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Heart Rate Variability (The Autonomic Nervous System (the part of the…

- - - - provides information about how power is distributed as a function of frequency
    - - high frequency band
      - low frequency band
      - very low frequency band
  - - - time domain measures are the simplest to calculate
        
        time domain measures do not provide a means to adequately quantify autonomic dynamics or determine the rhythmic or oscillatory activity generated by the different physiological control systems
    - - SDNN - the standard deviation of the normal-to-normal sinus initiated interbeat-intervals measured in milliseconds
      - RMSSD - the root mean square of successive differences between normal heartbeats
      - SDNN index - the mean of the standard deviations of all the normal-to-normal intervals for each five minute segment