Table 3.
Average values and their standard deviations for the analysis of the time domain, frequency domain and geometric HRV indices.
| Index | Control | Baroque Music | Heavy Metal Music | White Noise |
| RRTri | 13.2±4 | 12.1±3 | 11.8±3 | 12.4±4 |
| TINN | 214.6±63 | 205±22 | 177.1±56 | 211±95 |
| SD1 | 27.2±13 | 25.5±13 | 24.4±10 | 23.4±11 |
| SD2*1) | 61.3±21 | 54.1±22 | 63.4±35 | 55.6±21 |
| SD1/SD2*) | 0.44±0.12 | 0.46v0.13 | 0.42±0.15 | 0.42±0.14 |
| SDNN (ms) | 49±17 | 45.6±17 | 43.4±16 | 44.4±17 |
| RMSSD (ms) | 38.3±19 | 35±17 | 32.4±13 | 31.9±15 |
| pNN50 (%) | 19.2±16 | 15±15 | 13.1v12 | 12.1±13 |
| LF (ms2)) | 693.9±727 | 691.2±1109 | 692.4±923 | 717.8±655 |
| LF (nu) | 49.9±19 | 51.4±18 | 54.5±15 | 59.5±17 |
| HF (ms2)) | 785.1±739 | 723.9±811 | 513.9±459 | 534.4±550 |
| HF (nu) | 49.9±20 | 48.4±18 | 45.3±15 | 40.4±17*) |
| LF/HF | 1.6±1.8 | 1. 53±1.62 | 1.58±1.33 | 2.2±2 |
RRTri, triangular index; TINN, triangular interpolation of RR intervals; SD1, standard deviation of the instantaneous variability of the beat-to-beat heart rate; SD2, standard deviation of long-term continuous RR interval variability; SD1/SD2 ratio, ratio between the short- and long-term variations of RR intervals; SDNN, standard deviation of normal-to-normal R-R intervals; RMSSD, root-mean square of differences between adjacent normal RR intervals in a time interval; pNN50, percentage of adjacent RR intervals with a difference of duration greater than 50 ms; LF, low frequency; HF, high frequency; LF/HF, low-frequency/high-frequency ratio.
*p<0.05 vs. control.