In a cohort of U.S. veterans, high cardiorespiratory fitness was linked to lower risk for mortality across all age, sex and race groups, researchers reported.
In addition, extreme cardiorespiratory fitness was not associated with mortality.
The researchers followed 750,302 U.S. veterans aged 30 to 95 years at baseline (mean age, 61 years) for a median of 10.2 years and a total of 7,803,861 person-years. Participants were stratified into age- and sex-specific cardiorespiratory fitness categories as determined by results of a standardized exercise treadmill test expressed as metabolic equivalents