Combined carbohydrate-protein supplementation improves competitive endurance exercise performance in the heat

Cathcart, Andrew J., Murgatroyd, Scott R., McNab, Alison, Whyte, Laura J. and Easton, Chris (2011) Combined carbohydrate-protein supplementation improves competitive endurance exercise performance in the heat. European Journal of Applied Physiology, 111(9), pp. 2051-2061. ISSN (print) 1439-6319

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Abstract

Laboratory-based studies have demonstrated that adding protein (PRO) to a carbohydrate (CHO) supplement can improve thermoregulatory capacity, exercise performance and recovery. However, no study has investigated these effects in a competitive sporting context. This study assessed the effects of combined CHO-PRO supplementation on physiological responses and exercise performance during 8 days of strenuous competition in a hot environment. Twenty-eight cyclists participating in the TransAlp mountain bike race were randomly assigned to fitness-matched placebo (PLA 76 g L(-1) CHO) or CHO-PRO (18 g L(-1) PRO, 72 g L(-1) CHO) groups. Participants were given enough supplements to allow ad libitum consumption. Physiological and anthropometric variables were recorded pre- and post-exercise. Body mass decreased significantly from race stage 1 to 8 in the PLA group (-0.75 ± 0.22 kg, P = 0.01) but did not change in the CHO-PRO group (0.42 ± 0.42 kg, P = 0.35). Creatine kinase concentration and muscle soreness were substantially elevated during the race, but were not different between groups (P = 0.82, P = 0.44, respectively). Urine osmolality was significantly higher in the CHO-PRO versus the PLA group (P = 0.04) and the rise in tympanic temperature from pre- to post-exercise was significantly less in CHO-PRO versus PLA (P = 0.01). The CHO-PRO group also completed the 8 stages significantly quicker than the PLA group (2,277 ± 127 vs. 2,592 ± 68 min, respectively, P = 0.02). CHO-PRO supplementation therefore appears to prevent body mass loss, enhance thermoregulatory capacity and improve competitive exercise performance despite no effect on muscle damage.

Item Type: Article
Uncontrolled Keywords: cycling, recovery, sports drinks, fatigue, endurance, time-trial performance, prolonged strenuous exercise, muscle glycogen-storage, isocaloric carbohydrate, electrolyte replacement, cycling performance, plasma-volume, ingestion, recovery, postexercise
Research Area: Biological sciences
Sports-related studies
Faculty, School or Research Centre: Faculty of Science, Engineering and Computing > School of Life Sciences
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Depositing User: Automatic Import Agent
Date Deposited: 15 Nov 2011 11:45
Last Modified: 15 Nov 2011 11:45
URI: http://eprints.kingston.ac.uk/id/eprint/21162

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