Robust homeostatic control of quadriceps pH during natural locomotor activity in man 1 J. A. L. JENESON 2 and F. J. BRUGGEMAN * Department of Physiology, Division of Pathobiology, School of Veterinary Medicine, Utrecht University, Utrecht, the Netherlands; and * Department of Molecular Cell Physiology, BioCentrum, Vrije Universiteit, Amsterdam, the Netherlands 2 Correspondence: Department of Physiology, Division of Pathobiology, School of Veterinary Medicine, Androclus gebouw, Yalelaan 1, 3508 TD, Utrecht, the Netherlands. E-mail: j.jeneson@vet.uu.nl <h3>SPECIFIC AIMS</h3> It is generally thought that intracellular pH (pH i ) of skeletal muscle falls at least 0.5 units during intense activity, but all evidence on natural [i.e., voluntary, two-legged (2L)] locomotor exercise in humans has come from invasive biopsy studies. To provide the missing in vivo data, we collected 31 P NMR spectroscopic data on the energetics and homeostatic pH i control of human quadriceps muscle during and after incremental bicycling exercise to exhaustion. <h3>PRINCIPAL FINDINGS</h3> <h3>1. Intracellular pH of human quadriceps muscle falls linearly and no more than 0.2 units during incremental bicycling exercise to exhaustion</h3> We measured 31 P nuclear magnetic resonance amplitudes and frequencies at 1.5 Tesla of phosphocreatine (PCr), inorganic phosphate (P i ), and ATP in the
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Robust homeostatic control of quadriceps pH during natural locomotor activity in man
JENESON, J. A. L.; BRUGGEMAN, F. J.
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, Volume 18 (9): 1010
Fed of American Socs for Experimental Biology – Jun 1, 2004
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