Abstract

The principal part of the study was based on a selected training session performed under laboratory conditions. Basic parameters of the respiratory system heart rate, rectal temperature, degree of dehydration, hematocrit value, and plasma lactate concentration were analyzed. The values of the individual physiological parameters were interpreted as the indicators of work intensity and a result of workload duration. Pronounced differences were observed in the level of physiological responses recorded at the onset of steady state at the final stage of exercise. Increase of rectal temperature by 1.95 degrees C should be regarded as the strongest response to 30 min continuous running with 81 Vo2 max. Its consequence was progressive increase of heart rate (by 9.0 beats/min) and minute ventilation (by 11.1 l/min). At the higher delta Tr, the increase of VE was a result of increased respiratory frequency and an accompanying slight decrease of tidal volume. Gradual increase of oxygen consumption between 6 and 29 min of work was also observed, since Vo2 increase reached 3.7. Moreover, higher hyperthemia was found to be accompanied by lower reserve of heart rate demonstrated by an athlete at the terminal stage of workload. Verf.-Referat