Complexity of Daily Physical Activity Is More Sensitive Than Conventional Metrics to Assess Functional Change in Younger Older Adults.

The emerging mHealth applications incorporating wearable sensors enables continuous monitoring of physical activity PA This study aimed at analyzing the relevance of a multivariate complexity metric in assessment of functional change in younger older adults Thirty individuals 60 70 years old participated in a 4 week home based exercise intervention The Community Balance and Mobility Scale CBMS was used for clinical assessment of the participantsAndrsquo functional balance and mobility performance pre and post intervention Accelerometers worn on the low back were used to register PA of one week before and in the third week of the intervention Changes in conventional univariate PA metrics percentage of walking and sedentary time step counts mean cadence and complexity were compared to the change as measured by the CBMS Statistical analyses 21 participants showed significant rank correlation between the change as measured by complexity and CBMS Andrho 0 47 p 0 03 Smoothing the activity output improved the correlation Andrho 0 58 p 0 01 In contrast change in univariate PA metrics did not show correlations These findings demonstrate the high potential of the complexity metric being useful and more sensitive than conventional PA metrics for assessing functional changes in younger older adults