Postural, physiological and psychological reactions to challenging balance: does age make a difference?

Area of Science:

• Gerontology
• Human Physiology
• Psychology

Background:

• Balance control is crucial for preventing falls, especially in older adults.
• Psychological factors like anxiety and self-efficacy can significantly impact balance.
• Understanding the interplay between physiological and psychological factors in balance is essential for effective interventions.

Purpose of the Study:

• To investigate how increased balance challenge affects standing balance, state anxiety, and self-efficacy in young and older adults.
• To determine if changes in these factors correlate with alterations in standing balance.
• To compare the responses of young and older adults to varying levels of balance challenge.

Main Methods:

• A 2x2 factorial design comparing young and older adults across low and high support-surface heights.
• Measurements included forceplate-derived standing balance, state anxiety, blood pressure, and balance self-efficacy.
• Participants performed quiet standing trials under different surface conditions.

Main Results:

• Increased balance challenge (higher surface) significantly affected center of pressure displacements, anxiety, and self-efficacy in both age groups.
• Both young and older adults exhibited a 'stiffening strategy' (decreased amplitude, increased frequency) with higher surfaces.
• Physiological measures (blood pressure), state anxiety, and self-efficacy showed distinct correlations with postural control changes in each age group.

Conclusions:

• Older adults employ the same stiffening strategy as younger adults to manage increased anxiety and reduced confidence when facing greater balance challenges.
• Physiological status, state anxiety, and balance self-efficacy are linked to specific changes in postural performance under increased balance demand.
• Findings underscore the combined influence of psychological and physiological factors on clinical balance and suggest comprehensive rehabilitation approaches.