Background
We investigated the association between 10-years of change in physical activity levels and 7-year all-cause mortality.
Methods
Mexican-American adults aged 67 and older (N=803) participating in the Hispanic Established Population for the Epidemiologic Study of the Elderly (1995/1996 to 2012/2013) were included. All-cause mortality was our outcome. Participants were divided into four groups based on their difference in overall physical activity between 1995/1996 and 2005/2006 measured by the Physical Activity Scale for the Elderly. Participants were classified as having unchanged low physical activity (n=339), decreased activity (n=233), unchanged high activity (n=166), and increased activity (n=65). Change in the frequency of physical activity domains were also investigated. Physical-activity domains included leisure, household, sedentary, and walking activities.
Results
After controlling for all covariates, results from the Cox proportional hazards regression found a 43% lower mortality risk in the increased physical activity group [Hazards Ratio (HR) =0.57, 95% Confidence Interval (CI) = 0.34–0.97)] compared to the unchanged low physical activity group. In the entire sample, a significantly lower mortality risk was also present among walking (HR=0.88) and household (HR=0.88) activities.
Conclusion
Our results suggest that, independent of other factors, increasing physical activity is most protective of mortality among older Mexican-Americans.