• David Martínez-Gómez, Pilar Guallar-Castillón, Luz M León-Muñoz, and Fernando Rodríguez-Artalejo.
• Department of Preventive Medicine and Public Health, School of Medicine, Universidad Autónoma de Madrid, Madrid, Spain; IdiPAZ-CIBER of Epidemiology and Public Health (CIBERESP), Madrid, Spain. Electronic address: d.martinez@uam.es.
• Prev Med. 2014 Apr 1; 61: 14-9.

ObjectiveTo 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.MethodProspective 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.ResultsDuring 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).ConclusionIn women, HPA is associated with reduced mortality regardless of sitting time. HPA may also contribute to longer survival among men with longer sitting time.Copyright © 2014 Elsevier Inc. All rights reserved.

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