Table 3.
HRV indices obtained from PolarH7 and ECG data (n = 67).
| PolarH7 | ECG | p | ES | ||
|---|---|---|---|---|---|
| SREST | PLF (e−4) | 9.78 (3.88 to 24.74) | 9.76 (3.85 to 24.78) | 0.074 | 0.155 |
| PHF (e−4) | 5.77 (2.30 to 10.91) | 5.74 (2.22 to 10.84) | 0.067 | 0.159 | |
| MHR (bpm) | 62.55 (53.25 to 71.95) | 62.84 (53.36 to 72.00) | <0.001 * | 0.378 | |
| SDNN (ms) | 60.27 (40.50 to 75.22) | 60.28 (40.33 to 75.26) | 0.570 | 0.049 | |
| RMSSD (ms) | 39.48 (22.48 to 60.04) | 39.26 (22.39 to 60.66) | 0.336 | 0.083 | |
| SCY60 | PLF (e−4) | 1.17 (0.62 to 2.01) | 1.17 (0.65 to 2.23) | 0.112 | 0.137 |
| PHF (e−4) | 0.51 (0.26 to 1.29) | 0.86 (0.44 to 2.07) | <0.001 * | 0.419 | |
| MHR (bpm) | 106.00 (100.45 to 112.91) | 106.66 (100.75 to 113.17) | <0.001 * | 0.433 | |
| SDNN (ms) | 15.94 (12.06 to 20.77) | 16.21 (12.85 to 20.32) | 0.010 * | 0.222 | |
| RMSSD (ms) | 6.48 (4.34 to 8.51) | 8.38 (5.67 to 10.65) | <0.001 * | 0.482 | |
| SCY70 | PLF (e−4) | 0.45 (0.21 to 0.87) | 0.46 (0.22 to 0.88) | 0.851 | 0.016 |
| PHF (e−4) | 0.30 (0.15 to 0.55) | 0.41 (0.24 to 0.75) | <0.001 * | 0.377 | |
| MHR (bpm) | 124.24 (115.77 to 130.89) | 124.32 (115.76 to 130.92) | <0.001 * | 0.482 | |
| SDNN (ms) | 10.22 (8.19 to 12.93) | 10.48 (8.40 to 13.10) | 0.001 * | 0.280 | |
| RMSSD (ms) | 3.74 (2.96 to 4.91) | 4.37 (3.64 to 6.68) | <0.001 * | 0.443 | |
| SCY80 | PLF (e−4) | 0.13 (0.09 to 0.23) | 0.18 (0.10 to 0.26) | <0.001 * | 0.364 |
| PHF (e−4) | 0.23 (0.14 to 0.36) | 0.37 (0.25 to 0.66) | <0.001 * | 0.362 | |
| MHR (bpm) | 141.01 (130.62 to 148.81) | 141.09 (130.69 to 149.05) | <0.001 * | 0.451 | |
| SDNN (ms) | 8.11 (6.20 to 9.92) | 8.10 (6.34 to 10.65) | <0.001 * | 0.378 | |
| RMSSD (ms) | 2.90 (2.32 to 3.90) | 3.75 (3.16 to 5.52) | <0.001 * | 0.405 | |
| SREC | PLF (e−4) | 4.75 (1.83 to 10.25) | 4.59 (1.88 to 9.97) | 0.881 | 0.015 |
| PHF (e−4) | 2.06 (0.65 to 4.71) | 2.12 (0.82 to 4.70) | 0.308 | 0.102 | |
| MHR (bpm) | 99.76 (90.76 to 112.15) | 98.39 (90.12 to 111.35) | 0.002 * | 0.268 | |
| SDNN (ms) | 33.11 (23.27 to 58.30) | 33.67 (23.04 to 57.40) | 0.094 | 0.147 | |
| RMSSD (ms) | 12.87 (7.65 to 23.78) | 12.90 (7.99 to 23.32) | 0.603 | 0.046 |
Values are expressed as median and interquartile range. Segments are based on the test phases: resting (SREST), cycling (SCY) and recovery (SREC). SCY was divided in three stages at 60, 70 and 80% of HRmax, denoted as SCY60, SCY70 and SCY80, respectively. PLF = low-frequency power; PHF = high-frequency power; MHR = mean HR; SDNN = SD of the NN intervals; RMSSD = root mean square of successive differences between NN intervals. ES = Effect size. * = Significant differences between devices (p ≤ 0.05, Wilcoxon test for paired samples).