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Medical Forum / General / Nutrition / February 2007Carbonated drinks and exercise
Books giving nutritional advice for hiking trips commonly state "do not take fizzy drinks" or "allow carbonated drinks to go flat before consumption". Nobody has given me a plausible scientific explanation for the advice and I've often had a canned drink on hill walking expeditions with no ill effect. The best explanation I've heard is that in an activity like running - if a can of coke is drunk while still on the move, the gas-bloat may be uncomfortable. But consumed at a meal break surely the gas will be belched out - I understand the volume of co2 in 100ml of cola is about 200ml of which probably about 40ml is released when the can is opened. I know there are other debates around topics like the suggestion that caffeine (in cola drinks) is a diuretic but lets handle that discussion seperately. Is it a myth or can anyone propose a good reason why carbonated drinks are inappropriate - ideally with scientific support rather than opinion or hearsay... > Books giving nutritional advice for hiking trips commonly state "do > not take fizzy drinks" or "allow carbonated drinks to go flat before [quoted text clipped - 19 lines] > are inappropriate - ideally with scientific support rather than > opinion or hearsay... The effects of a carbonated carbohydrate drink on gastric emptying, gastrointestinal distress, and exercise performance. * Zachwieja JJ, * Costill DL, * Beard GC, * Robergs RA, * Pascoe DD, * Anderson DE. Div. of Metabolism, Washington U. School of Medicine, St. Louis, MO 63110. To determine the effect of a carbonated carbohydrate (CHO) drink on gastric function and exercise performance, eight male cyclists completed four 120-min bouts of cycling. Each bout consisted of a 105- min ride at 70% VO2max followed by a 15-min self-paced performance ride. During each trial, one of four test solutions was ingested: carbonated CHO (C-10%), noncarbonated CHO (NC-10%), carbonated non-CHO (C), and noncarbonated non-CHO (NC). Following the performance ride, the subjects had their stomach contents removed by aspiration. There were no significant differences in gastric emptying (GE) except for Trial C-10%, which averaged 13.3% less than NC. However, there was no difference in the perception of gastrointestinal comfort between this trial and any other. Average power output during the performance ride was not significantly different between carbonated and noncarbonated trials, or between CHO-fed and no-CHO trials; however, the subjects worked at a greater intensity when fed CHO. Finally, acid base status did not change when a carbonated drink was ingested. This indicates that adding carbonation to a sport drink does not significantly alter gastric function, the perception of GI comfort, or exercise performance. >> Is it a myth or can anyone propose a good reason why carbonated drinks >> are inappropriate - ideally with scientific support rather than [quoted text clipped - 32 lines] >gastric function, the perception of GI comfort, or exercise >performance. Wow - Thanks a lot for an excellent reference, just what I need! |
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