Hypohydration does not impair skeletal muscle glycogen resynthesis after exercise
| Autor: | Leslie Levine, Michael N. Sawka, Andrew J. Young, Williams A. Latzka, P. D. Neufer, M. D. Quigley |
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| Rok vydání: | 1991 |
| Předmět: |
Adult
Male medicine.medical_specialty Adolescent Physiology Energy metabolism Sweating Physical exercise Body weight chemistry.chemical_compound Oxygen Consumption Body Water Physiology (medical) Internal medicine Dietary Carbohydrates medicine Humans Exercise physiology Exercise Dehydration Glycogen Chemistry Muscles Skeletal muscle medicine.anatomical_structure Endocrinology Bicycle ergometer |
| Zdroj: | Journal of Applied Physiology. 70:1490-1494 |
| ISSN: | 1522-1601 8750-7587 |
| DOI: | 10.1152/jappl.1991.70.4.1490 |
| Popis: | The purpose of this investigation was to examine the effects of moderate hypohydration (HY) on skeletal muscle glycogen resynthesis after exhaustive exercise. On two occasions, eight males completed 2 h of intermittent cycle ergometer exercise (4 bouts of 17 min at 60% and 3 min at 80% of maximal O2 consumption/10 min rest) to reduce muscle glycogen concentrations (control values 711 +/- 41 mumol/g dry wt). During one trial, cycle exercise was followed by several hours of light upper body exercise in the heat without fluid replacement to induce HY (-5% body wt); in the second trial, sufficient water was ingested during the upper body exercise and heat exposure to maintain euhydration (EU). In both trials, 400 g of carbohydrate were ingested at the completion of exercise and followed by 15 h of rest while the desired hydration level was maintained. Muscle biopsy samples were obtained from the vastus lateralis immediately after intermittent cycle exercise (T1) and after 15 h of rest (T2). During the HY trial, the muscle water content was lower (P less than 0.05) at T1 and T2 (288 +/- 9 and 265 +/- 5 ml/100 g dry wt, respectively; NS) than during EU (313 +/- 8 and 301 +/- 4 ml/100 g dry wt, respectively; NS). Muscle glycogen concentration was not significantly different during EU and HY at T1 (200 +/- 35 vs. 251 +/- 50 mumol/g dry wt) or T2 (452 +/- 34 vs. 491 +/- 35 mumol/g dry wt). These data indicate that, despite reduced water content during the first 15 h after heavy exercise, skeletal muscle glycogen resynthesis is not impaired. |
| Databáze: | OpenAIRE |
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