Table 2.
Indexes of heart rate variability among women with moderate and severe fibromyalgia and healthy women
| Variable | Healthy women (n=17) | Moderate FM (n=15) | Severe FM (n=20) | P-value |
|---|---|---|---|---|
| Time domain | ||||
| RRi (ms) | 834.5±114.1 | 818.7±123.5 | 807.4±114.1 | 0.784 |
| SDNN (ms) | 32.3±12.9 | 25.6±10.2 | 23.8±9.3 | 0.057 |
| RMSSD (ms) | 30.1±12.8 | 21.9±11.1* | 21.1±10.3* | 0.044 |
|
| ||||
| Frequency domain | ||||
| lnLF (ms2) | 6.1±0.8 | 5.7±0.8 | 5.4±1.1 | 0.085 |
| lnHF (ms2) | 5.8±0.9 | 5.1±1.1* | 4.9±1.1* | 0.037 |
| LF (n.u.) | 65.3±12.1 | 60.7±19.1 | 57.9±13.1 | 0.406 |
| HF (n.u.) | 42.1±13.2 | 34.7±12.1 | 39.3±19.1 | 0.408 |
| LF/HF, median (IQR) | 1.6 (1.1) | 2.1 (1.4) | 1.9 (2.6) | 0.587 |
|
| ||||
| Poincaré plot | ||||
| SD1 (ms) | 21.3±9.1 | 15.6±7.8* | 14.8±6.9* | 0.038 |
| SD2 (ms) | 40.2±16.6 | 32.5±12.4 | 29.9±11.9 | 0.080 |
| SD1/SD2, median (IQR) | 1.9 (0.7) | 2.2 (0.6) | 1.9 (1.1) | 0.526 |
Values are the mean±standard deviation unless otherwise indicated.
RRi, R-R intervals; SDNN, standard deviation of consecutive RRi; RMSSD, root mean square of the successive differences between adjacent RRi; LF, low-frequency power; HF, high-frequency power; InLF, natural logarithm of low-frequency power; InHF, natural logarithm of high-frequency power; n.u., normalized units; IQR, interquartile range; SD1, standard deviation of the instantaneous beat-to-beat RRi variability; SD2, standard deviation of the continuous long-term RRi variability.
*
Significantly lower compared to healthy women (P<0.05).