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Violent Video Games Affect Boys' Biological Systems, Study Finds
Both heart rate and sleep in boys are affected by violent video games. In the study boys (12-15) were asked to play two different video games at home in the evening. The boys' heart rate was registered, among other parameters. It turned out that the heart rate variability was affected to a higher degree when the boys were playing games focusing on violence compared with games without violent features.
Source: ScienceDaily