Negative effect of task complexity on the balance and mobility of healthy older adults

Abstract

Objective: to analyze the impact of task complexity on the mobility and balance of healthy older adults. Methods: ninety older adults were enrolled in the study. The participants performed tasks that simulated problems common to aging, such as low visual acuity, changes in the base of support and difficulties in carrying out activities simultaneously. Mobility was evaluated with the Timed Get Up and Go test during dual cognitive and motor tasks. Balance was assessed using a force plate with different bases of support and visual information. Cognitive tests were applied to characterize the sample and to analyze the association between the motor and cognitive variables. For statistical analysis, the Friedman test was used to verify the impact of task complexity on the older adults and the Spearman correlation coefficient was used to verify the association between the motor and cognitive variables. Significance was set at 5%. Results: task complexity impacted the mobility of participants, with a greater number of steps and time required to complete the test (p=0.001). Similarly, small bases of support and restricted visual information resulted in greater insecurity among the participants in terms of balance reactions (p=0.001). Correlation tests identified significant associations between executive functions and complex motor tasks (p<0.05). Conclusion: healthy older adults exhibited motor instability when performing complex tasks, potentiating aging-related changes. The association between the cognitive and motor variables suggests the need of multi-professional care to prepare older adults for their daily challenges.