Carbohydrate feeding prior to and during high-intensity exercise and its effect on endurance performance in trained adolescents (14-16 years)
University of Wales Institute Cardiff
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The current study investigated the effects of feeding a CHO solution, prior to and during performance, on cycle time-trial performance under thermoneutral conditions, in adolescent athletes. 4 male and 6 female adolescent (15.7 ± 1.6 years) cyclists undertook a 45 minute self-paced time-trial on 2 separate occasions, 1 where only water was fed and 1 with ingestion of a CHO solution. During the no CHO trial, participants were given a 5 min period to drink water ad lib. at 10 minute intervals. During the CHO trial, 5 mins after consuming a bolus of 6 ml . kg BM of a 6.4% CHO solution and immediately following a warm up, the participants undertook the self-paced time-trial. During the exercise period distance (km) power output (PO, W) and heart rate (HR, bpm-1) were monitored and recorded every 5 mins. The major findings of the study demonstrated that there were no significant differences in the performance between the 2 treatments. The overall effect of the treatment proved to not be significant (P > 0.05) for the total average distance (23.84 ± 5.99 and 24.88 ± 7.13), PO (172.8 ±201.2 and 183.93 ± 190.07 W) and HR (163.74 ± 28.26 and 168.16 ± 23.84 bpm-1, no CHO and CHO respectively). However, the results did show that there was a significant time effect in that distance achieved, PO and HR were all significantly higher in the last 5 min bout when compared to the preceding bouts for both of the treatment conditions.
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