Title

Carbohydrate-electrolyte ingestion has no effect on high intensity running performance or blood metabolites

Publication Date

2002

Document Type

Article

Abstract

This study was designed to explore the effect of a carbohydrate-electrolyte solution (CE) on time to exhaustion in treadmill running. After a 12-hr fast, competitive male runners (mean±SD; age 24.10±4.31 years; body mass 74.27±19.51 kg; VO2peak 65.51±7.19 ml/kg/min) from western Massachusetts (n=10) performed two run to exhaustion protocols, each a week apart, at 100% VO2peak. Sixty minutes prior to the run, subjects ingested either a CE or a placebo (PL) beverage. Variables of glucose, lactate, ammonia, respiratory exchange ratio (RER), and The Borg Category-Ratio Scale Rate of Perceived Exertion (RPE) were examined with a repeated measures 2x3 analysis of variance (ANOVA), computed separately for each variable. The interaction effect was not significant (p>0.05) for any variable. The main effects for time were significant (p<0.05) for lactate, RER, and RPE. Lactate, RER, and RPE scores were higher at the end of the run as compared to the baseline and post warm-up time periods. No differences were found for glucose and ammonia. A repeated measures t-test was employed to compare the time to exhaustion scores. Time to exhaustion was not significantly (p>0.05) longer during the CE trial. In conclusion, time to exhaustion at 100% VO2peak was not improved with the consumption of a CE beverage prior to the run.

Original Citation

Robinson E.M., Graham L.B., Moncada J., Jensen B., Jones M., Headley S.A. (2002). Carbohydrate-electrolyte ingestion has no effect on high intensity running performance or blood metabolites. Journal of Exercise Physiology Online, 5(1), 49-55.