Table 3.
Summary of test-retest reliability of heart rate variability for each duration (5-min, 10-min, 1-h, 3-h, 6-h and 24-h) in all participants (n = 45).
| SDNN (ms) | RMSSD (ms) | HF (ms2) | LF (ms2) | VLF (ms2) | ULF (ms2) | TP (ms2) | |
|---|---|---|---|---|---|---|---|
| ICC (95% CI) | |||||||
| 5-min | 0.34 (0.05–0.57) | 0.72 (0.54–0.83) | 0.54 (0.30–0.72) | 0.40 (0.13–0.62) | NA | NA | 0.48 (0.22–0.68) |
| 10-min | 0.43 (0.15–0.64) | 0.76 (0.60–0.86) | 0.65 (0.45–0.79) | 0.60 (0.37–0.76) | 0.16 (−0.17–0.43) | NA | 0.22 (−0.08–0.48) |
| 1-h | 0.46 (0.19–0.66) | 0.74 (0.58–0.85) | 0.60 (0.37–0.76) | 0.76 (0.61–0.86) | 0.64 (0.43–0.79) | 0.06 (−0.23–0.35) | 0.30 (0.01–0.54) |
| 3-h | 0.72 (0.54–0.84) | 0.77 (0.62–0.87) | 0.60 (0.37–0.76) | 0.81 (0.68–0.89) | 0.77 (0.62–0.87) | 0.70 (0.51–0.82) | 0.74 (0.57–0.85) |
| 6-h | 0.83 (0.70–0.90) | 0.89 (0.81–0.94) | 0.77 (0.62–0.87) | 0.88 (0.79–0.93) | 0.86 (0.76–0.92) | 0.81 (0.67–0.89) | 0.84 (0.73–0.91) |
| 24-h | 0.82 (0.69–0.90) | 0.91 (0.85–0.95) | 0.80 (0.66–0.88) | 0.89 (0.80–0.94) | 0.92 (0.86–0.95) | 0.82 (0.69–0.89) | 0.84 (0.73–0.91) |
| CV (%) | |||||||
| 5-min | 48.8 | 43.7 | 140.2 | 104.6 | NA | NA | 100.4 |
| 10-min | 49.2 | 40.6 | 132.1 | 93.1 | 144.1 | NA | 125.5 |
| 1-h | 32.0 | 40.6 | 99.2 | 67.8 | 56.3 | 123.2 | 75.1 |
| 3-h | 23.1 | 35.7 | 94.9 | 64.4 | 52.7 | 76.2 | 53.3 |
| 6-h | 17.0 | 25.7 | 52.9 | 40.6 | 39.3 | 53.1 | 38.9 |
| 24-h | 15.7 | 14.9 | 42.4 | 30.4 | 21.0 | 42.5 | 34.8 |
| 95% LoA | |||||||
| 5-min | ±1.01 x̄ | ±0.93 x̄ | ±1.68 x̄ | ±1.51 x̄ | NA | NA | ±1.49 x̄ |
| 10-min | ±1.01 x̄ | ±0.89 x̄ | ±1.65 x̄ | ±1.43 x̄ | ±1.69 x̄ | NA | ±1.62 x̄ |
| 1-h | ±0.74 x̄ | ±0.89 x̄ | ±1.49 x̄ | ±1.24 x̄ | ±1.11 x̄ | ±1.62 x̄ | ±1.31 x̄ |
| 3-h | ±0.56 x̄ | ±0.80 x̄ | ±1.46 x̄ | ±1.20 x̄ | ±1.06 x̄ | ±1.31 x̄ | ±1.07 x̄ |
| 6-h | ±0.43 x̄ | ±0.62 x̄ | ±1.07 x̄ | ±0.89 x̄ | ±0.87 x̄ | ±1.06 x̄ | ±0.85 x̄ |
| 24-h | ±0.40 x̄ | ±0.39 x̄ | ±0.91 x̄ | ±0.71 x̄ | ±0.52 x̄ | ±0.92 x̄ | ±0.79 x̄ |
CI confidence interval, CV coefficient of variation, HF high frequency power, ICC intraclass correlation coefficient, LF low frequency power, LoA limits of agreement, NA Not applicable, RMSSD root mean square of successive differences between normal heartbeats, SDNN standard deviation of all normal-to-normal R-R intervals, TP total power, ULF ultra-low frequency power, VLF very low frequency power, x̄ data mean.