Determination of energy expenditure during heavy exercise, normal daily activity, and sleep using the doubly-labelled-water (2H2 18O) method
| Autor: | M. L. O'Toole, W. D. B. Hiller, T. P. Stein, R. G. Settle, R. W. Hoyt |
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| Rok vydání: | 1987 |
| Předmět: |
Adult
Male Calorie Energy transfer Physical Exertion Respiratory gas exchange Medicine (miscellaneous) Physical exercise Urine Oxygen Isotopes Animal science Body Water Activities of Daily Living Humans Morning Nutrition and Dietetics Hydrogen compounds business.industry Chemistry Deuterium Circadian Rhythm Energy expenditure Energy Metabolism Sleep Nuclear medicine business |
| Zdroj: | The American Journal of Clinical Nutrition. 45:534-539 |
| ISSN: | 0002-9165 |
| DOI: | 10.1093/ajcn/45.3.534 |
| Popis: | Energy expenditure of four subjects was measured by the doubly-labelled-water (2H2 18O) method to determine if energy expenditure could be determined over short periods. Three subjects were studied while they performed 8 h of heavy exercise in a laboratory environment. Urine and blood samples were taken before and after exercise. Estimated energy expended during 8 h of high-intensity exercise (55% VO2 max) for three subjects was 757 +/- 118 kcal/h by the doubly-labelled-water method using urine and a two-point calculation, which compared favorably with 735 +/- 82 kcal/h obtained by respiratory gas exchange. For the fourth subject, daytime, nighttime, and daily energy expenditure was calculated by both the two-pair method and decay-curve analysis of urine and saliva samples collected in the morning and at night. Daytime and nighttime energy expenditures differed significantly (p less than 0.05). |
| Databáze: | OpenAIRE |
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