The Effect of Intermittent High-Intensity Running on Gastric Emptying of Fluids in Man

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Purpose:This study examined the effect of variable-intensity shuttle running on gastric emptying of a carbohydrate-free placebo (Plac) drink and of a 6.4% carbohydrate-electrolyte (CHO) sports drink.Method:We compared the volume of test drink emptied during two 15-min periods of walking exercise (WE) with that during two 15-min periods of the Loughborough Intermittent Shuttle Test (LIST). Gastric emptying was measured on the four trials using a double-sampling aspiration technique in eight healthy males after ingestion of a 420 ± 49 mL and a 168 ± 20 mL bolus of the appropriate test drink at the start of the first and second exercise period, respectively.Results:During the initial 15 min of exercise, the mean (±SD) volume of Plac (124 ± 95 mL) and CHO (71 ± 43 mL) drink emptied was similar between the two LIST trials, but the volume of Plac (227 ± 85 mL) and CHO (159 ± 63 mL) drinks emptied on the WE trials was greater than for the respective test drinks on the LIST trials. Similar volumes of test drinks were emptied on all trials (P = 0.20) during the second 15 min of exercise. Over the 30 min of each trial, the exercise intensity of the LIST reduced the volume of the Plac (211 ± 108 mL) and CHO (208 ± 83 mL) drink emptied compared with that on the WE trial for the Plac (396 ± 74 mL) and CHO (293 ± 73 mL) drink, respectively.Conclusions:The exercise intensity of the LIST is sufficient to slow gastric emptying of carbohydrate and noncarbohydrate containing drinks compared with walking. Dilute carbohydrate-electrolyte drinks empty at about the same rate as carbohydrate-free beverages during variable-intensity running.

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