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

Autor:	Cathcart, Andrew J., Murgatroyd, Scott R., McNab, Alison, Whyte, Laura J., Easton, Chris
Předmět:	CYCLING DIETARY supplements CARBOHYDRATES in the body PHYSIOLOGICAL effects of proteins PHYSICAL fitness CREATINE kinase PHYSIOLOGICAL adaptation ATHLETIC ability BODY temperature regulation COMBINATION drug therapy COMPARATIVE studies COMPETITION (Psychology) CARBOHYDRATE content of food HEAT RESEARCH methodology MEDICAL cooperation MOTOR vehicles DIETARY proteins RESEARCH EVALUATION research
Zdroj:	European Journal of Applied Physiology; Aug2011, Vol. 111 Issue 9, p2051-2061, 11p, 4 Charts, 7 Graphs
Abstrakt:	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. [ABSTRACT FROM AUTHOR]
Databáze:	Complementary Index
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