Resumo Objetivou-se analisar a reprodutibilidade, validade e consistência interna da escala de ambiente para a atividade física em adolescentes. A análise de reprodutibilidade foi feita com 171 adolescentes (59,5% do sexo feminino), e as de validade e consistência interna compreenderam 1.353 adolescentes (53,1% do sexo feminino). A escala continha 25 itens, em três domínios: locais de prática (LP - 14 itens); segurança urbana (SU - seis itens) e; no trânsito (ST - cinco itens). O Kappa PABAK e a correlação de Spearman (rho) foram utilizados para avaliar a reprodutibilidade; a análise fatorial exploratória (AFE) e confirmatória (AFC) para a validade; e o índice de fidedignidade combinada (IFC) para avaliar a consistência interna. A reprodutibilidade dos escores foi de: LP - rho = 0,76; SU - rho = 0,78 e; ST - rho = 0,66. Foram identificados três fatores na AFE: LP (oito itens, cargas fatoriais de 0,36 a 0,67); SU (quatro itens, cargas fatoriais de 0,60 a 0,78) e; ST (quatro itens, cargas fatoriais de 0,35 a 0,64). A AFC confirmou o modelo com três fatores e com níveis recomendados para os indicadores de qualidade de ajuste do modelo. A consistência interna foi satisfatória para LP (IFC = 0,85), SU (IFC = 0,90) e ST (IFC = 0,79). A escala de ambiente para a prática de atividade física apresentou níveis adequados de reprodutibilidade, validade de construto e consistência interna.
The objective of this study was to examine the association between time engaged in moderate (MPA), vigorous (VPA), and moderate-to-vigorous (MVPA) physical activity (PA) and indicators of lipid profile in adolescents. This longitudinal study with a four-year follow-up, and three collection points (2014, 2015 and 2017) analyzed the data of 136 adolescents (10−13 years old; 53.7% girls), in João Pessoa, Brazil. The time in MPA, VPA and MVPA times was measured by accelerometers. The lipid profile indicators analyzed were total cholesterol (TC), low-density (LDL-C) and high-density lipoproteins cholesterol (HDL-C), triglycerides (TG), non-HDL-C, TC/HDL-C and TG/HDL-c ratios. There was an inverse association between MPA time and TC values (ß = −0.
Context: This study analyzed whether self-efficacy (SE) and perceived environmental characteristics (EC) are determinants of the decline in physical activity (PA) time in adolescents. Methods: This used longitudinal observational approach, with 4 years of data collection, involving 355 adolescents (57.7% girls and 42.3% boys), average age of 11.8 years (0.1 y), from João Pessoa, Paraiba, Brazil. SE and EC were measured by scales and PA by a questionnaire. Ordinal logistic regression was used to associate SE and EC with a decline in PA. Results: There was a linear trend toward a decrease in average PA duration (58.3 [13.7] min/wk/y) and a rise in average access to places for PA (point per year) (0.6 [0.1]), urban safety (0.2 [0.1]), and traffic safety scores (0.5 [0.1]). The results of multivariable analysis indicated that SE and EC were not associated with the decline in PA. Conclusion: There was a decline in PA time, and SE and perceived EC were not determinants of this decline.
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