Effects of three aerobic exercise modalities (walking, running, and cycling) on circulating brain-derived neurotrophic factor in older adults: a systematic review and meta-analysis.

In terms of exercise intensity, the high-intensity exercise group showed a borderline positive effect ( p = 0.05), while the low and moderate-intensity groups did not reach statistical significance ( p > 0.05), and the differences between these groups were not significant ( p > 0.05).

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