Characteristics Associated with 10-km Running Performance among a Group of Highly Trained Male Endurance Runners Age 21–63 Years

This study assessed physiological and cardiac factors associated with 10-km running performance in a group of highly trained endurance runners age 21–63 years. Participants ( N = 37) underwent a resting echocardiograph and incremental treadmill running test. They also provided information on their recent 10-km races. Data were analyzed using “best subsets” multiple regression. Declines with age were found for 10-km running speed (0.26 m · s −1 · decade −1 ), maximum heart rate (4 beats/decade), VO 2peak (6 ml · kg −1 · min −1 · decade −1 ), velocity at lactate threshold (1 m · s −1 · decade −1 ), and VO 2 at lactate threshold (4 ml · kg −1 · min −1 · decade −1 ). The percentage of VO 2peak at which lactate threshold occurred increased with age by 1.5% per decade. The rate of change of displacement of the atrioventricular plane at the left free wall and septum both declined by 1 cm · s −1 · decade −1 . The best single predictor of 10-km running speed was velocity at lactate threshold.