V originále
The correlation between baroreflex sensitivity (BRS) and the component of spectrum at a frequency of 0.1Hz of pulse intervals (PI) and systolic blood pressure (SBP) was studied. SBP and PI of 51 subjects were recorded beat-to-beat at rest, during exercise and during recovery. BRS was determined by a spectral method. The subjects were divided into groups according to the spectral amplitude of SBP at a frequency of 0.1 Hz: very high (vh); high (h); middle (m), low (l). The 0.1 Hz variability of PI increased significantly with increasing BRS in each of the groups with the identical 0.1 Hz variability in SBP. This relationship was shifted to the lower values of PI variability at the same BRS with a decrease in SBP variability. The primary SBP variability increased during exercise. The interrelationship among the variability of SBP, PI and BRS was identical at rest and during exercise. During exercise, the increasing primary variability in SBP due to sympathetic activation was present.
In Czech
Studovali jsme korelace mezi baroreflexní citlivostí (BRS) a komponentou spektra tepových intervalů (TI) a systlického tlaku (STK) při frekvenci 0,1 Hz. STK a TI 51 subjektů byly zaznamenávány tep po tepu v klidu, během zátěže a během restituce. BRS bylo stanoveno spektrální analýzou. Subjekty byly rozděleny do skupin podle velikosti amplitudy STK při frekvenci 0,1 Hz: velmi vysoká (vv); vysoká (v); střední (s), nízká (n). Variabilita TI při 0,1 Hz významně narůstá se vzestupem BRS v každé podskupně s identickou úrovni variability STK. Tento vztah byl při stejném BRS posunut k nižším hodnotám variability TI s poklesem STK variability. Variability STK se během zátěže zvýšila. Vztah mezi variabilitou STK, variabilitou TI a BRS je identický jak v klidu tak během zátěže.