Age and Visual Contribution Effects on Postural Control Assessed by Principal Component Analysis of Kinematic Marker...

Area of Science:

• Biomechanics
• Human Movement Science
• Gerontology

Background:

• Postural control is vital for health and daily function.
• Aging and visual input are known factors influencing balance.
• Understanding age-related changes in postural control is crucial.

Purpose of the Study:

• To investigate the effects of age and visual input on postural control.
• To analyze age-related differences in movement synergies during balancing tasks.

Main Methods:

• Principal Component Analysis (PCA) was used to identify principal movements (PMs) from kinematic data.
• Data were collected from young and older adults balancing on stable and unstable surfaces with eyes open and closed.
• PCA-derived variables (PP_rVAR, PA_rVAR, PA_RMS) quantified movement composition and neuromuscular control magnitude.

Main Results:

• Older adults showed significantly greater PA1_rVAR and PA1_RMS compared to young adults.
• Eyes-closed conditions resulted in significantly higher PA1_rVAR and PA1_RMS than eyes-open.
• These effects were most prominent in PM1, related to anteroposterior ankle sway.

Conclusions:

• Older adults require greater neuromuscular control for postural stability, particularly when visual input is reduced.
• Reduced visual reliance exacerbates the need for enhanced neuromuscular control in older adults.
• Age and visual contribution are key determinants of postural control strategies.