Accelerometer-determined physical activity and mortality in a national prospective cohort study: Considerations by visual acuity.

Abstract

BACKGROUND: Previous research demonstrates that visual impairment (VI) is associated with increased all-cause mortality risk and is also associated with reduced physical activity participation. Although physical activity is reduced among those with VI, no studies have examined the relationship between physical activity and all-cause mortality across different visual function statuses, which is noteworthy of investigation as physical activity is linked with greater survival. METHODS: Data from the 2003-2006 NHANES were employed, with physical activity assessed via accelerometry and visual function assessed using the ARK-760 autorefractor. RESULTS: For those with normal vision, and after adjustments, for every 60min increase in physical activity, normal-sighted adults had an 18% (HR=0.82; 95% CI: 0.72-0.93) reduced risk of all-cause mortality. Similarly, after adjustments and for every 60min increase in physical activity for those with uncorrected refractive error and VI, respectively, there was a 15% (HR=0.85; 95% CI: 0.72-1.00) and 35% (HR=0.65; 95% CI: 0.43-0.98) reduced risk of all-cause mortality. Among all three visual status groups, sedentary behavior was not associated with mortality status. CONCLUSION: Among those with varying degrees of visual loss, sedentary behavior was not associated with mortality, but physical activity demonstrated survival benefits.