Persistence of supercompensated muscle glycogen in trained subjects after carbohydrate loading
| Autor: | Patricia G. Law, David A. Arnall, H. W. Goforth, Brad L. Bennett |
|---|---|
| Rok vydání: | 1997 |
| Předmět: |
Adult
Male medicine.medical_specialty Glycogen Physiology VO2 max Carbohydrate Biology Persistence (computer science) chemistry.chemical_compound Endocrinology chemistry Physiology (medical) Internal medicine Dietary Carbohydrates medicine Humans Carbohydrate loading Exercise physiology Muscle Skeletal Exercise Supercompensation Trained subjects |
| Zdroj: | Journal of Applied Physiology. 82:342-347 |
| ISSN: | 1522-1601 8750-7587 |
| DOI: | 10.1152/jappl.1997.82.1.342 |
| Popis: | Goforth, Jr., Harold W., David A. Arnall, Brad L. Bennett, and Patricia G. Law. Persistence of supercompensated muscle glycogen in trained subjects after carbohydrate loading. J. Appl. Physiol. 82(1): 342–347, 1997.—Several carbohydrate (CHO)-loading protocols have been used to achieve muscle glycogen supercompensation and prolong endurance performance. This study assessed the persistence of muscle glycogen supercompensation over the 3 days after the supercompensation protocol. Trained male athletes completed a 6-day CHO-loading protocol that included cycle ergometer exercise and dietary manipulations. The 3-day depletion phase began with 115 min of cycling at 75% peak oxygen uptake followed by 3 × 60-s sprints and included the subjects consuming a low-CHO/high-protein/high-fat (10:41:49%) diet. Subjects cycled 40 min at the same intensity for the next 2 days. During the 3-day repletion phase, subjects rested and consumed a high-CHO/low-protein/low-fat (85:08:07%) diet, including a glucose-polymer beverage. A 3-day postloading phase followed, which involved a moderately high CHO diet (60%) and no exercise. Glycogen values for vastus lateralis biopsies at baseline and postloading days 1–3 were 408 ± 168 (SD), 729 ± 222, 648 ± 186, and 714 ± 196 mmol/kg dry wt, respectively. The CHO-loading protocol increased muscle glycogen by 1.79 times baseline, and muscle glycogen remained near this level during the 3-day postloading period. Results indicate that supercompensated muscle glycogen levels can be maintained for at least 3 days in a resting athlete when a moderate-CHO diet is consumed. |
| Databáze: | OpenAIRE |
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