Effects of pre-exercise sucrose ingestion on thermoregulatory responses to near-maximal 5-kilometer running

Publication date: Available online 17 August 2018Source: Journal of Thermal BiologyAuthor(s): Patrick B. WilsonAbstractResearch has shown that carbohydrate consumption can increase body temperature at rest and, in some cases, during exercise. Most exercise studies, however, haven’t matched exercise intensity between carbohydrate and placebo conditions. The purpose of this randomized, double-blind, placebo-controlled trial was to examine whether pre-exercise carbohydrate consumption independently accelerates the usual temperature rise with intense exercise. Twenty-eight runners self-reported 5-km performance (16–23 minutes) and were randomized, using a matched-pairs design, to 750 mL water containing 100 g sucrose or 0.8 g aspartame. Beverages were consumed 60 minutes before running at 93% of maximum 5-km speed in temperate conditions. Gastrointestinal temperature, Thermal Sensation Scale (TSS) and Feeling Scale (FS) were recorded before ingestion, every 10 minutes during 60 minutes of rest, and every 1-km during the 5-km run. Rating of Perceived Exertion was recorded every 1-km. Independent samples t-tests and two-way mixed ANOVAs with repeated measures assessed whether there were baseline differences or treatment effects. Gastrointestinal temperature didn’t differ between carbohydrate (38.7 ± 0.4 °C) and placebo (38.6 ± 0.4 °C) by the end of the 5-km (p = 0.49). No group x time interactions or main group effects were fou...
Source: Journal of Thermal Biology - Category: Biology Source Type: research