Table 4.
HRV parameters under paced breathing: spectral analysis
| Parameter | Paced breathing
|
|
|---|---|---|
| HRV biofeedback n=24 | Control n=24 | |
| Baseline | ||
| HF (ms2) | 1,565.4 (±1,440.9) | 898.8 (±1,160.3) |
| LF (ms2) | 4,795.8 (±4,030.1) | 3,649.6 (±4,627.0) |
| TP (ms2) | 7,024.2 (±6,344.5) | 4,989.0 (±5,902.0) |
| Postintervention | ||
| HF (ms2) | 1,071.3 (±1,277.2) | 774.5 (±1,231.5) |
| LF (ms2) | 5,578.4 (±3,589.0) | 2,856.4 (±3,849.6) |
| TP (ms2) | 7,269.1 (±5,231.7) | 4,136.0 (±4,893.3) |
| Follow-up 1 | ||
| HF (ms2) | 868.6 (±734.2) | 871.0 (±1,894.9) |
| LF (ms2) | 5,008.0 (±3,532.7) | 3,382.0 (±6,886.9) |
| TP (ms2) | 6,476.6 (±4,611.0) | 4,981.0 (±9,385.2) |
| Follow-up 2 | ||
| HF (ms2) | 1,043.7 (±1,120.3) | 1,067.6 (±1,847.6) |
| LF (ms2) | 4,085.6 (±2,530.2) | 4,009.2 (±5,917.2) |
| TP (ms2) | 6,110.1 (±4,023.6) | 5,657.6 (±8,009.5) |
Notes: HRV was unchanged in both the control group and the biofeedback group. Data are expressed as mean±standard deviation. All HRV parameters were unchanged in both groups at each time point of assessment (p=ns). In the control group, the term “postintervention” refers to the post-control period.
Abbreviations: HF, high frequency; HRV, heart rate variability; LF, low frequency; TP, total power; ns, not significant.