How physical exercise protects the brain from stress-induced depression

“Our initial research hypothesis was that trained muscle would produce a substance with beneficial effects on the brain. We actually found the opposite: well-trained muscle produces an enzyme that purges the body of harmful substances. So in this context the muscle’s function is reminiscent of that of the kidney or the liver,” says Jorge Ruas, principal investigator at the Department of Physiology and Pharmacology, Karolinska Institutet.

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