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Aging Effects on Limb Trajectory Control and Dynamic Balance During Obstacle Negotiation.

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    Summary
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    Older adults adapt cautiously to avoid tripping by increasing foot clearance over obstacles. However, this adaptation is coupled with reduced balance recovery capacity, increasing fall risk.

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    Area of Science:

    • Biomechanics
    • Gerontology
    • Human Movement Science

    Background:

    • Falls are a common problem, with tripping over obstacles being the primary cause.
    • Understanding how aging affects the ability to navigate obstacles is crucial for fall prevention strategies.

    Purpose of the Study:

    • To investigate the effects of aging on swing foot clearance and dynamic balance during obstacle negotiation.
    • To identify age-related changes in gait parameters related to obstacle crossing.

    Main Methods:

    • Thirty-four participants (15 young, 19 older adults) stepped over 4 cm, 8 cm, and 16 cm obstacles.
    • Measured foot-obstacle clearance, toe-obstacle distance, Margin of Stability (MOS), and Available Response Time (ART).
    • Analyzed data for dominant and non-dominant lead and trail limbs.

    Main Results:

    • Older adults showed increased toe clearance, especially in the non-dominant limb, as a protective measure.
    • Aging was associated with reduced MOS and ART during trail limb clearance, indicating impaired balance recovery.
    • Increased foot clearance in older adults suggests a cautious strategy, but reduced MOS and ART indicate potential stability issues.

    Conclusions:

    • Older adults employ cautious strategies (increased toe clearance) to mitigate tripping risk.
    • Aging impairs balance recovery mechanisms (reduced MOS and ART), potentially increasing fall risk despite cautious clearance.
    • Interventions should target both enhancing swing foot clearance and improving balance recovery to prevent falls in older adults.