Issn Print: 0195-9131
Publication Date: 1996/05/01
DISTANCE RUNNING PERFORMANCE IS IMPROVED WITH CARBOHYDRATE INTAKE 766
J. A. Doyle; M. B. Elliott
Excerpt
The purpose of this study was to determine if the consumption of a carbohydrate-electrolyte beverage (CEB) would improve distance running performance in a thermoneutral environment. Eleven endurance trained subjects(7 females, 4 males) ran 3 trials on a treadmill in the laboratory after an overnight fast, each trial consisting of 90 min at a fixed intensity (66.9± 2.0% VO2max) followed by a 10 km time trial (TT) on the treadmill. During trials 2 and 3, each subject was given in double blind, random order either.25 g CHO/kg BW every 15 min in an 8% CEB (mean fluid intake of 185.5 ± 7.7 ml) or a similarly flavored and colored placebo(PLA). Performance time was considered as the time to complete the 10 km time trial, during which the subjects could voluntarily increase or decrease the belt speed. Oxygen consumption and heart rate were not different during the 90 min runs, and the temperature in the lab was not different between the CEB and PLA trials (p<.05). When consuming the CEB, subjects completed the TT significantly faster than when consuming PLA (46.12 ± 1.84 and 47.55± 1.77 min, respectively, p<.05). Time to complete miles 1, 2, and 3 during the TT were not different, but during the CEB trial, subjects ran miles 4, 5, and 6 significantly faster (p<.05). Rating of perceived exertion(RPE) at 40 min of the 90 min run was not different between trials, but was significantly greater at 80 min during the PLA trial (p<.05). Under carefully controlled, thermoneutral laboratory conditions, consumption of 1 g CHO/kg BW/h improved performance and reduced the perception of effort in a distance running performance task.
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