| Optimizing fat oxidation through exercise in severely obese Caucasian adolescents. | |
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MedLine Citation:
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PMID: 17590171 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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OBJECTIVE: To measure the contribution of substrate oxidation to energy expenditure during cycling at different workloads and to identify the exercise intensity that elicits the maximum fat oxidation rate in groups of severely obese or nonobese Caucasian adolescents. DESIGN: A total of 30 severely obese subjects (mean body mass index, BMI = 34.7 kg/m2; fat-mass = 39.9%) and 30 nonobese sedentary adolescents (mean BMI = 22.7 kg/m2; fat-mass = 21.8%) aged 14-16 years, participated in this study. Body composition was assessed by bioelectrical impedance. Peak oxygen uptake (VO2peak) and maximal fat oxidation rate were determined with indirect calorimetry by using a graded exercise test on an electromagnetically braked cycle ergometer. RESULTS: Predicted VO2max were expressed in absolute (l/min) and relative (ml/kg FFM/min) values, and maximal work rates were not significantly different between obese and nonobese adolescents, but were significantly higher in boys than in girls. No significant differences in fat oxidation rates were found in obese and nonobese sedentary adolescents during the graded exercise test. Maximal fat oxidation was observed at an exercise intensity corresponding to (mean +/- SD) 41 +/- 3%VO2max or 58 +/- 3% HRmax. At this exercise intensity, fat oxidation rates were higher in boys than in girls (0.32 +/- 0.02 g/min vs. 0.25 +/- 0.02 g/min, P < 0.001). CONCLUSIONS: Severely obese and sedentary nonobese adolescents reached maximal fat oxidation rates at 41%VO2max, which corresponds to 58% HRmax. At this exercise intensity, fat oxidation rates were higher in boys than in girls probably due to higher VO2max and absolute workload during the exercise steps for boys compared with those for girls. |
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Authors:
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Stefano Lazzer; Carlo Busti; Fiorenza Agosti; Alessandra De Col; Renzo Pozzo; Alessandro Sartorio |
Publication Detail:
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Type: Comparative Study; Journal Article; Research Support, Non-U.S. Gov't Date: 2007-06-21 |
Journal Detail:
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Title: Clinical endocrinology Volume: 67 ISSN: 0300-0664 ISO Abbreviation: Clin. Endocrinol. (Oxf) Publication Date: 2007 Oct |
Date Detail:
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Created Date: 2007-09-20 Completed Date: 2008-05-01 Revised Date: 2008-11-21 |
Medline Journal Info:
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Nlm Unique ID: 0346653 Medline TA: Clin Endocrinol (Oxf) Country: England |
Other Details:
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Languages: eng Pagination: 582-8 Citation Subset: IM |
Affiliation:
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Experimental Laboratory for Auxo-Endocrinological Research, Italian Institute for Auxology, IRCCS, Milan and Piancavallo (VB), Italy. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adipose Tissue
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metabolism* Adolescent Analysis of Variance Calorimetry, Indirect Carbohydrate Metabolism Case-Control Studies Energy Metabolism* European Continental Ancestry Group Female Heart Rate Humans Male Obesity / metabolism* Oxidation-Reduction Oxygen Consumption Physical Exertion / physiology* Sex Factors |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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