Table 2 Descriptive statistics for absolute HRV metrics across different measurement points and conditions. Data are presented either in mean ± standard deviations or median [25th;75th percentile]. SDNN (standard deviation of NN intervals), HR (heart rate), RMSSD (root mean square of successive differencess), PNN50% (percentage of successive NN intervals that Ddffer by more than 50 ms), VLF (very low frequency), LF l(ow frequency), HF (high frequency), TP (total power), LFnu (low frequency normalized units), HFnu (high frequency normalized units).
Measure A | Measure B | Measure C | Measure D | Measure E | |
|---|---|---|---|---|---|
Supine | |||||
SDNN (ms) | 63.8 [47.6;82.4] | 60 [42;86.5] | 66.6 [45.8;94.3] | 62 [51.7;84.8] | 57.9 [47.2;75.4] |
HR (bpm) | 54.7 [50.7;61.1] | 57.7 [52.3;63.2] | 55 [50.4;60.8] | 55.7 [51;63.8] | 59.1 [54;67.6] |
RMSSD (ms) | 51.3 [33.2;81] | 56.7 [35.4;88.3] | 58.3 [34.7;107] | 50.5 [35.6;86.5] | 48.7 [31.2;74.2] |
PNN50% | 29.5 [9.5;53.2] | 33 [12.1;60.1] | 38.8 [13.4;62.7] | 27.4 [16.8;50.6] | 29.2 [8.7;51.7] |
VLF (ms2) | 1067.3 [507.9;2423] | 515.4 [292.5;1462.9] | 1141.4 [466.2;1525.5] | 1066.6 [639.2;2505.8] | 907.1 [585.4;1538.8] |
LF (ms2) | 1047.2 [468.1;2039.4] | 1044 [409;3403.7] | 1066.4 [466.9;2150.3] | 952.3 [602.4;2302.5] | 818.7 [462;1419.3] |
HF (ms2) | 793.6 [389.6;1620.2] | 965.9 [471.8;2731.8] | 834.3 [500.9;2938.2] | 856.5 [379.4;1881.8] | 869.3 [502.4;1637.7] |
LF/HF | 1.1 [0.6;2.5] | 1.1 [0.5;3.1] | 1 [0.5;2.1] | 1.4 [0.7;2.3] | 0.9 [0.5;3.2] |
LF + HF (ms2) | 1980.6 [1149.5;4154.6] | 3042.1 [1273.9;5908.7] | 2551.8 [968.2;6088.9] | 2396.6 [1177.6;4041.1] | 1970.3 [975.9;3574] |
TP (ms2) | 2684 [2092.2;6406.1] | 3627.7 [1642.4;6840.4] | 4090.1 [1908.5;9417.2] | 4014.4 [2099.3;6031.3] | 3130.9 [1795.5;5818.6] |
HF/HR | 13.6 [7;27.9] | 17.2 [6.8;52] | 12.7 [7.4;55.8] | 13.6 [6.5;31.7] | 15 [6.4;33.6] |
LF + HF/HR | 32.4 [21.7;76.4] | 39.7 [19.6;103.6] | 44.1 [14.5;129.5] | 37.7 [21;73.7] | 34.9 [15.7;63.3] |
LFnu | 53.5 [36.4;71.1] | 53.1 [32;74.2] | 48.7 [32.2;67.5] | 58.3 [40.7;69.8] | 46.9 [31.4;75.9] |
HFnu | 46.5 [28.9;63.6] | 46.9 [25.8;68] | 51.3 [32.5;67.8] | 41.7 [30.2;59.3] | 53.1 [24.1;68.6] |
Standing | |||||
SDNN (ms) | 55.3 ± 25 | 44.4 ± 19.2 | 50.8 ± 22.4 | 49.5 ± 18.5 | 43.4 ± 17.7 |
HR (bpm) | 80 [77;93] | 77.9 [69.2;84.3] | 79.4 [70.4;83.5] | 86.4 [76.1;91.2] | 80.2 [71.5;88.6] |
RMSSD (ms) | 19.4 [13.5;25] | 17.1 [13.6;25.5] | 19.5 [14.5;29.6] | 15.8 [11.3;25.2] | 17.4 [12.4;23.6] |
PNN50% | 2.3 [0.3;4.3] | 0.9 [0;5.3] | 2.4 [0.3;7.4] | 1.4 [0.1;4.7] | 1.5 [0;4.1] |
VLF (ms2) | 833.3 [445;1729.3] | 585 [329;1137.5] | 869.4 [268.1;1216.5] | 740 [515.5;1539.6] | 435 [259.8;869] |
LF (ms2) | 1433.2 [508.4;2190.6] | 713.6 [238.2;1123.7] | 661.9 [342.5;1773.6] | 1076.8 [515.6;2478.4] | 507.7 [292.3;1065.3] |
HF (ms2) | 116.7 [62.5;226.2] | 137 [62.9;207.6] | 160.3 [101.4;263.3] | 85.7 [45.9;173.1] | 103.2 [78.9;230.9] |
LF/HF | 11.2 [5.9;17.7] | 5.3 [2.1;12.7] | 3.7 [2.7;9.8] | 13.6 [8.3;20] | 4.8 [3;7.6] |
LF + HF (ms2) | 1483 [637.4;2445] | 1028.8 [356.2;1258.2] | 906.6 [498;2036.4] | 1184.1 [613.6;2611.5] | 659.9 [355;1310.1] |
TP (ms2) | 2765 [1166.9;4423.7] | 1422.9 [773;2548.4] | 1970.4 [997.3;3450.7] | 2537.9 [1162.2;3899.3] | 1196.1 [751.1;2469.6] |
LF/HR | 17.5 [6.2;28] | 9 [3.3;17.4] | 9.1 [3.7;21.7] | 13.1 [6.3;30.2] | 6.9 [3.4;13.6] |
LFnu | 91.8 [85.4;94.7] | 84 [67.4;92.7] | 78.7 [72.7;90.7] | 93.2 [89.3;95.2] | 82.7 [74.7;88.4] |
HFnu | 8.2 [5.3;14.6] | 16 [7.3;32.6] | 21.3 [9.3;27.3] | 6.8 [4.8;10.7] | 17.3 [11.6;25.3] |
