Cognitive and motor inhibition in balance-related tasks: task-specific associations with executive and physical functions in young and older adults.

This study investigates age-related differences in relations between inhibitory control in balance-related tasks (BRTs) and executive and physical functions. Correlations between effects of cognitive and motor inhibition in two BRTs and performance on general tests assessing inhibition and other executive functions, as well as associations between performance of the BRTs were explored in 26 young and 46 older adults (YA: 26 ± 4, OA: 70 ± 4 years). Multiple linear regression evaluated BRT-performance using predictors from general tests of executive and physical functions. Significant age-related differences were observed in most general tests. In YA, cognitive inhibition in the BRT correlated with reaction-time and failure-rate in Go/no-go and Stop-signal-tests, while motor inhibition showed a low non-significant correlation with stop-signal reaction-time in Stop-signal-test. These patterns were not observed in OA. In YA and OA, correlations between the BRTs were low and non-significant, and, executive functions, rather than physical functions, partly associated with BRT-performance. The differential associations of cognitive and motor inhibition in the BRTs with general inhibition tests and the lack of correlations between the BRTs supports the notion that the BRTs comprise different aspects of inhibitory control. The absence of similar results in OA may reflect compensatory processes and age-related changes in cognitive functions.