Document Type

Article

Publication Title

Applied Physiology, Nutrition, and Metabolism

Abstract

This study examined the effects of a DL-hydroxybutyrate (HB) containing beverage on cognitive and performance measures during a bout of repeated Wingates. Fifteen healthy, college-aged males (mean plus or minus standard deviation; age: 23.1 plus or minus 2.4 years, height: 165.4 plus or minus 2.0 cm, mass: 81.4 plus or minus 9.2 kg) volunteered for the present study. Trial 1 consisted of baseline measures and familiarization for the protocol. During trials 2 and 3, subjects reported to the laboratory after a 10-hour fast and ingested 11.38 grams of HB or a placebo (PLA) beverage 30 minutes before exercise. Participants then completed a cognitive challenge (CC), consisting of a 5-minute FitLight response task while cycling. At the end of the test, participants then completed four 15-second repeated Wingates with 4 minutes of rest between, followed by another 5-minute CC response task. Blood ketones, glucose, and lactate were measured before the CC and after the Wingates. HB levels were significantly higher compared with PLA (0.53 vs. 0.21 mmol per liter, respectively). A significant order effect was observed across trials 2 and 3 for total FitLight misses and hits, regardless of treatment. Further, there were no significant differences in Wingate power output between treatments, although fatigue index was higher in the HB group compared with PLA (32.3 vs. 29.4 watts per second, respectively). In conclusion, HB did not improve high-intensity cycling or cognitive performance measures; however, these findings might be partially explained by the absolute dosing protocol used for HB in the present study as opposed to a relative (grams per kilogram) dosing protocol used in previous research.

First Page

711

Last Page

717

DOI

10.1139/apnm-2017-0724

Publication Date

2018

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