表 2.
研究期间研究对象HRV各指标水平(n=50)
The level of HRV indicators of the research subjects during the research period (n=50)
| Indicator | First visit | Second visit | All |
| Data are expressed as median (interquartile range). SDNN, standard deviation of all normal to normal intervals; SDANN, standard deviation of average normal to normal intervals; rMSSD, square root of the mean squared differences of successive normal to normal intervals; pNN50, percentage of adjacent normal to normal intervals differing by more than 50 ms; TP, total power; VLF, very low frequency power; LF, low frequency power; HF, high frequency power. | |||
| Heart rate/(beats/min) | 62.0 (11.00) | 62.0 (12.0) | 62.0 (11.0) |
| SDNN/ms | 65.0 (42.0) | 64.0 (43.0) | 65.0 (43.0) |
| SDANN/ms | 64.0 (43.0) | 64.0 (43.0) | 64.0 (44.0) |
| rMSSD/ms | 31.0 (16.0) | 31.0 (16.0) | 31.0 (16.0) |
| pNN50/% | 35.0 (36.0) | 34.0 (38.0) | 34.0 (37.0) |
| TP/ms2 | 3 175.1 (4 355.6) | 3 136.5 (4 188.2) | 3 153.4 (4 293.1) |
| VLF/ms2 | 1 211.4 (2 857.7) | 1 196.5 (2 700.2) | 1 205.8 (2 785.7) |
| LF/ms2 | 639.1 (852.1) | 623.1 (915.1) | 633.0 (882.8) |
| HF/ms2 | 697.6 (901.9) | 649.9 (950.9) | 674.6 (928.3) |