Household physical activity and mortality in older adults: a national cohort study in Spain.

Abstract

OBJECTIVE: To examine the association between household physical activity (HPA) and all-cause mortality in a cohort of older adults from Spain, and the role of sedentary time on this association. METHOD: Prospective cohort study of 2874 individuals aged ≥ 62 years. In 2003, the time spent in HPA and the time spent seated were self-reported. The association of HPA with all-cause mortality through 2011 was assessed with Cox regression. RESULTS: During the follow-up, 970 participants died. In men, HPA was inversely associated with the risk of death only among those with longer sitting time (≥ 8 h/d): compared to those who did not do HPA, the mortality hazard ratio (HR) was 0.80 (95% confidence interval (CI): 0.60-1.08) and 0.43 (95% CI: 0.27-0.69) for those who spent >0 to 2h/d and >2h/d in HPA, respectively (P for trend<0.001). In women, sitting time did not modify the study association. Thus, compared to women who spent <2h/d in HPA, the HR for mortality was 0.72 (95% CI: 0.56-0.93) and 0.52 (95% CI: 0.39-0.70) for those who spent >2 to 4h/d, and >4h/d in HPA, respectively (P for trend<0.001). CONCLUSION: In women, HPA is associated with reduced mortality regardless of sitting time. HPA may also contribute to longer survival among men with longer sitting time.