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Stepping over obstacles: attention demands and aging.

Clare Harley¹, Richard M Wilkie, John P Wann

¹Leeds Institute of Molecular Medicine, University of Leeds, UK.

|December 17, 2008

Summary

This summary is machine-generated.

Older adults experience greater risks when navigating obstacles during dual-task walking. Advanced age impairs cognitive function, negatively impacting gait stability and safety margins.

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Area of Science:

Gerontology
Biomechanics
Cognitive Neuroscience

Background:

Older adults frequently trip on obstacles, even when cautious.
Dual-task walking reveals age-related cognitive decline can affect postural control.
The impact of cognitive load on obstacle negotiation in aging is not fully understood.

Purpose of the Study:

To investigate age-related changes in obstacle crossing under dual-task conditions.
To examine how cognitive interference affects gait and postural management in older adults.
To compare obstacle negotiation strategies between young, middle-aged, and older adults.

Main Methods:

Forty-six healthy adults (20-79 years) performed obstacle crossing while walking and completing a verbal fluency task.
3D kinematic analysis was used to compare single-task and dual-task obstacle crossing.
Participants were divided into three age groups (20-29, 60-69, 70-79) to analyze age-related cognitive interference.

Main Results:

Younger and middle-aged adults showed altered stepping strategies and reduced gait variability during dual-tasking.
Older adults (70-79) exhibited reduced toe-obstacle clearance and increased gait variability during dual-task crossing.
The oldest group showed no significant change in verbal output, suggesting cognitive resources were prioritized for basic walking.

Conclusions:

Advanced age increases the detrimental impact of cognitive demands on motor performance, compromising safety.
Younger adults employ a posture-preserving strategy during complex tasks, which diminishes with advanced age.
Cognitive load significantly affects obstacle negotiation differently across age groups, highlighting age-related vulnerabilities.