[A functional magnetic resonance imaging study of exercise addiction]

Objective: To investigate the brain activities of exercise addiction (EA) group people with the task-functional magnetic resonance image (task-fMRI). Methods: A total of 29 exercise addicts (addiction group, average age 46±4 years) and 26 non-exercise addicts (control group, average age 46±6 years) matched by sex, age, average education level and sports dependence degree were selected by using exercise addiction index (EAI) through questionnaires to members of Jiangsu Local Fitness and Long-distance Running Association between January 2018 and June 2018. The participants were scanned with fMRI while watching sports pictures or non-sports pictures. The brain responses of the two groups under two stimulation tasks were analyzed and compared. Results: Compared with the control group, while watching sports pictures, the right fusiform gyrus (MNI:x=30, y=-87, z=0), left posterior central gyrus (MNI:x=-51, y=-21, z=54), left medial superior frontal gyrus (MNI:x=-9, y=54, z=30), and right middle occipital gyrus (MNI:x=42, y=-72, z=36) were significantly inhibited in the addiction group (t-test, all P<0.05). When watching non-sports pictures, the addictive group showed the left superior frontal gyrus (MNI:x=-12, y=54, z=30), left middle frontal gyrus (MNI:x=-30, y=18, z=45), right inferior frontal gyrus (MNI:x=42, y=33, z=-12), right occipital gyrus (MNI:x=42, y=-72, z=36), and they were more significantly inhibited than the control group (t-test, all P<0.05). Conclusion: Compared to the control group, the EA group shows significant brain inhibition with visual stimulation, particularly with non-sports pictures.