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Appears in Collections:Faculty of Health Sciences and Sport Journal Articles
Peer Review Status: Refereed
Title: Preexercise Carbohydrate Feeding and High-Intensity Exercise Capacity: Effects of Timing of Intake and Carbohydrate Concentration
Author(s): Galloway, S D
Lott, Matthew J E
Toulouse, Lindsay C
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Keywords: nutrition
Issue Date: Jun-2014
Citation: Galloway SD, Lott MJE & Toulouse LC (2014) Preexercise Carbohydrate Feeding and High-Intensity Exercise Capacity: Effects of Timing of Intake and Carbohydrate Concentration, International Journal of Sport Nutrition and Exercise Metabolism, 24 (3), pp. 258-266.
Abstract: The present study aimed to investigate the influence of timing of pre-exercise carbohydrate feeding (Part A), and carbohydrate concentration (Part B), on short-duration high-intensity exercise capacity. In Part A, seventeen males, and in Part B ten males, performed a peak power output (PPO) test, two familiarisation trials at 90% of PPO, and 4 (for Part A) or 3 (for Part B) experimental trials involving exercise capacity tests at 90% PPO. In Part A, the 4 trials were conducted following ingestion of a 6.4% carbohydrate/electrolyte sports drink ingested 30 (C30) or 120 (C120) minutes before exercise, or a flavour-matched placebo administered either 30 (P30) or 120 (P120) minutes before exercise. In Part B, the 3 trials were performed 30 minutes after ingestion of 0%, 2% or 12% carbohydrate solutions. All trials were performed in a double blind cross-over design following and overnight fast. Dietary intake and activity in the two days before trials was recorded and replicated on each visit. Glucose, lactate, heart rate and mood/arousal were recorded at intervals during the trials. In Part A, C30 produced the greatest exercise capacity (mean±SD; 9.0±1.9 min, P<0.01) compared with all other trials (7.7±1.5 min P30, 8.0±1.7 min P120, 7.9±1.9 min C120). In Part B, exercise capacity (min) following ingestion of the 2% solution (9.2±2.1) compared with 0% (8.2±0.7) and 12% (8.0±1.3) solutions approached significance (p=0.09). This study provides new evidence to suggest that timing of carbohydrate intake is important in short duration high-intensity exercise tasks, but a concentration effect requires further exploration.
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Rights: Publisher allows this work to be made available in this repository. “As accepted for publication” in International Journal of Sport Nutrition and Exercise Metabolism 2014, 24, 258 – 266 by Human Kinetics with the following policy: The author retains the right to post an electronic version of the final manuscript, as accepted for publication, on the authors’ own Web site or Web site(s) or other electronic repositories controlled by the authors’ institution, provided that the electronic version is in PDF or other image capturing format. This copy is 'as accepted for publication' and not the final version of the article. The published version is available at:

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