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J Appl Physiol 87: 2151-2156, 1999;
8750-7587/99 $5.00
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Vol. 87, Issue 6, 2151-2156, December 1999

Skeletal muscle metabolism during short-term, high-intensity exercise in prepubertal and pubertal girls

S. R. Petersen1, C. A. Gaul2, M. M. Stanton1, and C. C. Hanstock3

1 Faculty of Physical Education and Recreation and 3 Department of Biomedical Engineering, University of Alberta, Edmonton, Alberta T6G 2H9; and 2 School of Physical Education, University of Victoria, Victoria, British Columbia, Canada V8W 2Y2

To test the hypothesis that glycolytic metabolism in muscle is attenuated in prepubertal children, 31P-magnetic resonance spectroscopy was used to determine calf muscle intracellular pH (pHi) in nine prepubertal (Pre) and nine pubertal female swimmers (Pub). Maximal plantar flexion work capacity (100% MWC) was established by using a graded exercise test. Between 5 and 10 days later, calf muscle images (magnetic resonance imaging) and phosphorus spectra were acquired at rest, during 2 min of light exercise (40% MWC), and during 2 min of supramaximal exercise (140% MWC) in a 3.0-T NMR system. End-exercise pHi was 6.66 ± 0.11 and 6.76 ± 0.17 for Pub and Pre, respectively. No significant differences in the mean values for pHi or the Pi-to-phosphocreatine ratio were observed between groups during the protocol; however, an interaction effect was found for the Pi-to-phosphocreatine ratio during the supramaximal exercise challenge. Cross-sectional area of gastrocnemius was 15.12 ± 0.46 and 9.37 ± 0.37 cm2 for Pub and Pre, respectively (P < 0.05). Differences in muscle size must be considered when interpreting the unlocalized magnetic resonance spectroscopy data. These results suggest that glycolytic metabolism in physically active children is not maturity dependent.

magnetic resonance spectroscopy; intracellular pH; anaerobic; maturation


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