[Effect of tobacco smoking on plasma sodium, potassium and chloride concentrations and some parameters of acid-base equilibrium during physical exertion and in the course of restitution].

In 30 healthy men, aged 20-24 years, the effect of physical exercise on the concentration of Na and K in serum erythrocyte and whole blood, on the serum chloride concentration and on capillary blood acid-base equilibrium was studied (Group A). In another group of 20 men the same studies were performed after smoking of 4 cigarettes (Group B). Taking into consideration blood condensation plasma Na, K and Cl concentrations were found to be decreased significantly (p less than 0.05). Sodium concentration in erythrocytes increased significantly after exericse in group B as compared with group A (p less than 0.01). Similarly, potassium concentration in erythrocyte increased significantly 30 minutes after exercise in group B as compared with group A (p less than 0.005). There were no differences in changes in acid-base equilibrium after exercise between both groups--they indicated the shift towards metabolic acidosis.