Figure 3. Heart rate variables of Chronic Heart Failure Subjects during testing. (A) heart rate in bpm; (B) R-R intervals in ms; (C) RMSSD index in ms; (D) SDNN in ms. *p<0.05. Kruskall-Wallis test with Dunn's post-hoc. IR-R: R-R intervals of electrocardiogram signals; RMSSD: The square root of the mean of the sum of the squares of differences between adjacent NN intervals; SDNN (ms): standard deviation of R-R intervals in ms; SB: spontaneous breath; CPAP: continuous positive airway pressure.
