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The aim of this study was to analyze the validity and reliability of an instrument to assess bicycle use patterns in urban areas through systematic observation. The instrument items were selected from a literature review. Content validity was established by consensus opinion of experts of the physical activity area. The temporal stability (reliability) was verified by percentage of agreement and intraclass correlation coefficient (ICC). Observations were conducted using an adapted protocol based on the System for Observing Play and Recreation in Communities (SOPARC), consisting of systematic scans for counting cyclists in an urban area through video images provided by the public transport control system of Curitiba (URBS). Observers A and B recorded a total of 383 and 378 cyclists. Most of the observed subjects were men (87%), adults (84%), cycling on the BRT lane (54%), coming from downtown (54%), rode the bicycle on the wrong side of the street (58.2%), were not wearing a helmet (76.8) and bicycled alone (64%). Agreement percentiles ranged from 89.2 to 99.5% and ICC values from 0.922 to 0.999. According to criteria adopted, reliability was considered high in all categories included in the instrument. The instrument showed validity and reliability to be used in studies aiming to evaluate bicycle use patterns in Brazilian urban areas. Resumo O objetivo deste estudo foi analisar a validade e fidedignidade de um instrumento para avaliar o padrão de uso de bicicleta em áreas urbanas de forma observacional. Os itens componentes do instrumento foram selecionados a partir da revisão da literatura sobre o tema. A validade de conteúdo foi estabelecida pelo parecer consensual de especialistas da área de atividade física e saúde. A estabilidade temporal (fidedignidade) foi verificada por meio do percentual de concordância e pelo coeficiente de correlação intraclasse (CCI). As observações foram realizadas com um protocolo adaptado e baseado no System for Observing Play and Recreation in Communities (SOPARC), consistindo de varreduras sistemáticas e periódicas para a contagem de ciclistas em uma via urbana, a partir de filmagens cedidas pelo controle do transporte público de Curitiba (URBS). Ao todos foram realizadas 383 e 378 observações de ciclistas, respectivamente pelos avaliadores A e B. A maior parte dos sujeitos observados eram homens (87%), adultos (84%), pedalaram no BRT (54%), na direção centro/bairro (54%), conduziram a bicicleta na contramão (58,2%), sem capacete (76,8) e sozinhos (64%). Os percentis de concordância variaram entre 89,2 e 99,5% e os valores de CCI entre 0,922 e 0,999. Segundo os critério empregados, a fidedignidade foi classificada como elevada em todas as categorias de observação contidas no instrumento. O instrumento apresenta validade e fidedignidade para o emprego em pesquisas para avaliação do padrão de uso de bicicleta em contextos urbanos brasileiros.

This study aimed to examine the validity and reliability of scales of intrapersonal, interpersonal, and environmental factors associated with physical activity (PA) in secondary students. Two cross-sectional studies were conducted with students in 7th to 9th grades form secondary schools in order to test the validity, internal consistency (n = 1,178, 51.4% were boys), and test–retest reproducibility (n = 194, 56.2% were boys) of the instrument. Factors associated with PA (attitude, self-efficacy, social support of friends, parents and the school’s teachers, as well as the perceived neighborhood environment and perceived school environment) were measured. The confirmatory factor analysis and Spearman correlation between the scales and the weekly time spent in moderateto-vigorous PA (measured by questionnaire) were applied to test the construct validity. For reliability, the Cronbach’s α (internal consistency), composite reliability (CR) and intraclass correlation coefficient (ICC for test–retest reproducibility) were applied. The confirmatory factorial analysis showed five one-dimensional and two two-dimensional (self-efficacy and perceived environment) scales, with factor loadings ranging from 0.46 to 0.85. Significant and positive correlations between almost all scale scores and moderateto-vigorous PA (p