Table 2.
Shows correlation coefficient values between respiration rate and time domain parameters of HRV. Correlation between SDNN and parasympathetic parameters RMSSD, pNN50 and Delta HR was significantly very high during all stages of LSKY and C5, P*** = <0.001
| S. No. | Correlation with respiration rate (RR) | All stages of LSKY | C1 (P1, P2, P3) | C2 (P1 Rest, P2 Rest, P3 Rest) | C4 (B1 Rest, B2 Rest, B3 Rest) | C5(Cyclic rhythmic breathing) | C6 (R1, R2, R3,R4) |
| 1 | RR & RMSSD | −0.81*** | 0.38 | −0.81 | 0.55 | −0.91*** | −0.67 |
| 2 | RR & SDNN | −0.69*** | 0.57 | −0.24 | 0.44 | −0.70*** | −0.35 |
| 3 | RR & pNN50 | −0.66*** | −0.41 | −0.77 | 0.39 | −0.89*** | 0.07 |
| 4 | RR & Delta HR | −0.71*** | 0.21 | −0.66 | 0.26 | −0.68*** | −0.46 |
| Correlation with SDNN | |||||||
| 6 | SDNN & RMSSD | 0.80*** | 0.97 | 0.99 | 0.99 | 0.84*** | 0.925 |
| 7 | SDNN & pNN50 | 0.62*** | 0.50 | 0.80 | 0.99 | 0.79*** | 0.75 |
| 8 | SDNN & Delta HR | 0.93*** | 0.92 | 0.88 | 0.98 | 0.94*** | 0.63 |
| Correlation with RMSSD | |||||||
| 10 | RMSSD & pNN50 | 0.88*** | 0.68 | 0.99*** | 0.98 | 0.96*** | 0.57 |
| 11 | RMSSD & Delta HR | 0.75*** | 0.98 | 0.97*** | 0.95 | 0.86*** | 0.67 |
| 12 | pNN50 & Delta HR | 0.56*** | 0.79 | 0.98 | 0.99 | 0.82*** | −0.00 |