Postexercise rehydration with beer impairs fluid retention, reaction time, and balance

作者：Flores Salamanca Rebeca; Fernando Aragon Vargas Luis

来源：Applied Physiology Nutrition and Metabolism, 2014, 39(10): 1175-1181.

DOI：10.1139/apnm-2013-0576

• alcohol
• fluid balance
• dehydration
• diuresis
• drug effects
• diuretics
• ethanol
• humans

Beer is promoted by popular media as a good choice for rehydration, but there is limited support for the claim. To assess the effect of beer alcohol on rehydration and motor control, 11 young (24.4 +/- 3.7 years old) males of legal drinking age were dehydrated to 2.12% +/- 0.20% body mass (mean +/- SD) by exercising in a climatic chamber (31.7 +/- 1.6 degrees C, 55.0% +/- 8.3% relative humidity) on 3 different days, 1 week apart, and rehydrated with 100% of their sweat loss using water (WATER), 4.6% alcohol beer (BEER), or low-alcohol beer (LAB), in random order. Urine output, blood alcohol content (BAC), reaction time (RT), and balance (as measured by center of pressure velocity (V-CoP)) were measured every 30 min over 3 h and compared via 2-way, repeated-measures analyses of variance (ANOVAs). After consuming +/- 1.6 L in 1 h, urine output was greater for BEER (1218 +/- 279 mL) than for LAB (745 +/- 313 mL, p = 0.007) and WATER (774 +/- 304 mL, p = 0.043). BAC remained at 0 with WATER and LAB; with BEER, BAC reached 0.857 g/L (95% confidence intervals [0.752, 0.963]) immediately postrehydration. RT was longer for BEER (0.314 +/- 0.039 s) than for LAB (0.294 +/- 0.034 s, p = 0.009), but was no different from WATER (0.293 +/- 0.049 s, p = 0.077). V-CoPx was significantly higher for BEER (0.0284 +/- 0.0020 m/s) compared with LAB (0.0233 +/- 0.0010 m/s) or WATER (0.0238 +/- 0.0010 m/s) (p = 0.022), but V-CoPy was not different among beverages. In conclusion, rehydration with BEER resulted in higher diuresis, slower RT, and impaired V-CoP than rehydration with LAB or WATER.

• 出版日期2014-10