Int J Health Geogr - Using GPS-derived speed patterns for recognition of transport modes in adults.

Tópicos

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Resumo

CKGROUND: Identification of active or sedentary modes of transport is of relevance for studies assessing physical activity or addressing exposure assessment. We assessed in a proof-of-principle study if speed as logged by GPSs could be used to identify modes of transport (walking, bicycling, and motorized transport: car, bus or train).METHODS: 12 persons commuting to work walking, bicycling or with motorized transport carried GPSs for two commutes and recorded their mode of transport. We evaluated seven speed metrics: mean, 95th percentile of speed, standard deviation of the mean, rate-of-change, standardized-rate-of-change, acceleration and deceleration. We assessed which speed metric would best identify the transport mode using discriminant analyses. We applied cross validation and calculated agreement (Cohen's Kappa) between actual and derived modes of transport.RESULTS: Mode of transport was reliably classified whenever a person used a mode of transport for longer than one minute. Best results were observed when using the 95th percentile of speed, acceleration and deceleration (kappa 0.73). When we combined all motorized traffic into one category, kappa increased to 0.95.CONCLUSIONS: GPS-measured speed enable the identification of modes of transport. Given the current low costs of GPS devices and the built-in capacity of GPS tracking in most smartphones, the use of such devices in large epidemiological studies may facilitate the assessment of physical activity related to transport modes, or improve exposure assessment using automated travel mode detection.

Resumo Limpo

ckground identif activ sedentari mode transport relev studi assess physic activ address exposur assess assess proofofprincipl studi speed log gpss use identifi mode transport walk bicycl motor transport car bus trainmethod person commut work walk bicycl motor transport carri gpss two commut record mode transport evalu seven speed metric mean th percentil speed standard deviat mean rateofchang standardizedrateofchang acceler deceler assess speed metric best identifi transport mode use discrimin analys appli cross valid calcul agreement cohen kappa actual deriv mode transportresult mode transport reliabl classifi whenev person use mode transport longer one minut best result observ use th percentil speed acceler deceler kappa combin motor traffic one categori kappa increas conclus gpsmeasur speed enabl identif mode transport given current low cost gps devic builtin capac gps track smartphon use devic larg epidemiolog studi may facilit assess physic activ relat transport mode improv exposur assess use autom travel mode detect

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