Progressive decrease of intramyocellular accumulation of H+ and Pi in human skeletal muscle during repeated isotonic exercise

Copenhagen Muscle Research Center and Nuclear Magnetic Resonance Center, The Panum Institute, University of Copenhagen, Copenhagen DK-2100, Denmark The purpose of this study was to evaluate the hypotheses that accumulation of hydrogen ions and/or inorganic phosphate (Pi) in skeletal muscle increases...

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Bibliographic Details
Published in:American Journal of Physiology: Cell Physiology 2003-06, Vol.284 (6), p.C1490-C1496
Main Author: Rico-Sanz, J
Format: Article
Language:English
Subjects:
Adenosine Triphosphate - metabolism
Animals
Exercise - physiology
Female
Humans
Hydrogen-Ion Concentration
Isotonic Contraction - physiology
Magnetic Resonance Imaging
Muscle, Skeletal - metabolism
Phosphates - metabolism
Phosphocreatine - metabolism
Protons
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Summary:Copenhagen Muscle Research Center and Nuclear Magnetic Resonance Center, The Panum Institute, University of Copenhagen, Copenhagen DK-2100, Denmark The purpose of this study was to evaluate the hypotheses that accumulation of hydrogen ions and/or inorganic phosphate (Pi) in skeletal muscle increases with repeated bouts of isotonic exercise. 31 P-Magnetic resonance spectroscopy was used to examine the gastrocnemius muscle of seven highly aerobically trained females during four bouts of isotonic plantar flexion. The exercise bouts ( EX1 - 4 ) of 3 min and 18 s were separated by 3 min and 54 s of complete rest. Muscle ATP did not change during the four bouts. Phosphocreatine (PCr) degradation during EX1 (13.3 ± 2.4 mmol/kg wet weight) was higher ( P  
ISSN:0363-6143
1522-1563
DOI:10.1152/ajpcell.00419.2002