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Meta-analysis of the effects of exercise on chronic levels of neurotrophic factors. (A): Chronic levels of BDNF (brain-derived neurotrophic factor). (B): Chronic levels of NGF (nerve growth factor). (C): Chronic levels of CNTF (ciliary neurotrophic factor). Units of neurotrophic factors are displayed as ng·mL−1. See Table 1 and 2 for further study details.
