Abstract
This study aimed to test whether hypertonic sports drinks (SD) containing multiple types of carbohydrate (CHO) promote fluid absorption in healthy young men. Eight healthy males (20‐30 y old) were randomly infused with three SD containing multiple types of CHO (6‐13% total CHO, 336 ‐ 678 mOsm/kg) at a rate of 15 ml/min using a triple‐lumen nasojejunal tube. Fluid samples collected from the proximal and distal ports located at approximately 10 and 50 cm from the pyloric sphincter were analyzed for osmolality and concentrations of a non‐absorbable marker PEG, CHO, sodium and potassium. Infusion of SD with 6% CHO (336 mOsm/kg) resulted in net fluid absorption whereas SD with 11‐13% CHO (653‐678 mOsm/kg) induced fluid secretion in the test segment and reductions in luminal fluid osmolality towards isotonicity. Rates of CHO absorption were similar among, and net secretion of Na+ and K+ were observed in, all SD tested. SD having 11‐13% CHO induced a higher rate of electrolyte secretion than those with 6% CHO. Plasma glucose was doubled at 30 min after infusion of all test solutions. Thus, the presence of multiple types of CHO in the hypertonic test beverages could not offset the influence of hypertonicity on fluid absorption. Moreover, rates of CHO absorption seem independent of CHO concentrations in the SD (Gatorade Sports Science Institution, USA)
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