Table 1.
Summary statistics of heart rate and cardiovascular variability indices in the two baseline conditions and during the subsequent relaxing (Rel) and activating (Act) musical stimulation.
| Variable | Rel Baseline |
Rel Stimulation |
Act Baseline |
Act Stimulation |
|---|---|---|---|---|
| HR, bpm | 73.4 ± 2.2 | 72.2 ± 2.1 | 73.5 ± 2.1 | 73.3 ± 2.1 |
| SDNN, ms | 42.8 ± 2.6 | 40.9 ± 2.5 | 44.7 ± 3.2 | 40.3 ± 2.8 |
| RMSSD, ms | 30.8 ± 2.2 | 33.0 ± 2.3 | 35.0 ± 3.4 | 30.3 ± 2.7 |
| pNN50, % | 11.7 ± 2.6 | 14.1 ± 2.6 | 12.6 ± 2.7 | 11.1 ± 2.5 |
| LFpower, ms2 | 559 ± 87 | 644 ± 108 | 712 ± 144 | 512 ± 105 |
| LFNUr, N.U. | 51.7 ± 4.4 | 50.5 ± 4.2 | 53.9 ± 4.7 | 53.2 ± 4.1 |
| HFpower, ms2 | 443 ± 65 | 519 ± 59 | 479 ± 90 | 408 ± 62 |
| LF/HF, A.U. | 1.51 ± 0.26 | 1.37 ± 0.22 | 1.78 ± 0.34 | 1.51 ± 0.22 |
| BRS, ms/mm Hg | 6.0 ± 0.6 | 7.0 ± 0.7 | 6.3 ± 0.6 | 5.9 ± 0.5 |
Summary statistics are expressed as mean ± SEM. HR = mean heart rate; SDNN = standard deviation of normal-to-normal RR intervals; RMSSD = root mean square of successive squared differences of NN intervals; pNN50 = proportion of interval differences of successive NN intervals greater than 50 ms; LFpower = low frequency power; HFpower = high frequency power; LFNU = low frequency power in normalized units; LF/HF = LFpower/HFpower; A.U. = arbitrary units; BRS: baroreflex sensitivity.