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Carbonic anhydrase (EC 4.2.1.1, CA) is a zinc metalloenzyme which reversibly catalyzes the hydration of carbon dioxide to bicarbonate and hydrogen ions; that is, CA plays an important role in gas transport and acid/base equilibrium1). In erythrocytes, CA isoenzymes have been designated as B type (CA-B) and C type (CA-C) according to immunochemical2,3) and genetic criteria3,4). Our recent studies5-7) showed that although the levels of CA-B and CA-B-dependent activity in human erythrocytes are decreased immediately after acute physical exercise, no significant changes occur in the levels of CA-C or CA-C-dependent activity, and that the active CA-B enzymes are converted in part to inactive enzymes during heavy physical exercise of short duration, possibly by decreased zinc binding. It is well known that sustained physical training regimens induce a relatively mild, apparently functional anemia8-10). This pseudoanemic condition has been termed '' sports anemia''11,12). In the present study, experiments on the effect of training on the levels of zinc and CA isoenzyme activities in human erythrocytes were performed. The possible significance of zinc and CA isoenzymes under heavy physical training of short duration is discussed in connection with the changes in hematocrit and hemoglobin (Hb) levers in the venous blood.

Effects of training of short duration on the levels of zinc and carbonic anhydrase isoenzymes in human erythrocytes.