Carbohydrate dependence during prolonged, intense endurance exercise
Journal article
Hawley, John and Leckey, Jill. (2015). Carbohydrate dependence during prolonged, intense endurance exercise. Sports Medicine: reviews of applied medicine and science in sport and exercise. 45, pp. 5 - 12. https://doi.org/10.1007/s40279-015-0400-1
Authors | Hawley, John and Leckey, Jill |
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Abstract | A major goal of training to improve the performance of prolonged, continuous, endurance events lasting up to 3 h is to promote a range of physiological and metabolic adaptations that permit an athlete to work at both higher absolute and relative power outputs/speeds and delay the onset of fatigue (i.e., a decline in exercise intensity). To meet these goals, competitive endurance athletes undertake a prodigious volume of training, with a large proportion performed at intensities that are close to or faster than race pace and highly dependent on carbohydrate (CHO)-based fuels to sustain rates of muscle energy production [i.e., match rates of adenosine triphosphate (ATP) hydrolysis with rates of resynthesis]. Consequently, to sustain muscle energy reserves and meet the daily demands of training sessions, competitive athletes freely select CHO-rich diets. Despite renewed interest in high-fat, low-CHO diets for endurance sport, fat-rich diets do not improve training capacity or performance, but directly impair rates of muscle glycogenolysis and energy flux, limiting high-intensity ATP production. When highly trained athletes compete in endurance events lasting up to 3 h, CHO-, not fat-based fuels are the predominant fuel for the working muscles and CHO, not fat, availability becomes rate limiting for performance. |
Year | 2015 |
Journal | Sports Medicine: reviews of applied medicine and science in sport and exercise |
Journal citation | 45, pp. 5 - 12 |
ISSN | 0112-1642 |
Digital Object Identifier (DOI) | https://doi.org/10.1007/s40279-015-0400-1 |
Page range | 5 - 12 |
Research Group | Mary MacKillop Institute for Health Research |
Publisher's version | File Access Level Controlled |
https://acuresearchbank.acu.edu.au/item/8qqv9/carbohydrate-dependence-during-prolonged-intense-endurance-exercise
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