Control Football p value Blood pressures %SBP0-60 (%) -2 (-5 – 3) -2 (-4 – 6) NS %SBP0-90 (%) 3 (-2 – 6) 4 (-1 – 8) NS %DBP0-60 (%) -1 (-6 – 5) 3 (-2 – 11) NS %DBP0-90 (%) 1 (-3 – 11) 6 (1 – 18) NS %PP0-60 (%) 0 (-10 – 11) -4 (-20 – 3) NS %PP0-90 (%) 3 (-8 – 15) -6 (-24 – 4) NS Time domain HRV measures %HR0-60 (%) -12 (-19 – -9) -6 (-11 – -4) 0.009 %HR0-90 (%) -10 (-16 – -5) -7 (-8 – -3) NS %mRRI0-60 (%) 13 (9 – 24) 6 (4 – 13) 0.009 %mRRI0-90 (%) 11 (6 – 19) 8 (3 – 9) NS %SDRR 0-60 (%) 32 (18 – 63) 0.4 (-19.0 – 13.1) <0.001 %SDRR 0-90 (%) 28 (20 – 59) 3 (-20 – 20) 0.001 %CVRR 0-60 (%) 19 (5 – 33) -8 (-19 – 2) <0.001 %CVRR 0-90 (%) 15 (6 – 45) -0.4 (-17.6 – 10.9) 0.005 %rMSSD0-60 (%) 38 (25 – 87) 18 (-12 – 32) 0.002 %rMSSD0-90 (%) 25 (4 – 49) 6 (-12 – 15) 0.033 Frequency domain HRV measures %TP0-60 (%) 70 (39 – 194) 4 (-31 – 31) <0.001 %TP0-90 (%) 40 (16 – 87) 10 (-30 – 40) 0.03 %VLFP0-60 (%) 117 (20 – 225) -17 (-56 – 40) 0.003 %VLFP0-90 (%) 146 (77 – 225) 0.2 (-48.0 – 89.0) 0.01 %LFP0-60 (%) 0.9 (0.2 – 1.8) -0.2 (-0.6 – 0.3) <0.001 %LFP0-90 (%) 0.5 (-0.1 – 1.0) -0.2 (-0.4 – 0.4) 0.046 %HFP0-60 (%) 73 (29 – 226) 36 (-26 – 64) 0.033 %HFP0-90 (%) 29 (-9 – 125) -6 (-23 – 56) NS %nVLFP0-60 (%) 0.09 (-0.31 – 0.51) -0.2 (-0.5 – 0.6) NS %nVLFP0-90 (%) 0.3 (-0.2 – 1.1) -0.2 (-0.4 – 0.8) NS %nLFP0-60 (%) -16 (-30 – 12) 24 (-41 – 6) NS %nLFP0-90 (%) -10 (-17 – 7) -11 (-28 – 36) NS %nHFP0-60 (%) 6 (-10 – 20) 23 (-4 – 35) NS %nHFP0-90 (%) -5 (-22 – 44) -9 (-20 – 16) NS %LHR0-60 (%) -0.1 (-0.5 – 0.1) -0.2 (-0.5 – 0.1) NS %LHR0-90 (%) -0.1 (-0.4 – 0.2) 0 (-0.4 – 0.7) NS

Table 2: Comparison of the percentage change in blood pressures and HRV measures 60 and 90 minutes after baseline measurements between normal controls and football players. Data are presented as medians (25%~75%). NS: Not Significant; HR: Heart Rate; SBP: Systolic Blood Pressure; DBP: Diastolic Blood Pressure; PP: Pulse Pressure; mRRI: Mean RR Interval; SDRR: Standard Deviation of RR Intervals; CVRR: Coeficient of Variation of RR Intervals; rMSSD: Root Mean Squared Successive Difference; TP: Total Power; VLFP: Very Low-Frequency Power; LFP: Low-Frequency Power; HFP: High- Frequency Power; nVLFP: Normalized VLFP; nLFP: Normalized LFP; nHFP: Normalized HFP; LHR: Low-/High-Frequency Power Ratio. Friedman repeated measure ANOVA on ranks with post hoc Student- Newman-Keuls test. *p<0.05 vs. %X0-60, §p<0.05 vs. %X0-90.