BLOOD-GLUCOSE AND GLUCOREGULATORY HORMONE RESPONSES TO SOLID AND LIQUID CARBOHYDRATE INGESTION DURING EXERCISE

This study was conducted to compare blood glucose and glucoregulatory hormone responses to the ingestion of solid and liquid carbohydrate (C HO) during prolonged cycling, followed by 30 min of isokinetic cycling . Eight male cyclists randomly completed three cycling trials (LC = li quid CHO, SCE = solid CHO with water equal to LC, SCA = solid CHO + ad libitum water). Each subject cycled for 120 min at 65% of (V) over do t O-2 max with CHO ingestion (0.6 g CHO/kg/hr) at 0, 30, 60, 90, and 1 20 min. Subjects then completed a 30-min maximal isokinetic ride at 90 rpm. There was no significant (p < .05) difference between the trials for plasma glucose, insulin, glucagon, glycerol, lactate, RER, HR, (V ) over dot O-2, RPE, and total work performed during the isokinetic ri de. However, serum glucose was significantly Lower in the SCE and SCA trials compared to LC at 80 min. The Ingestion of a solid food contain ing CHO, protein, and fat with added water produced similar blood gluc ose, metabolic, glucoregulatory hormone, and exercise performance resp onses to those seen with the ingestion of liquid CHO.