Age-Related Differences in Cognitive and Postural Performance During Dynamic Dual-Tasks

Area of Science:

• Neuroscience
• Gerontology
• Biomechanics

Background:

• Age-related decline in balance and cognition increases fall risk and impacts quality of life.
• Existing dual-task research often uses static conditions or single cognitive tasks, limiting understanding of dynamic balance and cognitive interactions.
• Studying unimpaired adults establishes normative data for identifying pathological changes.

Purpose of the Study:

• To identify cognitive and motor outcomes most sensitive to age-related differences during dual tasks of varying complexity.
• To investigate these effects across static and dynamic balance conditions, considering minimal detectable change.
• To understand how cognitive demand interacts with postural control during standing and dynamic challenges.

Main Methods:

• Sixty healthy adults performed dual tasks with increasing cognitive complexity (Stroop Test) while standing on a robotic platform.
• Assessed cognitive performance (reaction time) and balance outcomes (trunk sway, center of pressure (CoP) sway area).
• Evaluated outcomes under static and dynamic balance conditions with varying dual-task demands.

Main Results:

• Reaction time showed age sensitivity, increasing with dual-task complexity.
• Age effects on balance were amplified during dynamic perturbations compared to static conditions.
• Center of pressure (CoP) sway area demonstrated significantly increased age sensitivity during dynamic tasks, exceeding minimal detectable change thresholds within a few years.

Conclusions:

• Complex motor-cognitive dual tasks are sensitive indicators of age-related changes in balance and cognition.
• Specific task-condition combinations can facilitate early detection and monitoring of age-related cognitive and balance decline.
• Trunk sway reflects cognitive load, while CoP sway is more sensitive to balance perturbations, offering distinct insights into aging processes.