Changing control strategies during standard assessment using computerized dynamic posturography with older women

Area of Science:

• Biomechanics
• Gerontology
• Signal Processing

Background:

• Computerized dynamic posturography (CDP) assesses balance control.
• Sensory Organization Test (SOT) evaluates sensory integration for postural stability.
• Understanding age-related changes in postural control is crucial for fall prevention.

Purpose of the Study:

• To investigate the utility of spectral analysis for interpreting CDP data.
• To determine if spectral analysis can reveal details about postural control strategies and learning in older adults.
• To examine changes in spectral properties during SOT conditions and across trials.

Main Methods:

• Twenty older women (60-72 years) underwent standard CDP testing.
• Data from SOT were analyzed using spectral analysis techniques.
• Equilibrium scores and frequency distribution shifts were compared across trials and conditions.

Main Results:

• Participants demonstrated significant improvements in equilibrium scores on more challenging SOT conditions between the first and second trials.
• Spectral analysis showed a discernible shift towards greater power in the lower frequency range, correlating with improved balance.
• This frequency shift suggests a modification in the reliance on the ankle strategy for maintaining balance.

Conclusions:

• Spectral analysis provides a valuable tool for elucidating postural control mechanisms during CDP.
• Older adults adapt their balance strategies, specifically increasing ankle strategy use, to improve stability in challenging sensory environments.
• These findings contribute to a deeper understanding of motor learning and adaptation in aging populations.