Table 3.
HRV indices in sitting position and during RSA-m
| Time | COPD (n = 12)
|
COPD+OSAS (n = 12)
|
Group | Maneuver | Interaction | ||
|---|---|---|---|---|---|---|---|
| Sitting | RSA-m | Sitting | RSA-m | ||||
| iRR | 773 ± 113 | 757 ± 89 | 815 ± 116 | 802 ± 98 | 0.15 | 0.62 | 0.95 |
| SDNN | 14.4 ± 6.1 | 26 ± 16.2* | 17.3 ± 7.1 | 34.8 ± 20.3* | 0.15 | 0.00 | 0.46 |
| RMSSD | 13.2 ± 5.1 | 19.9 ± 19.5 | 17.1 ± 8.1 | 22.7 ± 13.6 | 0.37 | 0.10 | 0.87 |
| pnn50 | 0.4 ± 0.9 | 4.1 ± 11.9 | 1.9 ± 3.4 | 4.6 ± 8.5 | 0.64 | 0.15 | 0.81 |
| TINN | 70 ± 29.1 | 123.7 ± 83.0* | 87.5 ± 35.3 | 160 ± 87.2* | 0.15 | 0.00 | 0.61 |
Notes:
*
Significant difference between sitting position and RSA-m. The variables are presented as mean ± SD.
Abbreviations: HRV, heart rate variability; RSA-m, respiratory sinus arrhythmia maneuver; COPD, chronic obstructive pulmonary disease; OSAS, obstructive sleep apnea syndrome; iRR, interval between consecutive heart beats; SDNN, standard deviation of all R-R intervals; RMSSD, square root of the mean squared differences between adjacent R-R intervals; pnn50, percentage of adjacent R-R intervals with duration difference greater than 50 ms; TINN, triangular interpolation of the iRR interval histogram.