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Difference in gray matter density between the brisk walking (BWK) group and usual activity physical (UPA) control group before and after the intervention. E: Brain areas with increased gray matter volume in the BWK group compared with the UPA group: left thalamus, right frontal lobe, right corpus callosum, right anterior cingulate gyrus, left thalamus, ventrolateral nucleus, right occipital lobe, precuneus, left inferior parietal lobe, right frontal lobe and precuneus.
