Earlier this year, a study published in the journal Pediatrics found that five games that are marketed with the promise of increasing players' physical fitness produced no actual difference in activity. 78 kids between 9 and 12 were given Wii consoles, and then one group was given a couple of exergames while a control group was given "inactive" games like Madden and Mario Kart. The kids wore devices to measure their physical activity, and they kept logs of when they played.
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To be certain, the study was performed by a very accomplished group of researchers. The lead author, Tom Baranowski of Baylor College, is one of the most widely published researchers of health games. And this was a very well-designed study, printed in the foremost journal on children's health. Nevertheless, the study should not be read to mean that games can't affect physical activity and can't have a positive impact on public health. That's because it didn't account for the most influential factor in a health game's impact -- its design.
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