Analysis of Heart Rate Variability(HRV) Proper Names
Analysis of Heart Rate Variability(HRV) Proper Names
  • MEAN (ms):
    The time average of RR-intervals.
  • SDNN (ms):
    Standard deviation of all the normal to normal (NN) intervals.
  • RMSSD (ms):
    The square root of the mean of the sum of the squares of differences between adjacent NN intervals.
  • NN50:
    Number of pairs of adjacent NN intervals differing by more than 50ms in the entire recording; three variants are possible counting all such NN intervals pairs or only pairs in which the first or the second interval is longer.
  • pNN50 (%):
    NN50 count divided by the total number of NN intervals.
  • SD1:
    Standard deviation of the scatter distribution along the direction perpendicular to the y=x line.
  • SD2:
    Standard deviation of the scatter distribution parallel to the y=x line.
  • FFT spectrum:
    Fast Fourier transform spectrum.
  • Auto-Regression Model:
    is a very common model for time series. That is representation of a type of random process. It specifies that the output variable depends linearly on its own previous values.
  • VLF: Very low frequency.
    LF: Low frequency.
    HF: High frequency.
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  • AR Model:
    Order range (1~99).
  • AR spectrum:
    Auto-regressive power spectrum.
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