Purpose of the Study:

• To investigate the relationship between postural sway and sensorimotor function in community-dwelling elderly individuals.
• To determine how postural sway relates to functional performance and self-reported disability.
• To clarify whether postural sway primarily reflects sensorimotor deficits or functional limitations.

Main Methods:

• A cross-sectional cohort study was conducted with 100 elderly individuals unable to climb stairs step-over-step.
• Measurements included postural sway (eyes open/closed), sensorimotor function (strength, sensation, etc.), functional performance (gait, reach, etc.), and disability (MOS-SF36, Falls Efficacy Scale [FES]).

Main Results:

• Postural sway, particularly with eyes closed, correlated with sensorimotor deficits, including sensory deficits and increased tibialis anterior latency.
• Increased sway area was associated with greater strength, possibly due to compensatory stability strategies in weaker individuals.
• Postural sway did not significantly correlate with most functional performance measures but was linked to FES scores, indicating a relationship with perceived fall risk.

Conclusions:

• Postural sway measures in this elderly cohort primarily reflect underlying sensorimotor impairments rather than functional performance capabilities.
• The association between postural sway and self-reported disability is inconsistent and warrants further investigation.
• Eyes-closed postural sway significantly predicted fall efficacy scores when controlling for functional measures.