The intracellular to extracellular proton gradient following maximal whole body exercise and its implication for anaerobic energy production

Stefanos Volianitis, N H Secher, Bjørn Quistorff

    7 Citationer (Scopus)

    Abstract

    Maximal exercise elicits systemic acidosis where venous pH can drop to 6.74 and here we assessed how much lower the intracellular value (pH(i)) might be. The wrist flexor muscles are intensively involved in rowing and (31)P-magnetic resonance spectroscopy allows for calculation of forearm pH(i) and energy metabolites at high time resolution. Arm venous blood was collected in seven competitive rowers (4 males; 72 +/- 5 kg; mean +/- SD) at rest and immediately after a "2,000 m" maximal rowing ergometer effort when hemoglobin O(2) saturation decreased from 51 +/- 4 to 29 +/- 9% and lactate rose from 1.0 +/- 0.1 to 16.8 +/- 3.6 mM. Venous pH and pH(i) decreased from 7.43 +/- 0.01 to 6.90 +/- 0.01 and from 7.05 +/- 0.02 to 6.32 +/- 0.19 (P <0.05), respectively, while the ratio of inorganic phosphate to phosphocreatine increased from 0.12 +/- 0.03 to 1.50 +/- 0.49 (P <0.05). The implication of the recorded intravascular and intracellular acidosis and the decrease in PCr is that the anaerobic contribution to energy metabolism during maximal rowing corresponds to 4.47 +/- 1.8 L O(2), a value similar to that defined as the "accumulated oxygen deficit". In conclusion, during maximal rowing the intracellular acidosis, expressed as proton concentration, surpasses approximately 4-fold the intravascular acidosis, while the resting gradient is approximately 2.
    OriginalsprogEngelsk
    TidsskriftEuropean Journal of Applied Physiology
    Vol/bind109
    Udgave nummer6
    Sider (fra-til)1171-7
    Antal sider7
    ISSN1439-6319
    DOI
    StatusUdgivet - 1 aug. 2010

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