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

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dc.contributor.advisor Mahon, Anthony D. en_US
dc.contributor.author Stephens, Brooke R. en_US
dc.date.accessioned 2011-06-03T19:40:06Z
dc.date.available 2011-06-03T19:40:06Z
dc.date.created 2003 en_US
dc.date.issued 2003
dc.identifier LD2489.Z78 2003 .S74 en_US
dc.identifier.uri http://cardinalscholar.bsu.edu/handle/handle/187664
dc.description.abstract The purpose of this study was to examine the influence of biological maturation on the pattern of fat and carbohydrate metabolism during exercise in early-pubertal (EP), mid-pubertal (MP), and late-pubertal (LP) males. Nine boys, Tanner stage I (EP) (10.3 ±0.9 years), 12 boys, Tanner stage 2/3 (MP) (12.3 ± 1.9 years), and 11 boys, Tanner stage 4/5 (LP) (15.0 ± 0.8 years) were subjects. Maximal aerobic capacity (VO2max) was assessed and, on a separate day, 5, 5-minute exercise bouts on a cycle ergometer at 30, 40, 50, 60, and 70% Of VO2max were performed in a fasted state. Fuel use was calculated at each intensity using steady-state V02 and the respiratory exchange ratio (RER). A one-way ANOVA was used to analyze physical characteristics and maximal exercise responses between groups. A two-way (group x intensity) ANOVA was used to analyze responses during submaximal exercise. Statistical significance was set at p < 0.05. VO2max (ml•kg-l.min 1) was not different between groups. At each intensity, % VO2ma., was similar between groups (p > 0.05). Significant interactions were found for RER, carbohydrate utilization, % fat utilization, and lactate concentration. Post hoc analyses revealed that at all intensities, % fat use and fat oxidation rates were higher and carbohydrate use and carbohydrate oxidation rates were lower in MP versus LP. In comparison, between EP and LP, % fat use was higher and % carbohydrate use was lower at 50-60% of VO2max, while fat oxidation rate was higher in EP versus LP at 40, 50, and 60% of VO2max. The only differences between EP and MP were for % fat and carbohydrate use at 30% of VO2max. Lactate concentrations were also lower in EP and MP than in LP at intensities corresponding to 50, 60, and 70% of VO2m., while no differences were observed between EP and MP at any intensity. The lack of a significant difference in substrate utilization or lactate concentrations between EP and MP at the majority of exercise intensities, suggest that the development of an adult-like metabolic profile occurs in the transition from mid-puberty to late-puberty.
dc.description.sponsorship School of Physical Education
dc.format.extent vi, 79 leaves : ill. ; 28 cm. en_US
dc.source Virtual Press en_US
dc.subject.lcsh Metabolism -- Testing. en_US
dc.subject.lcsh Exercise for children. en_US
dc.title The influence of biological maturation on fat and carbohydrate metabolism during exercise in boys en_US
dc.description.degree Thesis (M.S.)
dc.identifier.cardcat-url http://liblink.bsu.edu/catkey/1260630 en_US


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  • Master's Theses [5510]
    Master's theses submitted to the Graduate School by Ball State University master's degree candidates in partial fulfillment of degree requirements.

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