Changes in running economy and mechanics during a submaximal 5-km run

Document Type


Date of Original Version



This study explored the effects of a submaximal 5-km run on the running economy (RE) and running mechanics (RM) of 14 female distance runners. Each subject was videotaped while running on a treadmill at a pace equivalent to 80 to 85% of her VO2max. Two running cycles were recorded 5 min into each subject's run and 1 min before it ended. The kinematic data were averaged to provide gait characteristics for an early run gait (G1) and an end-of-run gait (G2). Nineteen kinematic and physiological variables were analyzed by individual f tests to check for significant differences between Gl and G2. A modified Bonferroni statistic was applied to reduce the possibility of increased alpha error. Significant differences were found for oxygen consumption and shoulder range of motion. There were no significant associations between changes in oxygen uptake and the RM variables studied. However, post hoc analyses showed that increased ventilation was significantly correlated to the changes in RE. It was concluded that a submaximal 5-km run brings about variation in RE without causing substantial variation in RM. © 1995 National Strength & Conditioning Association.

Publication Title, e.g., Journal

Journal of Strength and Conditioning Research