Abstract
The 2,3-diphosphoglycerate (2,3-DPG) concentration, oxygen half saturation pressure at pH 7.4 (P 50), pH in plasma and red cells, and mean corpuscular hemoglobin concentration (MCHC) of venous blood were determined during unrestricted daily activity (series I) throughout 24 hrs as well as during prolonged bed rest until noon (series II). In series I an almost synchronous diurnal behavior ofP 50, 2,3-DPG, and plasma pH as well as red cell pH became significantly apparent with highest values in the afternoon. The [2,3-DPG] yielded most pronounced alterations, which made up to 13.5% of the average day value. During prolonged recumbency the [2,3-DPG] showed a nonsignificant tendency to decline; theP 50 remained unchanged throughout that period. The possible reason for the missing [2,3-DPG] increase is a reduced change of red cell pH in series II. An influence of a posture dependent aldosterone secretion either directly on the 2,3-DPG metabolism or indirectly via mediating the red cell pH and thus ruling the formation of this organic phosphoris compound is discussed.
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Böning, D., Meier, U., Schweigart, U. et al. Diurnal changes of the 2,3-diphosphoglycerate concentration in human red cells and the influence of posture. Europ. J. Appl. Physiol. 34, 11–17 (1975). https://doi.org/10.1007/BF00999911
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DOI: https://doi.org/10.1007/BF00999911