Postexercise Glucose–Fructose Coingestion Augments Cycling Capacity During Short-Term and Overnight Recovery From Exhaustive Exercise, Compared With Isocaloric Glucose
| Autor: | Javier T. Gonzalez, Thomas A Green, James A. Betts, Edward A Gray |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Adult
Blood Glucose Male Time Factors Medicine (miscellaneous) Fructose Beverages Double blind Young Adult 03 medical and health sciences chemistry.chemical_compound 0302 clinical medicine Animal science Double-Blind Method Humans Ingestion Single-Blind Method Orthopedics and Sports Medicine Lactic Acid Cross-Over Studies Nutrition and Dietetics Glycogen Chemistry 030229 sport sciences General Medicine Carbohydrate Crossover study Bicycling Glucose Liver Physical Endurance Female Single blind Cycling Oxidation-Reduction 030217 neurology & neurosurgery |
| Zdroj: | International Journal of Sport Nutrition and Exercise Metabolism. 30:54-61 |
| ISSN: | 1543-2742 1526-484X |
| DOI: | 10.1123/ijsnem.2019-0211 |
| Popis: | During short-term recovery, postexercise glucose–fructose coingestion can accelerate total glycogen repletion and augment recovery of running capacity. It is unknown if this advantage translates to cycling, or to a longer (e.g., overnight) recovery. Using two experiments, the present research investigated if postexercise glucose–fructose coingestion augments exercise capacity following 4-hr (short experiment;n = 8) and 15-hr (overnight experiment;n = 8) recoveries from exhaustive exercise in trained cyclists, compared with isocaloric glucose alone. In each experiment, a glycogen depleting exercise protocol was followed by a 4-hr recovery, with ingestion of 1.5 or 1.2 g·kg−1·hr−1carbohydrate in the short experiment (double blind) and the overnight experiment (single blind), respectively. Treatments were provided in a randomized order using a crossover design. Four or fifteen hours after the glycogen depletion protocol, participants cycled to exhaustion at 70%Wmaxor 65%Wmaxin the short experiment and the overnight experiment, respectively. In both experiments there was no difference in substrate oxidation or blood glucose and lactate concentrations between treatments during the exercise capacity test (trial effect,p > .05). Nevertheless, cycling capacity was greater in glucose + fructose versus glucose only in the short experiment (28.0 ± 8.4 vs. 22.8 ± 7.3 min,d = 0.65,p = .039) and the overnight experiment (35.9 ± 10.7 vs. 30.6 ± 9.2 min,d = 0.53,p = .026). This is the first study to demonstrate that postexercise glucose–fructose coingestion enhances cycling capacity following short-term (4 hr) and overnight (15 hr) recovery durations. Therefore, if multistage endurance athletes are ingesting glucose for rapid postexercise recovery then fructose containing carbohydrates may be advisable. |
| Databáze: | OpenAIRE |
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