Section: Original Investigation
Authors: Ben Desbrow1,2, Daniel Murray1, and Michael Leveritt3
Affiliations: 1School of Public Health, Griffith University, Gold Coast Campus, Queensland, Australia. 2Research Centre for Clinical and Community Practice Innovation, Griffith Health Institute, Griffith University, Gold Coast Campus, Queensland, Australia. 3School of Human Movement Studies, University of Queensland, Brisbane, Queensland, Australia.
Acceptance Date: April 29, 2013
Purpose: To investigate the effect of manipulating the alcohol and sodium content of beer on fluid restoration following exercise.
Method: Seven male volunteers exercised on a cycle ergometer until 1.96±0.25% body mass (mean±SD) was lost. Participants where then randomly allocated a different beer to consume on four separate occasions. Drinks included a low alcohol beer (2.3% ABV) [LightBeer], a low alcohol beer with 25 mmol·L-1 of added sodium [LightBeer+25], a full strength beer (4.8% ABV) [Beer] or a full strength beer with 25 mmol·L-1 of added sodium [Beer+25]. Volumes consumed were equivalent to 150% of body mass loss during exercise and were consumed over a 1h period. Body mass and urine samples were obtained before and hourly for 4h after beverage consumption.
Results: Significantly enhanced net fluid balance was achieved following the LightBeer+25 trial (-1.02±0.35 kg) compared to the Beer (-1.59±0.32 kg) and Beer+25 (-1.64±0.28 kg) treatments. Accumulated urine output was significantly lower in the LightBeer+25 trial (1477±485 mL) compared to the Beer+25 (2101±482 mL) and Beer (2175±372 mL) trials.
Conclusion: A low alcohol beer with added sodium offers a potential compromise between a beverage with high social acceptance and one which avoids the exacerbated fluid losses observed when consuming full strength beer.
Key Words: Rehydration, Fluid Balance, Exercise, Electrolytes, Diuresis