| Fat oxidation rate and the exercise intensity that elicits maximal fat oxidation decreases with pubertal status in young male subjects. | |
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MedLine Citation:
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PMID: 18535137 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The range of exercise intensities that elicit high fat oxidation rates (FOR) in youth and the influence of pubertal status on peak FOR are unknown. In a longitudinal design, we compared FOR over a range of exercise intensities in a small cohort of developing prepubertal male subjects. Five boys all at Tanner stage 1 (ages 11-12 yr) and nine men (ages 20-26 yr) underwent an incremental cycle ergometry test to volitional exhaustion. FOR curves were determined from indirect calorimetry during the final 30 s of each increment. The same protocol was duplicated annually in the boys as they progressed through puberty. The peak FOR was considerably higher (P<0.05) in boys at Tanner 1 (8.6+/-1.5 mg.kg lean body mass(-1).min(-1)) (mean+/-SD) compared with men (4.2+/-1.1 mg.kg lean body mass(-1).min(-1)). FOR dropped as boys developed through puberty (Tanner 2/3 peak rate=7.6+/-0.6 mg.kg lean body mass(-1).min(-1); Tanner 4 peak rate=5.4+/-1.8 mg.kg lean body mass(-1).min(-1), main effect of Tanner stage; P<0.05) to the levels found in men (not significant). The exercise intensity that elicited peak FOR was higher in the boys at Tanner 1 [56+/-6% peak aerobic power (VO2 peak)] than in men (31+/-4% VO2 peak) (P<0.001). This value tended to decrease by Tanner stage 4 (45+/-10% VO2 peak, main effect of Tanner stage; P=0.06). We conclude that, compared with men, prepubertal boys have higher relative FOR throughout a wide range of exercise intensities and that FOR drops as boys develop through puberty. |
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Authors:
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M C Riddell; V K Jamnik; K E Iscoe; Brian W Timmons; N Gledhill |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2008-06-05 |
Journal Detail:
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Title: Journal of applied physiology (Bethesda, Md. : 1985) Volume: 105 ISSN: 8750-7587 ISO Abbreviation: J. Appl. Physiol. Publication Date: 2008 Aug |
Date Detail:
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Created Date: 2008-08-05 Completed Date: 2008-10-10 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8502536 Medline TA: J Appl Physiol Country: United States |
Other Details:
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Languages: eng Pagination: 742-8 Citation Subset: IM |
Affiliation:
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School of Kinesiology and Health Science, Faculty of Health, York University, 4700 Keele St., Toronto, ON, Canada M3J 1P3. mriddell@yorku.ca |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adolescent Adult Aging / physiology Anaerobic Threshold / physiology Body Composition / physiology Calorimetry, Indirect Carbohydrate Metabolism / physiology Carbon Dioxide / metabolism Child Cohort Studies Exercise / physiology* Humans Kinetics Lipid Metabolism / physiology* Longitudinal Studies Male Oxidation-Reduction Puberty / physiology* |
| Chemical | |
Reg. No./Substance:
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124-38-9/Carbon Dioxide |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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