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Tryptophan concentrations before and after exhaustive exercise in the probiotic (n = 14) and placebo (n = 15) group of trained athletes before and after 12 weeks of treatment (four blood draws per athlete). Graph shows mean ± SEM; * p < 0.05: Wilcoxon, # p < 0.05: week 0, before exercise placebo vs. probiotics: Mann-Whitney-U, n.s. = not statistically significant.
