A new study shows for the first time that low and high exercise intensities differentially influence brain function. Using resting state functional magnetic resonance imaging (Rs-fMRI), a noninvasive technique that allows for studies on brain connectivity, researchers discovered that low-intensity exercise triggers brain networks involved in cognition control and attention processing, while high-intensity exercise primarily activates networks involved in affective/emotion processing.

Source: High and low exercise intensity found to influence brain function differently: Study suggests that exercise could play a role as a therapeutic strategy in neurological and psychiatric disorders — ScienceDaily

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