Table 3.
Heart Rate and HRV in Different Phases of the Dialytic Cycle
| HRV Measure | Phase 1 N=323; n=26 T=12.4 | Phase 2 N=480; n=26 T=18.5 | Phase 3 N=2554; n=28 T=91.2 | Phase 4 N=438; n=27 T=16.2 | Phase 5 N=428; n=28 T=15.3 | Phase 6 N=135; n=26 T=5.2 | Phase 7 N=221; n=4 T=55.3 | Phase 8 N=15; n=3 T=5 | Within ANOVA P |
|---|---|---|---|---|---|---|---|---|---|
| Heart rate (SD), bpm | 74.1 (11.3) | 81.3 (13.4) | 77.2 (12.2) | 75.9 (11.5) | 77.6 (14.1) | 73.9 (12.2) | 70.8 (8.0) | 71.0 (5.4) | <0.0001 |
| SD between | 10.4 | 11.3 | 10.1 | 10.3 | 12.9 | 13.2 | 9.8 | 5.3 | |
| SD within | 6.1 | 7.6 | 7.7 | 6.0 | 6.0 | 4.4 | 4.3 | 3.1 | |
| rMSSD (SD), ms | 12.6 (7.8) | 9.7 (5.2) | 11.0 (6.4) | 11.1 (6.7) | 11.1 (5.6) | 11.8 (5.6) | 11.3 (4.1) | 9.2 (2.3) | <0.0001 |
| SD between | 6.1 | 3.7 | 4.1 | 5.2 | 3.7 | 4.3 | 2.7 | 2.1 | |
| SD within | 4.6 | 3.7 | 5.1 | 5.1 | 4.4 | 4.2 | 3.6 | 1.7 | |
| HF power (SD), s2 | 4.6 (2.0) | 4.1 (1.8) | 4.3 (1.9) | 4.4 (2.0) | 4.5 (2.0) | 4.6 (2.2) | 5.8 (2.2) | 5.1 (2.9) | <0.0001 |
| SD between | 1.5 | 1.3 | 1.4 | 1.5 | 1.5 | 1.7 | 1.9 | 2.9 | |
| SD within | 1.3 | 1.4 | 1.4 | 1.4 | 1.3 | 1.4 | 1.4 | 0.9 | |
| LF power (SD), s2 | 3.1 (1.0) | 3.0 (1.0) | 3.1 (1.0) | 2.9 (0.9) | 3.0 (1.0) | 3.0 (1.0) | 3.1 (1.0) | 3.0 (0.8) | 0.068 |
| SD between | 0.6 | 0.6 | 0.6 | 0.5 | 0.6 | 0.7 | 0.8 | 0.3 | |
| SD within | 0.8 | 0.8 | 0.8 | 0.8 | 0.8 | 0.8 | 0.8 | 0.7 | |
| LF/HF ratio (SD) | 0.82 (0.46) | 0.89 (0.48) | 0.87 (0.46) | 0.84 (0.45) | 0.84 (0.47) | 0.80 (0.43) | 0.66 (0.39) | 0.88 (0.58) | 0.006 |
| SD between | 0.36 | 0.36 | 0.35 | 0.37 | 0.36 | 0.33 | 0.37 | 0.61 | |
| SD within | 0.27 | 0.31 | 0.32 | 0.32 | 0.29 | 0.26 | 0.24 | 0.16 | |
| Poincaré SD1 (SD), ms | 9.0 (5.6) | 6.9 (3.7) | 7.8 (4.6) | 7.9 (4.8) | 7.8 (4.0) | 8.4 (3.9) | 8.0 (2.9) | 6.5 (1.6) | <0.0001 |
| SD between | 4.3 | 2.6 | 2.9 | 3.7 | 2.6 | 3.0 | 1.9 | 1.5 | |
| SD within | 3.3 | 2.6 | 3.6 | 3.6 | 3.1 | 2.9 | 2.6 | 1.2 | |
| Poincaré SD2 (SD), ms | 25.8 (18.7) | 21.6 (15.9) | 23.8 (18.4) | 23.7 (17.2) | 22.4 (16.5) | 24.4 (16.5) | 20.3 (15.3) | 23.5 (17.0) | 0.002 |
| SD between | 15.2 | 11.1 | 14.9 | 19.6 | 12.1 | 12.5 | 13.7 | 16.6 | |
| SD within | 11.1 | 11.6 | 13.5 | 11.4 | 12.2 | 10.7 | 10.1 | 7.4 | |
| SD12 (SD), % | 0.44 (0.25) | 0.42 (0.25) | 0.43 (0.24) | 0.43 (0.27) | 0.46 (0.28) | 0.45 (0.27) | 0.56 (0.33) | 0.47 (0.32) | 0.461 |
| SD between | 0.20 | 0.19 | 0.19 | 0.20 | 0.20 | 0.20 | 0.34 | 0.33 | |
| SD within | 0.16 | 0.17 | 0.18 | 0.20 | 0.19 | 0.18 | 0.20 | 0.12 | |
| Sample Entropy (SD) | 1.49 (0.40) | 1.39 (0.46) | 1.39 (0.44) | 1.43 (0.44) | 1.42 (0.44) | 1.43 (0.47) | 1.52 (0.43) | 1.25 (0.62) | 0.0004 |
| SD between | 0.25 | 0.26 | 0.21 | 0.24 | 0.23 | 0.29 | 0.23 | 0.73 | |
| SD within | 0.35 | 0.40 | 0.39 | 0.38 | 0.37 | 0.38 | 0.38 | 0.30 | |
| Renyi entropy (SD) | 1.31 (0.31) | 1.33 (0.28) | 1.31 (0.30) | 1.33 (0.29) | 1.31 (0.31) | 1.29 (0.31) | 1.23 (0.33) | 1.30 (0.36) | 0.758 |
| SD between | 0.17 | 0.13 | 0.09 | 0.17 | 0.12 | 0.15 | 0.13 | 0.31 | |
| SD within | 0.27 | 0.26 | 0.29 | 0.27 | 0.29 | 0.28 | 0.31 | 0.24 |
bpm indicates beats per minute; HRV, heart rate variability; N, number of epochs; n, number of participants; rMSSD, root mean square of the successive normal sinus to normal sinus intervals differences; SD1, Poincaré plot SD perpendicular the line of identity; SD2, Poincaré plot SD along the line of identity; T, average number of hours.