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running economy
Running economy consists of many physiological and biomechanical factors that contribute to running performance, and is measured to quantify energy utilization while running at an aerobic intensity. Oxygen consumption (VO2) is the most direct method for measuring running economy, as the exchange of gases in the body, specifically oxygen and carbon dioxide, closely reflects energy metabolism. Those who are able to consume less oxygen while running at a given velocity are said to have a better running economy.
In distance running, an athlete may attempt to improve performance through training designed to improve running economy. Running economy has been found to be a good predictor of race performance; it has been found to be a stronger correlate of performance than maximal oxygen uptake (VO2 max) in trained runners with the same values (Saunders, 2004). The literature relating to RE is vast and the determinants of RE supported by empirical data.
==Factors affecting running economy==
In ''The Lore of Running'', Tim Noakes, a professor of exercise and sports science at the University of Cape Town, and also recreational runner, describes a number of variables that may affect running economy: vertical motion while running, the ability of the muscles to absorb energy during the shock of landing and transfer it to push-off, biomechanical factors, technique and type of activity, fitness and training, age, fatigue, gender, race, weight of clothing and shoes, and environmental conditions.〔Noakes, Tim. 2003. ''The Lore of Running.'' (4th edition) Oxford University Press ISBN 0-87322-959-2〕
Various studies have shown marathon runners to be more economical than middle distance runners and sprinters at speeds of 6–12 miles per hour (10-19 kilometers per hour). At those speeds, film analysis has shown that sprinters and middle distance have more vertical motion than marathoners.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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