Subscribed Content Ingesting a high-dose carbohydrate solution during the cycle section of a simulated Olympic-distance triathlon improves subsequent run performance

摘要

The well-established ergogenic benefit of ingesting carbohydrates during single-discipline endurance sports hasnonly been tested once within an Olympic-distance (OD) triathlon. The aim of the present study was to compare the effect ofningesting a 2:1 maltodextrin/fructose solution with a placebo on simulated OD triathlon performance. Six male and 4 femalenamateur triathletes (age, 25 ± 7 years; body mass, 66.8 ± 9.2 kg; peak oxygen uptake, 4.2 ± 0.6 L·min–1) completed an1500-m swim time-trial and an incremental cycle test to determine peak oxygen uptake before performing 2 simulated ODntriathlons. The swim and cycle sections of the main trials were of fixed intensities, while the run section was completed asna time-trial. Two minutes prior to completing every quarter of the cycle participants consumed 202 ± 20 mL of either a solutionncontaining 1.2 g·min–1 of maltodextrin plus 0.6 g·min–1 of fructose at 14.4% concentration (CHO) or a sugar-free,nfruit-flavored drink (PLA). The time-trial was 4.0% ± 1.3% faster during the CHO versus PLA trial, with run times ofn38:43 ± 1:10 min:s and 40:22 ± 1:18 min:s, respectively (p = 0.010). Blood glucose concentrations were higher in thenCHO versus PLA trial (p < 0.001), while perceived stomach upset did not differ between trials (p = 0.555). The currentnfindings show that a 2:1 maltodextrin/fructose solution (1.8 g·min–1 at 14.4%) ingested throughout the cycle section of a simulatednOD triathlon enhances subsequent 10-km run performance in triathletes