Abstract des Autors

The present study examined the influence of the intake of three carbohydrate (CHO) drinks with different CHO content before 1 h-lasting physical workload, on the aerobic performance and on 25 blood variables. All drinks were with an equal CHO concentration (11%), but the drink A consisted of a combination of simple and complex sugars, the drink B consisted mainly of monosaccharides, and in the drink C disaccharides were included. Each of nine rowers of international level completed three trials (after the ingestion of drinks A, B, and C respectively) with a week interval. Each trial consisted of 60 min work on a rowing ergometer at 70-75% of VO2max. They received the CHO drinks (7 ml/kg bw) 10 min before the rowing session. It was found out that 1 h after the test and when the drink A was consumed, the PWC170 was greater (171.1+/-3.1 W) than in the trials with the drink B - 155.0+/-3.4 W (P<0.01), and with the drink C - 162.2+/-2.8 W (p<0.05). Sportsmen, who used the drink A, succeeded to maintain higher blood glucose concentrations during the 30-60 min interval of the rowing bout than in the trials when they consumed the drinks with simple sugars - B and C. The mixture of simple and complex sugars, which was included in the drink A better prevented dehydration in sportsmen (0.69+/-0.06 l/h) than the simple sugars in the drink B - 0.85+/-0.06 l/h (P<0.05) and in the drink C - 0.78+/-0.06 l/h (p>0.05). It was concluded that drinks comprising simple and complex sugars are more potent to maintain high blood glucose concentration between 30 and 60 min of exercise. They restrict to a greater extent body fluid loss that occurs during exercise and 2 hours after ingestion still provide higher aerobic capacity than pure monosaccaharide or mono-/disaccharide drinks. Verf.-Referat