Table 4.
Mean and standard deviation for time-domain indices between before and after the postural change maneuver in the music protocol
| Index | Seated rest | Music | 0-5 min | 5-10 min | 10-15 min | p |
|---|---|---|---|---|---|---|
| SDNN (ms) |
44.2±14 |
53.7±16 |
50.2±14 |
47.6±11 |
46.2±9 |
0.580 |
| RMSSD (ms) |
35.7±15 |
37.4±15 |
24.9±9 |
*21.7±7 |
22.5±6 |
0.023 |
| pNN50 (%) | 16.9±16 | 17.7±15 | 7.2±7 | *4.1±4 | 4.6±4 | 0.030 |
*Different from Music. N=12.
Legend: SDNN standard deviation of normal-to-normal R-R intervals, pNN50 the percentage of adjacent RR intervals with a difference of duration greater than 50 ms, RMSSD root-mean square of differences between adjacent normal RR intervals in a time interval, ms millisecond.