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Comparison of HRV indicators, including mean heart rate (MeanHR), mean RR interval (MeanRR), standard deviation of RR intervals (SDNN), the baseline width of the RR interval histogram (TINN), the number of successive RR interval pairs that differ by > 50 ms divided by total number of RR (pNN50) and SD2 between groups. *p < 0.05, **p < 0.01, ***p < 0.001 for difference with Baseline vs. After and difference between groups in After.
