Table 2. Effects of PMF on HRV parameters. Gender Baseline Fatigue t P d RMSSD (ms) Total 33.26 ± 12.38 18.03 ± 10.33 5.22 0.000 0.50 M 31.42 ± 13.35 16.76 ± 9.44 3.80 0.002 0.49 F 35.72 ± 11.03 19.73 ± 11.61 3.44 0.006 0.52 SDNN (ms) Total 51.46 ± 13.59 38.33 ± 12.58 3.41 0.002 0.33 M 52.40 ± 15.04 34.38 ± 9.92 3.05 0.012 0.48 F 50.72 ± 12.86 41.43 ± 13.89 1.85 0.087 0.21 nLF (nu) Total 55.75 ± 13.01 66.08 ± 7.59 -3.57 0.002 0.35 M 61.79 ± 9.13 66.86 ± 7.24 -1.65 0.124 0.19 F 49.21 ± 13.73 65.08 ± 8.17 -3.48 0.005 0.52 nHF (nu) Total 40.03 ± 9.57 30.36 ± 9.86 3.47 0.002 0.32 M 37.27 ± 9.46 30.65 ± 10.88 2.15 0.050 0.25 F 43.80 ± 9.81 29.97 ± 8.77 2.78 0.020 0.44 nLF/nHF (%) Total 126.39 ± 78.59 211.72 ± 113.29 -4.29 0.000 0.40 M 155.65 ± 85.37 209.07 ± 120.47 -1.94 0.073 0.21 F 95.04 ± 56.78 214.56 ± 109.53 -4.46 0.001 0.61 RMSSD, root mean square of successive differences (RMSSD) in RR intervals; SDNN, standard deviation of normal-to-normal RR intervals; nLF, normal power of the low-frequency band (0.04–0.15 Hz); nHF, normal power of the high-frequency band (0.15-0.4 Hz); M, male; F, female.