Variation-pulsometric study of rabbits
The article describes the features of the tonus of autonomic nerve centers in male rabbits (Oryctolagus cuniculus) of Termond White breed. For this purpose, an electrocardiografic study was performed for all animals. The received data enabled to conduct a mathematical analysis of the variability of R-R cardio intervals, defining such indicators as mode, mode amplitude, variational range, etc.
The obtained results allowed to draw conclusions regarding the total tonus of the sympathetic and parasympathetic centers for each rabbit and, based on this, divide all the animals into three groups. The largest group, i.e. 70 % of the animals under experiment, was formed by sympathicotonic rabbits, which were characterized by the predominance of the tonus of sympathetic centers over that of the parasympathetic ones. In this group, the value of mode amplitude is the highest, while both mode and variation range are the lowest.
The second group included normotonic rabbits (19 %), which were characterized by a balanced sympathetic and parasympathetic tonus. That’s why most of the studied parameters are of the average value. The third group was the least numerous (11 %) and included parasympathetic rabbits in which the parasympathetic tonus dominated the sympathetic one. Animals were characterized by the highest values of mode and variational range and the smallest value of mode amplitude.
Such variation-pulsometric indicators as mode and variational rage correlate with the body weight of rabbits. To a certain extent, the nature of these relationships depends on the group of animals. The body weight reaches its largest values in parasympathetic rabbits. In the other two animal groups, it is smaller.
Variation-pulsometric indices are closely related to the heart rate, the highest values of which were observed in sympathicotonic rabbits, while average meanings referred to normotonic rabbit and the lowest values were found among parasympatheticotonic rabbits.
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