Changes in Plasma Electrolytes and Muscle Substrates During Short-Term Maximal Exercise in Humans
| Autor: | Jean-Aimé Simoneau, O. Serresse, Germain Thériault, Claude Bouchard, Marcel R. Boulay, Thomas M. K. Song |
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| Rok vydání: | 1995 |
| Předmět: |
Adult
Blood Glucose Glycerol Male medicine.medical_specialty Hyperkalemia Physiology Physical Exertion Blood volume Electrolyte Electrolytes chemistry.chemical_compound Adenosine Triphosphate Body Water Chlorides Internal medicine medicine Humans Orthopedics and Sports Medicine Muscle Skeletal Blood Volume Glycogen Sodium Skeletal muscle Hemoconcentration medicine.disease Surgery medicine.anatomical_structure Endocrinology chemistry Exercise Test Lactates Potassium medicine.symptom Hypervolemia |
| Zdroj: | Canadian Journal of Applied Physiology. 20:89-101 |
| ISSN: | 1066-7814 |
| DOI: | 10.1139/h95-007 |
| Popis: | This study compared the effects of 3 short-term maximal exercise tests lasting 10, 30, and 90 sec upon blood volume, plasma electrolytes, glucose, glycerol, lactate and skeletal muscle ATP, PC, glycogen, and lactate concentrations. Seven sedentary male subjects were recruited and 5 of them were randomly assigned to each of the 3 protocols. The tests were performed on a modified ergocycle at workloads of 0.9, 0.075, and 0.05 kp∙kg−1 body mass, respectively. Muscle biopsies were taken from the vastus lateralis before and immediately after each exercise. Venous blood samples were collected before, immediately after, and during the recovery (5, 20, 60, and 120 min). Plasma volume decreased during the 30- and 90-sec tests and was increased in all tests after 60 min of recovery. Plasma K+ increased during all tests and returned to normal values 5 min postexercise, except after the 90-sec test where it fell below resting values. Plasma Na+ and Cl− were unaffected. Blood lactate increased in all tests, glucose increased after the 90-sec test, and glycerol increased after the 30- and 90-sec tests. All 3 tests brought relatively similar changes in muscle ATP, PC, and glycogen while muscle lactate changes were related to exercise duration. These results suggest that a normal hydration status is important for a subject undergoing short training bouts, and that high-intensity tests of short duration do not require a special nutritional regimen to enhance glycogen reserves. Key words: skeletal muscle, hemoconcentration, hypervolemia, hyperkalemia |
| Databáze: | OpenAIRE |
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