Influence of sodium on glucose bioavailability during exercise

Abstract

To examine the influence of beverage sodium content on glucose bioavailability during exercise, six trained men were studied during 30 min of cycle ergometer exercise at 65% VO2max. Immediately prior to exercise, subjects ingested 400 ml of a 10% glucose solution containing 100 μCi of D-(3-3H]-glucose, with a sodium concentration of either 0,25, or 50 mmo1•1−1. Trials were conducted in the morning after an overnight fast and in randomized order at least 1 wk apart. Blood samples were obtained from a forearm vein before and during exercise and subsequently analyzed for plasma glucose and 3H-glucose activity and blood lactate. No differences in oxygen uptake, heart rate, or blood lactate were ..