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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Kranenburg, Janneau van Kuipers, Harm Loon, Luc J. C. van Senden, Joan M. Beelen, Milou |
| Description | Country affiliation: Netherlands Author Affiliation: Beelen M ( Department of Human Movement Sciences, NUTRIM School for Nutrition, Toxicology and Metabolism, Maastricht University Medical Centre, Maastricht, The Netherlands.) |
| Abstract | BACKGROUND: Both protein and caffeine coingestion with CHO have been suggested to represent effective dietary strategies to further accelerate postexercise muscle glycogen synthesis in athletes. PURPOSE: This study aimed to assess the effect of protein or caffeine coingestion on postexercise muscle glycogen synthesis rates when optimal amounts of CHO are ingested. METHODS: Fourteen male cyclists were studied on three different test days. Each test day started with a glycogen-depleting exercise session. This was followed by a 6-h recovery period, during which subjects received 1.2 g·kgâ »¹·hâ »¹ CHO, the same amount of CHO with 0.3 g·kgâ »¹·hâ »¹ of a protein plus leucine mixture (CHO + PRO), or 1.7 mg·kgâ »¹·hâ »¹ caffeine (CHO + CAF). All drinks were enriched with [U-¹³C6]-labeled glucose to assess potential differences in the appearance rate of ingested glucose from the gut. Muscle biopsies were collected immediately after cessation of exercise and after 6 h of postexercise recovery. RESULTS: The plasma insulin response was higher in CHO + PRO compared with CHO and CHO + CAF (P < 0.01). Plasma glucose responses and glucose appearance rates did not differ between experiments. Muscle glycogen synthesis rates averaged 31 ± 4, 34 ± 4, and 31 ± 4 mmol·kgâ »¹ dry weight·hâ »¹ in CHO, CHO + PRO, and CHO + CAF, respectively (P = NS). In accordance, histochemical analyses did not show any differences between net changes in Type I and Type II muscle fiber glycogen content between experiments. CONCLUSIONS: Coingestion of protein or caffeine does not further accelerate postexercise muscle glycogen synthesis when ample amounts of CHO (1.2 g·kgâ »¹·hâ »¹) are ingested. |
| ISSN | 01959131 |
| Issue Number | 4 |
| Volume Number | 44 |
| e-ISSN | 15300315 |
| Journal | Medicine & Science in Sports & Exercise |
| Language | English |
| Publisher | Lippincott Williams & Wilkins (on behalf of the American College of Sports Medicine) |
| Publisher Date | 2012-04-01 |
| Publisher Place | United States |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Bicycling Physiology Caffeine Pharmacology Glycogen Biosynthesis Muscle, Skeletal Metabolism Adult Blood Glucose Drug Effects Dietary Carbohydrates Administration & Dosage Dietary Proteins Epinephrine Blood Fatty Acids, Nonesterified Humans Insulin Lactic Acid Leucine Male Norepinephrine Oxygen Consumption Young Adult Journal Article Randomized Controlled Trial Discipline Sports Science |
| Content Type | Text |
| Resource Type | Article |
| Subject | Orthopedics and Sports Medicine Physical Therapy, Sports Therapy and Rehabilitation Sports Science |
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