Table S1. Correlation of confounding factors toward categorical data of variables. Variable Df MF F Sig. Game Position ACC1 2 12.299 .379 .685 RT1 2 4.507 1.495 .230 HRV1 2 .350 .277 .759 CPA1 2 80.090 1.150 .322 SC1 2 26.173 1.367 .260 MF1 2 1.350 .953 .390 RPE1 2 1.011 .623 .539 Sport Level ACC1 2 20.055 .622 .539 RT1 2 7.804 2.656 .076 HRV1 2 2.080 1.699 .189 CPA1 2 31.268 .442 .644 SC1 2 6.467 .330 .720 MF1 2 .338 .235 .791 RPE1 2 2.602 1.641 .200 Moreover, Pearson correlation was recruited to determine whether the continuous data (age, duration of training, motivation, and trait self-control) were correlated or not. One moderate correlation (r = 0.324, p = 0.002) between pre-test motivation (MO1) and pre-test cognitive and somatic anxiety (CSA) was found. Therefore, analyses were applied to two-way repeated ANOVA, except for the variable of CSA, which was applied to two-way repeated ANCOVA (Table S2)