Universität zu Köln

Kappenstein, J., Ferrauti, A., Runkel, B., Fernandez-Fernandez, J., Mueller, K. and Zange, J. (2013). Changes in phosphocreatine concentration of skeletal muscle during high-intensity intermittent exercise in children and adults. Eur. J. Appl. Physiol., 113 (11). S. 2769 - 2780. NEW YORK: SPRINGER. ISSN 1439-6327

Full text not available from this repository.

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 31 Phosphorous-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 Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Kappenstein, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Ferrauti, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Runkel, B. UNSPECIFIED UNSPECIFIED UNSPECIFIED Fernandez-Fernandez, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Mueller, K. UNSPECIFIED UNSPECIFIED UNSPECIFIED Zange, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-473117
DOI:	10.1007/s00421-013-2712-x
Journal or Publication Title:	Eur. J. Appl. Physiol.
Volume:	113
Number:	11
Page Range:	S. 2769 - 2780
Date:	2013
Publisher:	SPRINGER
Place of Publication:	NEW YORK
ISSN:	1439-6327
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language OXYGEN-UPTAKE KINETICS; MAGNETIC-RESONANCE-SPECTROSCOPY; WINGATE ANAEROBIC TEST; REPEATED CYCLING SPRINTS; MODERATE-INTENSITY; ENZYME-ACTIVITIES; SHORT-TERM; P-31 NMR; IN-VIVO; RECOVERY Multiple languages Physiology; Sport Sciences Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/47311