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Journal of the International Society of Sports Nutrition

, 4:15

First Online: 31 October 2007Received: 21 August 2007Accepted: 31 October 2007


This study examined the capabilities of an ultraendurance athlete to self-regulate their diet during an attempt on the record for the longest period of stationary cycling. The attempt required the athlete to complete at least 20 km-hr, with a 15 minute break allowed every eight hours. Laboratory tests determined a heart rate-oxygen consumption regression equation enabling calculation of energy expenditure from heart rate during the attempt. Energy intake was determined by a non-weighed dietary record collected at the time of consumption. The athlete completed 46.7 hours, covering 1126 km, at a speed of 24 ± 1.6 km-hr. He expended 14486 kcal and consumed 11098 kcal resulting in an energy deficit -3290 kcal and a weight loss -0.55 kg. The carbohydrate 42 ± 32 g-hr, water 422 ± 441 ml-hr, and sodium 306 ± 465 mg-hr intake were all below current recommendations. The athlete was unable to self-regulate his diet or exercise intensity to prevent a negative energy balance.

Electronic supplementary materialThe online version of this article doi:10.1186-1550-2783-4-15 contains supplementary material, which is available to authorized users.

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Autor: Ian B Stewart - Kelly L Stewart


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