| 24-hour | Sleeping hours |
---|
 | Fibromyalgia | Controls |
P
value | Fibromyalgia | Controls |
P
value |
---|
Mean NN (ms) | 758.4 ± 70.9 | 796.5 ± 92.0 | 0.132 | 881.5 ± 94.8 | 915.6 ± 122.9 | 0.310 |
SDNN (ms) | 133.7 ± 28.7 | 152.6 ± 32.8 | 0.047 | 91.2 ± 21.5 | 122.2 ± 32.0 | 0.001 |
SDANN (ms) | 120.0 ± 28.1 | 132.5 ± 27.9 | 0.144 | 57.8 ± 19.2 | 83.2 ± 35.9 | 0.006 |
SDSD (ms) | 36.0 ± 13.9 | 47.3 ± 16.9 | 0.020 | 45.9 ± 19.6 | 56.9 ± 21.3 | 0.084 |
RMSSD (ms) | 36.0 ± 13.9 | 47.3 ± 16.9 | 0.020 | 45.9 ± 19.6 | 56.9 ± 21.3 | 0.084 |
pNN50 (%) | 13.6 ± 10.3 | 20.5 ± 11.6 | 0.045 | 23.9 ± 17.5 | 31.4 ± 17.5 | 0.160 |
- Holter recordings were analyzed for 24 hours, and during sleeping time (from 00.00 to 06.00 hours). Results are shown as mean ± standard deviation. Student's t test calculated the differences between fibromyalgia group and control group. Mean NN, mean NN interval; ms, milliseconds; pNN50, percentage of adjacent pairs of R-R intervals that differ by more than 50 ms from each other in a given time period; RMSSD, Square root of the mean of the squares of differences between adjacent NN intervals; SDANN, mean standard deviation of the average NN intervals calculated over 5 minutes; SDNN, standard deviation of the NN intervals; SDSD, standard deviation of the successive NN differences;