Concurrent Training Increases Serum Brain-Derived Neurotrophic Factor in Older Adults Regardless of the Exercise Frequency.

There was a small trend for the interaction effect ( p = 0.063; η 2 = 0.039), non-significant group main effect ( p = 0.827; η 2 = 0.002), and a significant time main effect ( p < 0.001; η 2 = 0.328) on the BDNF concentration.

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Finally, for the skeletal muscle mass, there was a strong trend of the interaction effect, having the 5-t/w the group with more skeletal muscle mass increase compared to the 3-t/w group after 11 weeks of training.

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The results regarding body composition are unclear; some components showed a trend for improvement whereas the variables associated with obesity did not change.

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