title: Ask the doctor.  It seems like more and more people are wearing various devices that measure how active they are.  Is this really valuable, or is it just a fad?
authors.forename: Anthony L
authors.initials: AL
authors.lastname: Komaroff
mesh_terms: D056044:Actigraphy / Q000295:instrumentation*; D015438:Health Behavior; D006293:Health Promotion / Q000379:methods*; D006304:Health Status; D006801:Humans; D008991:Monitoring, Physiologic / Q000295:instrumentation*; D010809:Physical Fitness / Q000502:physiology*