influence of biological maturation on fat and carbohydrate metabolism during exercise in males

This study examined substrate use during exercise in early-pubertal (EP), mid-pubertal (MP), late-pubertal (LP), and young-adult (YA) males. Fuel use was calculated using the RER and VO2 response during cycling exercise at 30 to 70% of VO2peak. Significant group by intensity interactions were found...

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Bibliographic Details
Published in:International journal of sport nutrition and exercise metabolism 2006-04, Vol.16 (2), p.166-179
Main Authors: Stephens, B.R, Cole, A.S, Mahon, A.D
Format: Article
Language:English
Subjects:
Adolescent
adolescents
Adult
Aging - metabolism
Aging - physiology
Analysis of Variance
Basal Metabolism
bicycling
blood chemistry
boys
carbohydrate metabolism
Child
Cross-Over Studies
Dietary Carbohydrates - metabolism
Dietary Fats - metabolism
Energy Metabolism - physiology
exercise
Exercise - physiology
Humans
lactic acid
lipid metabolism
Male
men
Oxygen Consumption - drug effects
Oxygen Consumption - physiology
Puberty - metabolism
Puberty - physiology
senescence
sports nutrition
young adults
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Summary:This study examined substrate use during exercise in early-pubertal (EP), mid-pubertal (MP), late-pubertal (LP), and young-adult (YA) males. Fuel use was calculated using the RER and VO2 response during cycling exercise at 30 to 70% of VO2peak. Significant group by intensity interactions were found for lactate, RER, percent CHO, and fat use, in addition to fat and CHO oxidation rates, which suggest a maturation effect on substrate use during exercise. While significance was not achieved at all intensities, post hoc analyses revealed greater fat use, lower CHO use, and lower lactate concentrations in EP and MP compared to LP or YA. No differences were noted between EP and MP or LP and YA at any intensity, suggesting the development of an adult-like metabolic profile occurs between mid- to late-puberty and is complete by the end of puberty.
ISSN:1526-484X
1543-2742
DOI:10.1123/ijsnem.16.2.166