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Average and standard variation of HRV (Heart Rate Variability)
HF : high frequency, HRV : heart rate variability, LF : lower frequency, LF/HF ratio : LF/HF component ratio, MHR : mean heart rate, PSI : Physical Stress Index, RMSSD : square root of the mean of sum of the square of differences between adjacent NN intervals, SDNN : standard deviation normal to normal, TP : total power, VLF : very lower frequency
