Cardiorespiratory Fitness as a Predictor of Dementia Mortality in Men and Women

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Abstract

Purpose

We sought to determine whether fitness is associated with lower risk for dementia mortality in women and men.

Methods

We followed 14,811 women and 45,078 men, age 20–88 yr at baseline, for an average of 17 yr. All participants completed a preventive health examination at the Cooper Clinic in Dallas, TX, during 1970–2001. Fitness was measured with a maximal treadmill exercise test, with results expressed in maximal METs. The National Death Index identified deaths through 2003. Cox proportional hazards models were used to examine the association between baseline fitness and dementia mortality, adjusting for age, sex, examination year, body mass index, smoking, alcohol use, abnormal ECGs, and health status.

Results

There were 164 deaths with dementia listed as the cause during 1,012,125 person-years of exposure. Each 1-MET increase in fitness was associated with a 14% lower adjusted risk of dementia mortality (95% confidence interval (CI) = 6%–22%). With fitness expressed in tertiles, adjusted hazard ratios (HRs) for those in the middle- and high-fitness groups suggest their risk of dementia mortality was less than half that of those in the lowest fitness group (HR = 0.44, CI = 0.26–0.74 and HR = 0.49, CI = 0.26–0.90, respectively).

Conclusions

Greater fitness was associated with lower risk of mortality from dementia in a large cohort of men and women.

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