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The kinetics of blood lactate in boys during and following a single and repeated all-out sprints of cycling are different than in men
Karlsruhe Inst Technol, Inst Sports & Sports Sci, Res Ctr Sch Sports & Phys Educ Children & Adolesc, D-76131 Karlsruhe, Germany.
Univ Wurzburg, Dept Sport Sci, D-97082 Wurzburg, Germany.
Karlsruhe Inst Technol, Inst Sports & Sports Sci, D-76131 Karlsruhe, Germany.
Karlsruhe Inst Technol, Inst Sports & Sports Sci, D-76131 Karlsruhe, Germany.
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2015 (English)In: Applied Physiology, Nutrition and Metabolism, ISSN 1715-5312, E-ISSN 1715-5320, Vol. 40, no 6, p. 623-631Article in journal (Refereed) Published
Abstract [en]

This study characterized the impact of high-intensity interval training on the kinetics of blood lactate and performance in trained boys and men. Twenty-one boys (11.4 +/- 0.8 years) and 19 men (29.4 +/- 5.0 years) performed a set of four 30-s sprints with 2-min of rest and a single 30-s sprint on 2 separate occasions (randomized order) with assessment of performance. Blood lactate was assayed after each sprint and during 30 min of recovery from both tests. The individual time-curves of blood lactate concentration were fitted to the biexponential function as follows: [LA](t) = [LA](0) + A(1) (1 - e(-gamma 1t)) +A(2) (1 - e (-gamma 2t)), where the velocity parameters gamma(1) and gamma(2) reflect the capacity to release lactate from the previously active muscle into the blood and to subsequently eliminate lactate from the organism, respectively. In both tests, peak blood lactate concentration was significantly lower in the boys (four 30-s sprints: 12.2 +/- 3.6 mmol.L-1; single 30-s sprint: 8.7 +/- 1.8 mmol.L-1) than men (four 30-s sprints: 16.1 +/- 3.3 mmol.L-1; single 30-s sprint: 11.5 +/- 2.1; p < 0.001). The boys exhibited faster gamma(1) (1.4531 +/- 0.65 min; p < 0.001) and gamma(2) (0.059 +/- 0.023 min; p = 0.01) in the single 30-s sprint and faster gamma(2) (0.049 +/- 0.016 min; p = 0.01) in the four 30-s sprints. The worsening of performance from the first to the last of the four 30-s sprints was less pronounced in boys (9.2% +/- 13.9%) than men (19.2% +/- 11.5%; p = 0.01). In the present study boys, when compared with men, exhibited lower Peak blood lactate concentration; less pronounced decline in performance during the sprints concomitantly with more rapid release and elimination during the single 30-s sprint; and faster elimination of lactate following the four 30-s sprints.

Place, publisher, year, edition, pages
2015. Vol. 40, no 6, p. 623-631
Keywords [en]
high intensive interval training, children, elimination, recovery
National Category
Sport and Fitness Sciences
Identifiers
URN: urn:nbn:se:miun:diva-25643DOI: 10.1139/apnm-2014-0370ISI: 000355327700012PubMedID: 25942632Scopus ID: 2-s2.0-84930150632OAI: oai:DiVA.org:miun-25643DiVA, id: diva2:849453
Available from: 2015-08-28 Created: 2015-08-18 Last updated: 2017-12-04Bibliographically approved

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Holmberg, Hans-Christer

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