Table 2.
Distribution characteristics (median; 25th, 75th percentile in parentheses) of the linear and nonlinear fHRV measures obtained for the different groups (entire population, Groups I, II and III). The parameters were calculated for the different HR sub-series (5, 3 and 2 min duration) separately. The number of total HR sub-series analyzed for each group is given in parentheses. The number of 3 and 2 min HR sub-series included in Groups I, II and III differ because the groups were defined separately for these HR sub-series.
| 5 min HR sub-series | ||||
|---|---|---|---|---|
| Entire population (46) | Group I (19) | Group II (20) | Group III (7) | |
| mHR (cpm) | 143 (140;147) | 142 (140;145) | 143 (138;147) | 152 (147;154) |
| SDNN (ms) | 17.6 (12.0;22.7) | 11.6 (9.6;12.7) | 21.1 (19.1;22.7) | 32.9 (27.9;35.6) |
| RMSSD (ms) | 5.1 (4.4;6.0) | 4.0 (2.7;5.0) | 5.9 (5.2;8.9) | 5.1 (4.7;8.2) |
| SDNN/RMSSD | 2.9 (2.6;4.0) | 2.8 (2.4;3.6) | 2.9 (2.6;3.8) | 5.5 (4.3;5.9) |
| Delta (ms) | 41.6 (31.6;62.5) | 31.6 (26.2;37.7) | 54.5 (37.4;65.7) | 75.7 (67.8;91.5) |
| STV (ms) | 6.0 (4.7;8.2) | 4.6 (3.9;5.3) | 7.3 (6.2;8.8) | 9.2 (7.8;10.4) |
| LTI (ms) | 23.8 (17.6;40.8) | 17.6 (15.0;19.9) | 30.9 (23.7;40.5) | 63.2 (57.1;67.1) |
| ApEn | 0.64 (0.56;0.84) | 0.79 (0.62;1.00) | 0.64 (0.55;0.80) | 0.51 (0.46;0.56) |
| SampEn | 0.54 (0.41;0.67) | 0.66 (0.50;0.95) | 0.55 (0.40;0.63) | 0.39 (0.35;0.44) |
| 3 min HR sub-series | ||||
|---|---|---|---|---|
| Entire population (92) | Group I (41) | Group II (42) | Group III (9) | |
| mHR (cpm) | 143 (139;147) | 143 (141;146) | 142 (138;146) | 150 (141;153) |
| SDNN (ms) | 15.9 (10.0;22.5) | 9.7 (8.1;11.3) | 20.3 (17.6;23.8) | 31.7 (31.0;33.3) |
| RMSSD (ms) | 4.8 (3.8;6.2) | 3.9 (2.8;4.6) | 5.7 (4.7;6.9) | 7.3 (5.4;8.2) |
| SDNN/RMSSD | 3.0 (2.3;3.8) | 2.4 (2.1;3.2) | 3.2 (2.7;4.1) | 4.9 (3.7;5.8) |
| Delta (ms) | 44.7 (30.7;66.9) | 29.8 (26.1;35.6) | 61.1 (50.1;71.6) | 87.3 (78.5;91.9) |
| STV (ms) | 6.0 (4.6;8.5) | 4.5 (3.8;4.8) | 7.6 (6.1;9.5) | 10.3 (7.7;14.5) |
| LTI (ms) | 23.5 (15.6;35.4) | 14.8 (12.7;18.8) | 30.4 (26.0;37.7) | 68.0 (55.4;73.7) |
| ApEn | 0.70 (0.55;0.87) | 0.84 (0.67;1.01) | 0.64 (0.52;0.78) | 0.52 (0.38;0.62) |
| SampEn | 0.59 (0.43;0.79) | 0.75 (0.57;1.34) | 0.52 (0.39;0.67) | 0.37 (0.25;0.54) |
| 2 min HR sub-series | ||||
|---|---|---|---|---|
| Entire population (92) | Group I (49) | Group II (34) | Group III (9) | |
| mHR (cpm) | 143 (139;147) | 143 (140;146) | 142 (138;148) | 146 (141;151) |
| SDNN (ms) | 14.5 (9.5;20.4) | 9.8 (8.2;12.4) | 19.1 (16.3;22.4) | 34.3 (31.4;38.2) |
| RMSSD (ms) | 4.8 (3.6;6.2) | 4.1 (3.2;5.0) | 5.1 (4.1;6.7) | 7.4 (6.4;15.3) |
| SDNN/RMSSD | 2.6 (2.2;4.0) | 2.2 (1.8;3.1) | 3.6 (2.6;4.7) | 4.6 (2.6;5.5) |
| Delta (ms) | 44.0 (30.3;61.2) | 30.8 (25.1;36.8) | 59.9 (50.4;68.3) | 94.2 (82.5;144.0) |
| STV (ms) | 5.7 (4.5;8.5) | 4.7 (3.5;5.4) | 7.5 (6.7;10.1) | 12.4 (11.2;14.0) |
| LTI (ms) | 23.5 (15.8;35.8) | 16.4 (12.7;19.8) | 34.0 (27.2;42.2) | 63.7 (51.9;73.7) |
| ApEn | 0.71 (0.56;0.87) | 0.85 (0.65; 0.93) | 0.64 (0.52;0.72) | 0.42 (0.38;0.48) |
| SampEn | 0.66 (0.43;1.13) | 1.02 (0.58;1.55) | 0.52 (0.42;0.68) | 0.32 (0.27;0.36) |