Changes in impaired physical function in older adults and the influences of physical activity: a population-based cohort study

Physical function declines with ageing; however, the changes in the prevalence of impaired physical function during ageing and how the changes would be affected by physical activity are not well investigated. This study aimed to address the issues. We included participants aged ≥ 65 years in the 2008–2010 wave, who were followed-up in the 2012–2014 and the 2016–2018 waves of the Health and Retirement Study. Types of impaired physical function included weak grip strength, slow walking speed, and poor standing balance. Their prevalence in each wave was calculated and their changes over time were estimated using the mixed-effects logistic regression model. A total of 6,537 older adults were included. The prevalence of slow walking speed ranked the highest in all the types of impaired physical function in all the 3 individual waves (all P comparison