Table 3.
Electrocardiogram signal quality—freshwater immersion without movement condition.
| Parameter | Ag/AgCl | PLS | p-Value | Ag/AgCl | PLP | p-Value | |
|---|---|---|---|---|---|---|---|
| Temporal measures of HRV | meanNN (ms) | 840.0 ± 155.6 | 828.0 ± 97.8 | 0.8358 | 778.0 ± 275.1 | 746.9 ± 119.1 | 0.4171 |
| SDNN (ms) | 112.9 ± 64.0 | 53.5 ± 13.8 | 0.0223 | 225.4 ± 135.2 | 72.8 ± 27.6 | 0.0044 | |
| RMSSD (ms) | 144.9 ± 101.7 | 54.5 ± 20.0 | 0.0271 | 304.5 ± 189.0 | 75.9 ± 41.8 | 0.0027 | |
| NN50 | 61.37 ± 39.28 | 43.0 ± 33.6 | 0.3318 | 162.33 ± 108.57 | 102.88 ± 99.19 | 0.2429 | |
| Spectral measures of HRV | LF (ms2) | 3809 ± 3317 | 1105 ± 686 | 0.0404 | 11390 ± 15613 | 1514 ± 1238 | 0.0767 |
| HF (ms2) | 7168 ± 7290 | 886 ± 600 | 0.0292 | 24366 ± 38574 | 1678 ± 2052 | 0.0971 | |
| Total (ms2) | 667061 ± 15484 | 638996 ± 15272 | 0.7205 | 584884 ± 181314 | 492856 ± 147666 | 0.2549 | |
| LF/HF | 1.03 ± 0.74 | 1.42 ± 0.66 | 0.2799 | 0.62 ± 0.29 | 1.47 ± 0.89 | 0.0154 | |
| Corr-Coef | r (unitless) | 0.41 ± 0.23 | 0.96 ± 0.02 | 0.0000 | 0.41 ± 0.23 | 0.93 ± 0.04 | 0.0000 |