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[RC] Another carb study - Ridecamp Guest

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Authors O Spendiff, IG Campbell
Title   Influence of pre-exercise glucose ingestion of two concentrations on 
paraplegic athletes
Full source     Journal of Sports Sciences, 2005, Vol 23, Iss 1, pp 21-30

       In this study, we assessed the influence that pre-exercise glucose 
ingestion of two concentrations has on the physiological responses of 
paraplegic athletes. Eight men with paraplegia ingested a drink containing 4 % 
(low) or 11 % (high) carbohydrate in a randomized double-blind crossover 
design, 20 min before exercise. The participants performed wheelchair exercise 
at 65 % of peak oxygen uptake for 1 h followed by a 20 min performance test. 
During both trials, the physiological responses were similar and indicated 
steady-state exercise. At the onset of exercise, blood glucose concentrations 
in both trials increased after carbohydrate ingestion (P < 0.05) before 
returning to resting values after 20 min of exercise and there were no 
differences between trials. Free fatty acid concentrations increased from rest 
to I h of exercise in both trials, with a greater increase during the low 
carbohydrate trial that led to a difference in free fatty acids between trials 
at the end of the 1 h tests (P < 0.05). There was a tendency for the 
performance distances and power outputs achieved during the high carbohydrate 
trial to be greater than those achieved during the low carbohydrate trial (P = 
0.08). In conclusion, when paraplegic athletes ingested low and high 
carbohydrate drinks before exercise, the decline in blood glucose 
concentrations was similar. The tendency for higher blood glucose 
concentrations, respiratory exchange ratios and power outputs and lower free 
fatty acid concentrations (P < 0.05) during the high carbohydrate trial 
suggests that a higher concentration of carbohydrate in a sports drink might be 
a better choice for paraplegic athletes.


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