Fig. 4
From: Heart rate variability parameters indicate altered autonomic tone in subjects with COVID-19
Correlation between time-domain parameters (SDNN, RMSSD) and the nonlinear parameter (SD1) (top pannels) and correlation between high-frequency (HF) power (%) and time-domain/nonlinear parameters (SDNN, RMSSD, SD1) (bottom panels) for COVID-19 patients (red), healthy volunteers (blue), and CVD control patients (black). The correlation coefficients, ρ -values are displayed for each subject group: COVID-19 (ρcovid), healthy volunteers (ρhealthy), and CVD control (ρcvd).
