Table 1 Linear and Non-Linear Heart Rate Variability measurements selected in the current study.
From: Short term Heart Rate Variability to predict blood pressure drops due to standing: a pilot study
Measure | UNIT | Description | |
|---|---|---|---|
Time-Domain | |||
1 | MeanRR | ms | Mean of RR intervals |
2 | STDNN | ms | Standard deviation of RR (NN) intervals |
3 | RMSSD | ms | Square root of the mean squared differences between successive RR intervals |
4 | NN50 | count | Number of successive RR interval pairs that differ by more than 50 m |
5 | pNN50 | % | NN50 divided by the total number of RR intervals |
6 | HRVtri | Integral of the RR interval histogram divided by the height of the histogram | |
7 | TINN | Ms | Baseline width of the RR interval histogram |
Frequency-Domain | |||
8 | LF | ms2 | Absolute powers of LF band, calculated with AR |
9 | HF | ms2 | Absolute powers of HF band, calculated with AR |
10 | LF/HF | Ratio between LF and HF band powers | |
Nonlinear-Domain | |||
11 | SD1 | ms | Standard deviation of the Poincar´e plot perpendicular to the line of identity |
12 | SD2 | ms | Standard deviation of the Poincar´e plot along the line of identity |
13 | ApEn | Approximate entropy | |
14 | SampEn | Sample entropy | |
15 | D2 | Correlation Dimension | |
16 | DFA1 | Short-term fluctuation slope in Detrended Fluctuation Analysis | |
17 | DFA2 | Long-term fluctuation slope in Detrended Fluctuation Analysis | |
18 | RPLmean | beats | Recurrent Plot (RP) mean line length |
19 | RPLmax | beats | RP maximum line length |
20 | RPREC | % | RP Recurrence Rate |
21 | RPDET | % | RP Determinism |
22 | RPShan | RP Shannon Entropy | |