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Biomedical subjects

J Stokłosa

Publications and source records attributed to J Stokłosa.

2 recordsLinked to original sources

The level of anaerobic threshold determined from the gas exchange and acid-base equilibrium of the blood in women and men.

The investigations were carried out on 6 female and 6 male students of the Physical Education Academy for determining the levels of anaerobic threshold on the ground of an analysis of the curves of respiratory parameters during exercise of increasing intensity, and in another set of experiments--on the ground of disturbances of acid-base equilibrium of the blood during submaximal exercise of nearly threshold intensity. Additionally it was tried to demonstrate possible differences in the AT level between females and males. The investigations showed that in the tests with acid-base equilibrium analysis the anaerobic threshold appeared in females at the level of 52% of VO2 max and in males at the level of 61%. In the tests with gas exchange analysis these levels were 58% in females and 67% in males. The differences in these results obtained by both methods of analysis were not significant statistically.

Acid-Base Equilibrium↗

Relationship between plasma volume reduction and plasma electrolyte changes after prolonged bicycle exercise, passive heating and diuretic dehydration.

Plasma volume was decreased by prolonged bicycle exercise, by passive heating in warm water, by sauna dehydration, and by diuretically induced dehydration in eleven well trained subjects. Blood samples from an arm vein were taken before and after this pre-treatment, as well as after a subsequent standard exercise test (SET) on a bicycle ergometer (50%, 70% and 105% of max VO2; the SET with no pre-treatment was used as a control condition. The changes in plasma concentration of Na+, K+ and Cl- were not proportional to the calculated plasma volume changes. The Na+ and Cl- concentrations always increased in the plasma, while plasma potassium concentration was increased after prolonged exercise, but decreased after the other types of dehydrations. The standard exercise test produced a pronounced fall in total calculated plasma potassium and in K+ concentration measured 3-5 min after exercise in all types of experiments. In the standard exercise test the calculated water loss from the plasma volume was relatively large. It amounted to about 2/3 of the total water loss in the standard exercise test and was independent of the pre-treatments.

Blood Volume↗