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Background: Older adults (those over 70 years [y])(OAs) are the fastest growing, most infirm and least active population group. This group attracts the highest health and social care costs of any sector. Moderate-to-vigorous physical activity (MVPA) can attenuate this cost by bringing a variety of health benefits to OAs. However, little is known about OAs’ daily MVPA and whether certain behavioural characteristics are associated with lower MVPA levels. To date, research has focused on cross-sectional designs and defining correlates based on self-reported physical activity (PA). Such measures tend to overestimate MVPA. Accelerometry provides more objective measures that can be reliably repeated.

Purpose: To investigate the associations between sociodemographic, participant characteristics (eg physical function) and behavioural (eg trips out of the house [trips· wk-1]) variables on changes in OAs’ daily MVPA …