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Changes in phosphocreatine concentration of skeletal muscle during high-intensity intermittent exercise in children and adults

Kappenstein, Jennifer and Ferrauti, Alexander and Runkel, B. and Fernandez-Fernandez, J. and Müller, K. and Zange, J. (2013) Changes in phosphocreatine concentration of skeletal muscle during high-intensity intermittent exercise in children and adults. European Journal of Applied Physiology, pp. 2769-2779. Springer. DOI: 10.1007/s00421-013-2712-x ISSN 1439-6319

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Abstract

Purpose The aim of the present study was to test the hypotheses that a greater oxidative capacity in children results in a lower phosphocreatine (PCr) depletion, a faster PCr resynthesis and a lower muscle acidification during high-intensity intermittent exercise compared to adults. Methods Sixteen children (9.4 ± 0.5 years) and 16 adults (26.1 ± 0.3 years) completed a protocol consisting of a dynamic plantar flexion (10 bouts of 30-s exercise at 25 % of one repetition maximum separated by 20-s recovery), followed by 10 min of passive recovery. Changes of PCr, ATP, inorganic phosphate, and phosphomonoesters were measured by means of 31Phosphorous-magnetic resonance spectroscopy during and post-exercise. Results Average PCr (percentage of [PCr] at initial rest (%[PCr]i)) at the end of the exercise (adults 17 ± 12 %[PCr]i, children 38 ± 17 %[PCr]i, P\0.01) and recovery periods (adults 37 ± 14 %[PCr]i, children 57 ± 17 %[PCr]i, P\0.01) was significantly lower in adults compared to children, induced by a stronger PCr decrease during the first exercise interval (adults -73 ± 10 %[PCr]i, children-55 ± 15 %[PCr]i, P\0.01). End-exercise pH was significantly higher in children compared to adults (children 6.90 ? 0.20, -0.14; adults 6.67 ? 0.23, -0.15, P\0.05). Conclusions From our results we suggest relatively higher rates of oxidative ATP formation in children’s muscle for covering the ATP demand of high-intensity intermittent exercise compared to adults, enabling children to begin each exercise interval with significantly higher PCr concentrations and leading to an overall lower muscle acidification.

Item URL in elib:https://elib.dlr.de/85025/
Document Type:Article
Title:Changes in phosphocreatine concentration of skeletal muscle during high-intensity intermittent exercise in children and adults
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Kappenstein, JenniferRuhr-Universität-BochumUNSPECIFIED
Ferrauti, AlexanderRuhr-Universität-BochumUNSPECIFIED
Runkel, B.University of WuppertalUNSPECIFIED
Fernandez-Fernandez, J.Ruhr-Universität-BochumUNSPECIFIED
Müller, K.DLRUNSPECIFIED
Zange, J.DLRUNSPECIFIED
Date:August 2013
Journal or Publication Title:European Journal of Applied Physiology
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI :10.1007/s00421-013-2712-x
Page Range:pp. 2769-2779
Editors:
EditorsEmail
Westerblad, H.UNSPECIFIED
westerterp, K. R.UNSPECIFIED
Publisher:Springer
ISSN:1439-6319
Status:Published
Keywords:P-MRS, Intramuscular pH, Maturation, Muscle metabolism,� Recovery
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Research under Space Conditions
DLR - Research area:Raumfahrt
DLR - Program:R FR - Forschung unter Weltraumbedingungen
DLR - Research theme (Project):R - Vorhaben Systemphysiologie
Location: Köln-Porz
Institutes and Institutions:Institute of Aerospace Medicine > Space Physiology
Deposited By: Becker, Christine
Deposited On:15 Nov 2013 12:36
Last Modified:06 Sep 2019 15:25

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