Research article
Energy balance during two days of continuous stationary cycling
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* Corresponding author: Ian B Stewart i.stewart@qut.edu.au
1 Institute of Health and Biomedical Innovation, Queensland University of Technology, Australia
2 School of Public Health, Queensland University of Technology, Australia
Journal of the International Society of Sports Nutrition 2007, 4:15 doi:10.1186/1550-2783-4-15
Published: 31 October 2007Abstract
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.