Marathon running: physiological and chemical changes accompanying late-race functional deterioration
| Autor: | James W. Rogers, Robert Cade, Christian W. Zauner, Melvin J. Fregly, Norman Hommen, Donald R. Mars, David A. Kaufmann, John C. Peterson, Malcolm Privette, David Packer |
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| Rok vydání: | 1992 |
| Předmět: |
Adult
Blood Glucose Male medicine.medical_specialty Physiology Marathon running Energy metabolism Blood Pressure Sweating Plasma volume Body Temperature Running Electrolytes Physiology (medical) Internal medicine medicine Humans Insulin Orthopedics and Sports Medicine Exercise physiology Exercise Blood Volume Insulin blood Chemistry Public Health Environmental and Occupational Health Rectal temperature General Medicine Human physiology Endocrinology Physical performance Female human activities |
| Zdroj: | European journal of applied physiology and occupational physiology. 65(6) |
| ISSN: | 0301-5548 |
| Popis: | Twenty-one experienced runners were studied before, during and immediately after a marathon race to ascertain whether either depletion of energy substrate or rise in body temperature, or both, contribute to late-race slowing of running pace. Seven runners drank a glucose/electrolyte (GE) solution ad libitum (Na+ 21 mmol l-1, K+ 2.5 mmol l-1, Cl- 17 mmol l-1, PO4(2-) 6 mmol l-1, glucose 28 mmol l-1) throughout the race; 6 drank water and 8 drank the GE solution diluted 1:1 with water. Although average running speeds for the three groups were not significantly different during the first two-thirds (29 km) of the race, rectal temperature was significantly higher (P < 0.05) and reduction of plasma volume was greater (P < 0.05) in runners who replaced sweat losses with water. During the last one-third of the race, the average running pace of the water-replacement group slowed by 37.2%; the pace slowed by 27.9% in the 8 runners who replaced their sweat loss with GE diluted 1:1 with water (1/2 GE) and 18.2% in runners who replaced fluid loss with full-strength solution (GE). Eleven runners (5 in the water group, 4 in the 1/2 GE group and 2 in the GE group) lapsed into a walk/run/walk pace during the last 6 miles of the race. Ten of these had a rectal temperature of 39 degrees C or greater after 29 km of running, and plasma volume in these runners was reduced by more than 10%.(ABSTRACT TRUNCATED AT 250 WORDS) |
| Databáze: | OpenAIRE |
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