Table 3 Changes in frequency-domain measures of heart rate variability during 6-month mission in space
Pre | F01 | F02 | F03 | Post | Space versus Earth: Paired t (P) | F01–F03: F (P) | ||
|---|---|---|---|---|---|---|---|---|
24-h | ||||||||
ULF component (0.0001–0.003 Hz) | Mean s.d. | 4314.8 2903.5 | 3364.1 1983.0 | 2411.0 1750.0 | 3103.6 1950.0 | 4052.1 1965.3 | 3.531 (0.060) | 0.472 (NS) |
ULF band-1 (0.0001–0.0003 Hz) | Mean s.d. | 1669.2 1138.7 | 1822.4 880.8 | 1494.2 1302.6 | 2257.5 1566.4 | 1391.5 694.7 | 1.325 (NS) | 0.625 (NS) |
ULF band-2 (0.0003–0.001 Hz) | Mean s.d. | 1708.6 1578.9 | 892.5 420.1 | 897.6 637.7 | 939.7 606.3 | 1443.0 644.1 | 6.967 (<0.005) | 0.015 (NS) |
ULF band-3 (0.001–0.005 Hz) | Mean s.d. | 1748.3 1582.1 | 961.3 588.5 | 875.8 532.4 | 1087.5 896.3 | 1596.6 1009.0 | 6.200 (<0.01) | 0.166 (NS) |
