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Influence of phosphagen concentration on phosphocreatine breakdown kinetics. Data from human gastrocnemius muscle

Department of Biomedical Sciences and Technologies and M.A.T.I. Centre of Excellence, University of Udine, Udine, Italy

Submitted 3 January 2008 ; accepted in final form 23 April 2008

At the onset of a square-wave exercise of moderate intensity, in the absence of any detectable lactate production, the hydrolysis of phosphocreatine (PCr) fills the gap between energy requirement and energy yield by oxidative pathways, thus representing a readily available source of energy for the muscle. We verified experimentally the relationships between high-energy phosphates and/or their changes and the time constant of PCr concentration ([PCr]) kinetics in humans (_PCr). High-energy phosphate concentration (by ³¹P-NMR spectroscopy) in the calf muscles were measured during three repetitions of the rest-to-work transition of moderate aerobic square-wave exercise on nine healthy volunteers, while resting [PCr] was estimated from the appropriate spectroscopy data. PCr concentration decreased significantly (22 ± 6%) from rest to steady-state exercise, without differences among the three repetitions. Absolute resting [PCr] and _PCr were consistent with literature values, amounting to 27.5 ± 2.2 mM and 23.9 ± 2.9 s, respectively. No significant relationships were detected between individual _PCr and mechanical power, fraction or absolute amount of PCr hydrolyzed, or change in ADP concentration. On the contrary, individual _PCr (s) was linearly related to absolute resting [PCr] (mM), the relationship being described by: _PCr = 0.656 + 0.841·[PCr] (n = 9, R = 0.708, P < 0.05). These data support the view that in humans PCr concentration sets the time course of the oxidative metabolism in skeletal muscle at the start of exercise, being one of the main controllers of oxidative phosphorylation.

mitochondrial respiration; ³¹P-NMR spectroscopy; work onset

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