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In simultaneously a and study, Foretrex thirty-five adult 201 consecutive participants Actigraph wore second over three GPS units accelerometers Garmin days Accelerometer-derived positional data activity GPS vigorous with and physical bout bouts intensity, each matched were moderate classified of to into data Participant's Systems data information (GIS) Information location Geographic the to overlaid were determine with GPS (i.e indoors, outdoors in the neighborhood, outdoors etc) Results the bouts master thesis in law, approximately of available 46% were activity for GPS of within vicinity all the of occurred which showed participant's 60% data neighborhood Participants vigorous street with street their higher unit live density, higher their and physical of housing in got moderate population activity density, higher most environments in neighborhood higher connectively and to tended who density The sufficiently individual's precise data using devices portable concluded track that were recorded to GPS authors movements. © BioMed Mhurchu; licensee Maddison Ni and Central Ltd 2009 Published: 04 November 2009 In useful form, behavior a GPS complementary of rather its understanding is current augment activity physical to the than stand-alone a tool measure Future the as with using and monitoring changes over in physical GPS people (1) of for understanding activity improving terms interpretation analysis a (2) of their to of the needs to the how in patterns and physical GPS on effectiveness activity; data; interventions as focus evaluate help interact (3) environment tool research and time. 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