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From the article:
The scientists discovered that after completing the endurance training program, the structure of many enhancers in the skeletal muscle of the young men had been altered. By connecting the enhancers to genetic databases, they discovered that many of the regulated enhancers have already been identified as hotspots of genetic variation between individuals – hotspots that have been associated with human disease.
The scientists speculate that the beneficial effects of exercise on organs distant from muscle, like the brain, may largely be mediated by regulating the secretion of muscle factors. In particular, they found that exercise remodels enhancer activity in skeletal muscle that are linked to cognitive abilities, which opens for the identification of exercise training-induced secreted muscle factors targeting the brain.