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Carbohydrate and fat metabolism related to blood lactate in boys and male adolescents

Beneke, Ralph and Hutler, Matthias and Leithäuser, Renate M (2009) 'Carbohydrate and fat metabolism related to blood lactate in boys and male adolescents.' European Journal Of Applied Physiology, 105 (2). pp. 257-263. ISSN 1439-6319

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Abstract

The half maximal constant (k (el)) of the relative rate of carbohydrate oxidation (relCHO) was individually approximated (relCHO = 100/(1 + k (el)/BLC(2)) as a function of the blood lactate concentration (BLC) in 11 pre-pubertal boys and 11 male adolescents (age: 11.6 +/- A 0.1 vs. 16.4 +/- A 0.2 years, height: 151.6 +/- A 1.7 vs. 182.4 +/- A 2.3 cm, body mass: 38.2 +/- A 1.1 vs. 68.7 +/- A 2.3 kg, all P < 0.001) during incremental cycle ergometry. k (el) explained 89.0 +/- A 2.2 and 91.9 +/- A 2.2% of the variance of the reliance on CHO in boys and adolescents respectively (both P < 0.001). No difference in k (el) [1.34 +/- A 0.40 vs. 1.48 +/- 0.30 (mmol l(-1))(2)] was found between boys and adolescents. The BLC was lower (P < 0.05) in boys when relCHO was higher than 91.2 +/- A 2.1 and 92.1 +/- A 1.3% in boys and adolescents respectively. This seems to explain why the reliance on CHO and the BLC are independent of maturation in the moderate and heavy exercise intensity domain and the BLC but not the relCHO which is higher under severe and maximal exercise conditions in more mature subjects.

Item Type: Article
Uncontrolled Keywords: Maturation; Age; Exercise; Aerobic; Anaerobic; Substrate
Subjects: Q Science > QH Natural history > QH301 Biology
Divisions: Faculty of Science and Health > Biological Sciences, School of
Depositing User: Jim Jamieson
Date Deposited: 23 Sep 2011 08:34
Last Modified: 16 Dec 2014 11:20
URI: http://repository.essex.ac.uk/id/eprint/777

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