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Background: The aim of this study was to analyse the validity and accuracy of the low-cost Xiaomi Mi Band 4 (MB4) fitness tracker in relation to step count and heart rate in free-living conditions. Methods: 46 participants join in this study (38.65 ± 14.36 years old). The MB4 was compared with a video recording in laboratory conditions, also with the Sense Wear and Firstbeat monitors in free-living conditions. Results: No significant differences were found in the number of steps in the laboratory protocol between devices, in both, at low and high walking speed. For the free-living conditions, the MB4 showed high values of convergent validity in relation to the Firstbeat monitor during recording in both rest and walking situations. Moreover, the MB4 showed adequate values of convergent validity with the Sense Wear monitor during the 24 h recording, at medium speeds, and climbing stairs. Conclusion: The accuracy and precision of the MB4 is reasonable and can be used to monitor the average of step count and heart rate in free-living conditions.

The aim of this study was to analyze the association between social support and leisure-time physical activity level in students from the federal network of Rio Grande do Sul, and their relationships with sex and the different types and sources of social support. A cross-sectional study was carried out in order to make up a sample of 833 students aged between 13 and 25 years, enrolled from the 1st to the 3rd year in a technical high school from four campuses of the Federal Institute of Education, Science and Technology of Rio Grande do Sul (IFsul). Among the respondents, 50.3% (CI 95% 46.9 -53.7) of the sample was considered physically active during leisure-time, and boys (64.7%; CI 95% 59.9 -69.1) were more active than girls (36.8%; CI 95% 31.7 -40.9). In the adjusted analysis, individuals who had higher social support from parents showed a higher probability of being active in comparison to those with less social support, showing the Prevalence ratio (PR) of 2.55 (CI 95% 1.67-3.90) among girls and 1.64 (CI 95% 1.20-2.23) among boys. About the social support from friends, boys located in the more elavated level of social social support had greater probability of being active related to those with lower social support. (RP 2.19; CI 95% 1.46-3.26). The same analysis among girls has also shown significant results (PR 1.67; CI 95% 1.08-2.58). It was concluded that social support from parents and friends is an important tool in order to promote physical activity in adolescents. KeywordsStudents, Social Support, Motor Activity. 95% 46,9 -53,7) da amostra foi considerada fisicamente ativa no lazer, sendo que os rapazes (64,7%; IC 95% 59,1) foram mais ativos que as moças (36,8%; IC 95% 31,9). Na análise ajustada, indivíduos com maior apoio social dos pais tiveram maior probabilidade de serem ativos comparados àqueles com menor apoio social, apresentando entre as moças a razão de prevalências (RP) de 2,55 (IC 95% 1,90) (RP 2,19; IC 95% 1,26). A mesma análise entre as moças também mostrou resultados significativos (RP 1,67; IC 95% 1,58). Concluiu-se que o apoio social dos pais e amigos constitui-se como uma importante ferramenta na promoção de atividade física em adolescentes. Resumo O objetivo do presente estudo foi analisar a associação entre apoio social e nível de atividade física no lazer em escolares da rede federal de ensino do Rio Grande do Sul, além de suas relações com sexo e os diferentes tipos e fontes do apoio social. Foi conduzido um estudo transversal compondo uma amostra de 833 escolares com idade entre 13 e 25 anos, matriculados do 1º ao 3º anos do ensino médio técnico integrado de quatro campi do Instituto Federal de Educação, Ciência e Tecnologia Sul-rio-grandense (IF-Sul). Entre os respondentes, 50,3% (IC

Summary Background Identifying environmental factors that influence health in children are necessary to develop preventive strategies. Objective To determine the association between the lifestyles of children (i.e., Mediterranean diet (MD), physical activity (PA), fitness and screen time (ST) with abdominal obesity (AO) of preschoolers from three Spanish‐speaking countries (Chile, Colombia and Spain) with different socioeconomic levels and Human Development Index (HDI) indicators. Material and Methods This cross‐sectional study included 982 schoolchildren (aged 4–6 years; 56.8% girls) from Chile (n = 409), Colombia (n = 281), and Spain (n = 292). Body mass index (BMI), waist circumference (WC), waist‐to‐height ratio (WtHR), adherence to the MD, PA, ST and physical fitness were evaluated. Results Spanish preschoolers reported a lower WtHR (p < 0.001), greater physical fitness (Z‐score) (p < 0.001) and higher adherence to the MD (p < 0.001) than their Chilean and Colombian peers. In addition, Colombian preschoolers had a better lifestyle (PA + ST) than their Chilean and Spanish peers (p < 0.001). Chilean preschoolers reported a higher prevalence of AO than the Spanish preschoolers (65% vs. 51.9%; p = 0.001). Conclusion Lifestyle had a significant association with AO among Spanish‐speaking preschool children, with physical fitness especially being a relevant factor regardless of the country of origin. The findings of the current study may support the development of public guidelines focusing on healthy lifestyles in children to create effective plans that contribute to the early treatment of AO in preschool children.