Protein and Energy Metabolism During Prolonged Exercise in Trained Athletes*
| Autor: | Reed W. Hoyt, W. D.B. Hiller, R. R. Wolfe, T. P. Stein, M. D. Schluter, M'o. Toole, M. J. Leskiw |
|---|---|
| Rok vydání: | 1989 |
| Předmět: |
Adult
Blood Glucose Male medicine.medical_specialty Physical Therapy Sports Therapy and Rehabilitation Physical exercise Carbohydrate metabolism Running Lipid oxidation Leucine Endurance training Internal medicine medicine Humans Orthopedics and Sports Medicine Amino Acids Exercise Clinical Trials as Topic Physical Education and Training Pulmonary Gas Exchange Chemistry Protein turnover Lipid metabolism Middle Aged Lipid Metabolism Bicycling Protein catabolism Glucose Endocrinology Physical Endurance Female Energy Metabolism Anaerobic exercise |
| Zdroj: | International Journal of Sports Medicine. 10:311-316 |
| ISSN: | 1439-3964 0172-4622 |
| DOI: | 10.1055/s-2007-1024920 |
| Popis: | UNLABELLED Eight elite triathlon athletes participated in a laboratory study of the effects of endurance exercise on protein and energy metabolism. The study consisted of 3 h of cycling and 5 h of treadmill running; 3.5 h before beginning the exercise, a primed constant infusion of 1-13C leucine and 6,6(-2)H glucose was begun. Serial blood samples were collected during the rest and exercise periods for isotopic analysis. Respiratory gas exchange was determined every half hour. RESULTS the subjects exercised at an average of 53% +/- 3% of peak VO2. During the 8-h exercise period there was a decline in glucose utilization and an increase in lipid oxidation. For the first part of the exercise, most of the glucose oxidized was of muscle origin. Hepatic glucose production increased with exercise from 20 g/h to a maximum of about 60 g/h after 4 h of exercise and then decreased toward the pre-exercise rate. The plasma urea concentration was unchanged during the study. The leucine flux decreased during the first 4 h of exercise and then attained a new plateau about 20% lower than the pre-exercise value indicating an adaptive reduction in protein turnover. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|