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The 24-h cycle averaged over the entire recording period of 4 days. (A) Mean heart rate data in beats per minute (bpm) of patients (red) and controls (black). Clear group differences can be observed. (B) Mean RMSSD in milliseconds (ms) for patients (red) and controls (black). (C) Simulation of the regression line fitted to the data for heart rate (HR). (D) Simulation of the regression line fitted to the data for root mean square of successive differences (RMSSD).
