Resting metabolic rate and postprandial thermogenesis by level of aerobic fitness in young women
| Autor: | C M, Burke, R C, Bullough, C L, Melby |
|---|---|
| Rok vydání: | 1993 |
| Předmět: |
Adult
Analysis of Variance Adolescent Rest Body Weight Calorimetry Indirect Fasting Eating Cross-Sectional Studies Oxygen Consumption Adipose Tissue Follicular Phase Physical Fitness Body Composition Exercise Test Humans Female Basal Metabolism Energy Intake Energy Metabolism Body Temperature Regulation |
| Zdroj: | European journal of clinical nutrition. 47(8) |
| ISSN: | 0954-3007 |
| Popis: | Resting metabolic rate (RMR) and the thermic effect of a meal (TEM) were compared among women of three levels of aerobic fitness. Twenty-three euthyroid, eumenorrheic women (aged 18-35 years) were divided into three groups based on VO2 max standardized for fat-free weight (FFW), as determined from a graded exercise test: High Fit (HF): n = 7, VO2 max70 ml*kg FFW-1*min-1; Moderately Fit (MF): n = 8, VO2 max = 55-70 ml*kg FFW-1*min-1; and Low Fit (LF): n = 8, VO2 max55 ml*kg FFW-1*min-1). At 0700h RMR was measured for 1 h by indirect calorimetry with subjects in a fasted, preovulatory state, having refrained from exercise on the preceding day. The subject then consumed a liquid meal (12 kcal*kg FFW-1) and indirect calorimetry was continued for 3 h to determine the TEM. RMR adjusted for FFW using analysis of covariance was significantly higher (P0.05) in the HF group (mean +/- SEM = 1.08 +/- 0.03 kcal*min-1) compared to the MF (0.99 +/- 0.04) and LF (0.90 +/- 0.04) groups. Group differences in the thermic response did not reach statistical significance, although there was a trend for a high TEM in the HF group. There was a positive relationship between RMR and energy flux (average daily kcalorie intake + daily kcaloric expenditure in physical activity). These results suggest that women who exhibit high levels of exercise and aerobic fitness may be less energy efficient during the non-exercise portion of the day then their less active counterparts. |
| Databáze: | OpenAIRE |
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