For the analysis we used the Kubius HRV Analysis Version 2.0 software (Kuopio, Finland). From the choice of the most stable stretch of five minutes, HRV was analyzed in the time domain (TD) and the variables selected the RR interval, the square root square mean difference between normal adjacent iR-R expressed in milliseconds (RMSSD) and SDNN, in the frequency domain via LF, HF and LF / HF addition to the non-linear analysis with the contents SD1, SD2 and Shannon Entropy.