Uso do monitor cardíaco Polar ® V800 na mensuração da variabilidade da frequência cardíaca em gatos domésticos

Abstract

The heart rate variability (HRV) analysis is a noninvasive method for assessing autonomic modulation of cardiac activity. The control of depolarization of the seasonal node is dependent on the fluctuating balance of the sympathetic and parasympathetic system in the heart. Thus, the HRV analysis provides a means of monitoring the activity an autonomic nervous system (ANS) and can be indicative of stress/welfare state. Although the use the Polar ® heart rate monitor has been validated in humans, horses and dogs, there is no further information about its use in pet cats. This study aimed to evaluate the use of the Polar ® V800 human heart monitor for HRV analysis in domestic cats. Thirty castrated cats with an average weight of 4.26 ± 1.33 kg, healthy, vaccinated, aged between 5 months and 14 years, from private domestic homes were used. The animals were submitted to Polar ® model V800 frequency meter, and remained for 6 minutes in the lap of their tutors, 6 minutes in their home floor and 6 minutes in the transport box. After this time the device was removed and the animal released. RR interval data were always collected in the morning from 8:00 am to 12:00 am on three alternate days. The data were sent to the virtual platform Polar ® Flow and later to the program CardioSeries 2.4.1 ® that allowed the spectral analysis of the HRV. Two different settings were used for frequency domain analysis. Statistical analysis of HRV data was performed through two-way ANOVA for repeated measures, considering the factors: environment, day, age, and gender. Followed by Bonferroni Multiple Comparison Test. Analyzes and graphs were performed using GraphPad Prism 7. Comparing the two settings (LF 0,04-0,15 Hz; HF 0,15-0,70 Hz e LF 0,04-0,15 Hz; HF 0,15-0,80 Hz) to obtain the variables in the frequency domain, it was observed that there was no statistical difference between the results. Analyzing the environments lap, floor and transport box, it was noticed that the animals in the lap had HF and RMSSD values higher than in the other environments. It was also noted that in the transport box the values of HF and RMSSD were lower than in other environments. No significant differences were observed between the test days. The variables of HRV were different among the age groups of young, adult, and senior, the values of RMSSD and HF were higher in the group adult than others animals. No significant difference was detected between males and females. The present study may conclude that the use of the Polar ® V800 cardiac frequency meter was useful in obtaining iRR data for the analysis of HRV in domestic cats, thus providing a versatility in animal physiological research