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Changes of word numbers in the VFT and error numbers in the Stroop test from baseline in the high-fatigue subgroup, classified using POMS2. The solid line shows the whey peptide group (n = 12) and the dotted line shows the placebo group (n = 13). The data represent mean, and error bars indicate SD. The p-values and # show between group differences, performed using unpaired t-tests, # p < 0.05. ** p < 0.01 performed using paired t-tests (vs. baseline).
