Are signs and symptoms in cardiovascular rehabilitation correlated with heart rate variability? An observational longitudinal study

Aim To analyze the correlation between the appearance of signs/symptoms during a cardiovascular rehabilitation program and linear indexes of the heart rate variability (HRV) at rest. Methods To carry out the present observational longitudinal study, 48 patients were analyzed. The protocol was divided into two stages. First, the patients had their personal details collected, and the autonomic modulation at rest was evaluated by HRV. Second, they underwent 36 sessions of the cardiovascular rehabilitation program to evaluate signs/symptoms. Then, just for analysis of the data, they were divided into two groups: the group without signs/symptoms (n = 26; 65.15 ± 9.7 years); and the group with signs/symptoms (n = 22; 66.77 ± 14.4 years). The HRV indexes were compared by ancova. The effect size was measured through the partial eta‐squared. Pearson's and Spearman's correlations (P 50 ms (pNN50), high‐frequency spectral component (HF) varying from 0.15 to 0.4 Hz (expressed as ms2), dispersion of the points perpendicular to the line of identity and represents the instantaneous record of the beat‐to‐beat variability (SD1) and SD1/scatter of points along the identity line and represents the HRV in long‐term records (SD2) index presented a negative correlation with the appearance of signs/symptoms. When the linear regression was applied, the rMSSD, SD1 and SD1/SD2 showed negative values of β (P