Table 1.
Mean value ± standard deviation of indices measured from HRV and PRV data.
| Stage | Index | HRV | PRV | |||
|---|---|---|---|---|---|---|
| Finger | Toe | Ear canal | Earlobe | |||
| BM | SDNN (s) | 0.048 ± 0.02 | 0.057 ± 0.02 | 0.095 ± 0.07 | 0.109 ± 0.12 | 0.059 ± 0.02 |
| RMSSD (s) | 0.045 ± 0.02 | 0.075 ± 0.02 | 0.134 ± 0.10 | 0.156 ± 0.18 | 0.076 ± 0.03 | |
| pNN50 | 0.258 ± 0.20 | 0.339 ± 0.14 | 0.478 ± 0.19 | 0.464 ± 0.19 | 0.343 ± 0.16 | |
| LF (s2) | 527.5 ± 420.1 | 498.4 ± 244.6 | 3209.5 ± 6820.0 | 8910.4 ± 29673.2 | 534.4 ± 251.6 | |
| HF (s2) | 907.5 ± 928.3 | 1195.9 ± 742.0 | 4716.0 ± 6859.3 | 4399.0 ± 6505.8 | 1246.2 ± 835.5 | |
| TP (s2) | 2024.7 ± 1487.0 | 2103.6 ± 1149.5 | 8525.9 ± 13472.2 | 15964.3 ± 43563.8 | 2151.1 ± 1173.5 | |
| nLF (n.u.) | 0.293 ± 0.15 | 0.268 ± 0.11 | 0.276 ± 0.13 | 0.324 ± 0.13 | 0.289 ± 0.13 | |
| nHF (n.u) | 0.398 ± 0.14 | 0.555 ± 0.08 | 0.568 ± 0.12 | 0.527 ± 0.16 | 0.549 ± 0.13 | |
| LF/HF | 0.947 ± 0.85 | 0.506 ± 0.26 | 0.554 ± 0.42 | 0.887 ± 1.22 | 0.604 ± 0.48 | |
| SD1 (s) | 0.032 ± 0.01 | 0.053 ± 0.02 | 0.094 ± 0.07 | 0.111 ± 0.13 | 0.054 ± 0.02 | |
| SD2 (s) | 2.528 ± 0.35 | 2.524 ± 0.36 | 2.782 ± 0.74 | 3.057 ± 1.56 | 2.536 ± 0.35 | |
| SD1/SD2 | 0.013 ± 0.01 | 0.021 ± 0.01 | 0.032 ± 0.02 | 0.031 ± 0.02 | 0.021 ± 0.01 | |
| CE | SDNN (s) | 0.066 ± 0.03 | 0.075 ± 0.03 | 0.135 ± 0.07 | 0.134 ± 0.08 | 0.073 ± 0.03 |
| RMSSD (s) | 0.066 ± 0.04 | 0.099 ± 0.04 | 0.193 ± 0.10 | 0.184 ± 0.11 | 0.095 ± 0.04 | |
| pNN50 | 0.396 ± 0.25 | 0.409 ± 0.16 | 0.623 ± 0.17 | 0.520 ± 0.15 | 0.478 ± 0.16 | |
| LF (s2) | 1228.3 ± 1563.1 | 1450.3 ± 1417.9 | 5258.6 ± 7295.6 | 7957.4 ± 15225.5 | 1074.6 ± 799.8 | |
| HF (s2) | 2380.1 ± 3516.1 | 2543.3 ± 2246.4 | 9538.4 ± 7976.8 | 7727.5 ± 8258.2 | 2592.9 ± 2312.8 | |
| TP (s2) | 4139.3 ± 5155.4 | 4528.8 ± 3885.1 | 16342.6 ± 16589.6 | 18075.5 ± 23059.4 | 4129.6 ± 3175.1 | |
| nLF (n.u.) | 0.307 ± 0.17 | 0.315 ± 0.12 | 0.278 ± 0.12 | 0.320 ± 0.15 | 0.268 ± 0.11 | |
| nHF (n.u.) | 0.498 ± 0.21 | 0.553 ± 0.12 | 0.626 ± 0.16 | 0.571 ± 0.17 | 0.596 ± 0.13 | |
| LF/HF | 0.924 ± 0.93 | 0.651 ± 0.44 | 0.530 ± 0.38 | 1.388 ± 3.73 | 0.506 ± 0.33 | |
| SD1 (s) | 0.047 ± 0.03 | 0.070 ± 0.03 | 0.136 ± 0.07 | 0.130 ± 0.08 | 0.067 ± 0.03 | |
| SD2 (s) | 2.613 ± 0.35 | 2.638 ± 0.38 | 3.050 ± 0.82 | 3.449 ± 1.84 | 2.626 ± 0.36 | |
| SD1/SD2 | 0.018 ± 0.01 | 0.026 ± 0.01 | 0.043 ± 0.02 | 0.037 ± 0.01 | 0.026 ± 0.01 | |
| CR | SDNN (s) | 0.057 ± 0.02 | 0.074 ± 0.03 | 0.127 ± 0.06 | 0.110 ± 0.08 | 0.066 ± 0.02 |
| RMSSD (s) | 0.060 ± 0.03 | 0.100 ± 0.05 | 0.180 ± 0.08 | 0.154 ± 0.10 | 0.086 ± 0.03 | |
| pNN50 | 0.326 ± 0.25 | 0.448 ± 0.19 | 0.588 ± 0.14 | 0.513 ± 0.20 | 0.372 ± 0.15 | |
| LF (s2) | 697.0 ± 603.0 | 1003.7 ± 904.1 | 5003.6 ± 6751.8 | 6446.5 ± 13699.1 | 870.7 ± 687.1 | |
| HF (s2) | 1586.7 ± 2052.1 | 2592.7 ± 2455.7 | 8123.6 ± 6813.6 | 5684.9 ± 6215.7 | 1996.8 ± 1422.7 | |
| TP (s2) | 2938.5 ± 2871.7 | 4182.9 ± 3601.2 | 14634.3 ± 14235.6 | 13936.7 ± 22646.1 | 3376.0 ± 2299.0 | |
| nLF (n.u.) | 0.273 ± 0.15 | 0.250 ± 0.09 | 0.291 ± 0.10 | 0.303 ± 0.14 | 0.250 ± 0.09 | |
| nHF (n.u.) | 0.473 ± 0.23 | 0.583 ± 0.16 | 0.584 ± 0.13 | 0.545 ± 0.19 | 0.587 ± 0.15 | |
| LF/HF | 1.098 ± 1.23 | 0.501 ± 0.30 | 0.547 ± 0.31 | 0.752 ± 0.74 | 0.476 ± 0.26 | |
| SD1 (s) | 0.042 ± 0.02 | 0.071 ± 0.03 | 0.127 ± 0.06 | 0.109 ± 0.07 | 0.061 ± 0.02 | |
| SD2 (s) | 2.632 ± 0.36 | 2.632 ± 0.35 | 3.075 ± 0.86 | 3.145 ± 1.25 | 2.643 ± 0.35 | |
| SD1/SD2 | 0.016 ± 0.01 | 0.027 ± 0.01 | 0.040 ± 0.01 | 0.033 ± 0.01 | 0.023 ± 0.01 | |
BM, baseline measurement; CE, cold exposure; CR, cold recovery.