Like the treadmills and stationary bikes that become rec room coatracks, fitness and other health-related smartphone apps are acquired in large numbers by Americans, but over time, many are left unused by those who download them. According to results of an online national survey analyzed by researchers at NYU Langone Medical Center, 58 percent of 1,604 adult smartphone users had downloaded one of the estimated 40,000 available health-related mobile applications, and 42 percent had downloaded five or more.
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