Background: Several methods exist to asses and control physical intensity levels of subjects engaged in physical activities programs, accelerometry is a method that could be easily used in the field. The purposes were: to calibrate Actigraph in middle-aged to old obese/overweight and DM2 adult patients; and to determine the threshold counts for sedentary, light, moderate, and vigorous physical activity (PA). Methods: Sample comprise 26 participants (62.6 ± 6.5 years of age) of both gender. Counts and VO2 were simultaneously assessed during: resting, seating, standing, walking at 2.5 km•h-1 , 5 km•h-1 , and 6 km•h-1. A hierarchical linear model was used to derive a regression equation between MET and counts. Receiver operating characteristics (ROC) analysis was used to define thresholds for PA levels. Results: The regression equation was: MET = 1.388400490262 + 0.001312683420044 (counts•min-1), r = .867. The threshold counts for sedentary-light, light-moderate and moderate-vigorous PA were: 200, 1240, 2400 counts•min-1 respectively. Conclusion: The Actigraph is a valid and useful device for the assessment of the amount of time spent in each PA intensity levels in obese/overweight and DM2 middle-aged to old adult patients.
Although of low magnitude (r = .068), the intervention programs had a positive effect in prevention and decreasing obesity in children. This effect seems to be higher in older children's, involving interventions with physical activity and nutritional education combined, with parent's participation and with 1-year duration. School or after-school interventions had a similar effect.
Objective: The aim of this study was to determine the prevalence of overweight and obesity in children in the northeast region of Portugal, and to examine its association with sedentary behavior. Methods: Data were collected on 1786 children (907 boys, 879 girls) aged 6 to 13 years. Body mass index was calculated from measured height and weight (weight in kg/height in m squared). Overweight and obesity were determined using the International Obesity Task Force cutoff values. Sedentary behavior was assessed based on means of transport to and from school and time spent watching TV and playing video games (TVPC). Results: The prevalences of overweight and obesity were 22.6% and 9.4% respectively. The differences between the sexes for both overweight and obesity were not significant. Most of the children (78.4%) go to school by car. Boys spend more time on TVPC than girls, both on weekdays and on weekends. The logistic regression model indicated a significant effect of 1.5 hours of TVPC by boys during weekdays (OR=0.246; p=0.015). Boys who spent less than 1.5 hours on weekdays on TVPC were 75.4% less likely to be overweight than those who spent more than 1.5 hours. Conclusion:The prevalence of overweight and obesity was 32%. Only 12.2% of the children spend less than 1.5 hours on TVPC. Boys who spend less than 1.5 hours on TVPC are 75.4% less likely to be overweight/obese than those who spend more than 1.5 hours. PALAVRAS-CHAVEÍndice de massa corporal; Fatores de risco; Estilo de vida sedentário Prevalência de sobrepeso/obesidade em crianças e a sua associação com comportamentos sedentários Resumo Objectivo: determinar a prevalência de sobrepeso/obesidade em crianças da região Nordeste de Portugal, e analisar sua associação com o sedentarismo. Métodos: Os dados foram recolhidos em 1786 crianças (n = 907 meninos, meninas n = 879) com idades entre os 6 e 13 anos, o índice de massa corporal foi calculado a partir da estatura e peso [massa corporal (kg) / Altura (m2)] medidos. O sobrepeso/obesidade foram determinados usando os valores de corte da IOTF. O comportamento sedentário foi avaliado tendo em conta: o meio de transporte e tempo gasto a ver televisão/jogar videojogos (TVPC). Resultados: a prevalência de sobrepeso/obesidade foi de 22,6% e 9,4%, respetivamente. As diferenças entre os sexos, tanto para o sobrepeso como para a obesidade, não foram significativas. A maioria das crianças usa o automóvel (78,4%) para ir à escola. Os meninos gastaram mais tempo em TVPC que as meninas, tanto durante a semana como nos fins de semana. O modelo de regressão logística indicou um efeito significativo de 1,5 horas de TVPC para os meninos, durante a semana (OR = 0,246; p = 0,015). Os meninos que gastaram menos de 1,5 horas durante a semana em actividades TVPC foram 75,4% menos propensos a serem obesos do que aqueles que gastaram mais de 1,5 horas. Conclusão: a prevalência de sobrepeso/obesidade atinge 32%. Apenas 12,2% gastam menos de 1,5 horas em TVPC. Os meninos que passam menos de 1,5 horas em TVPC são 75,4% menos p...
RESUMO O presente estudo visou averiguar a semelhança fraterna nos níveis de aptidão física (AptF). A amostra foi constituída por 366 pares de irmãos de ambos os sexos com idades compreendidas entre os 10 e os 18 anos. Foram realizadas quatro provas de AptF da bateria de testes Fitnessgram (curl-up, push-up, trunklift e corrida/marcha da milha). Os procedimentos de análise utilizados foram o coeficiente de correlação de Pearson (r) e correlação canónica (Rc). Nos pares de irmãos do sexo masculino o valor de correlação mais elevado encontra-se na prova de push-up (r=0,46); a corrida/marcha da milha e o curl-up são as provas onde as irmãs apresentam valores de correlação superiores, r=0,49 e r=0,48 respectivamente; para estes pares a associação multivariada entre as quatro provas de AptF foi de 0,68; entre os pares de irmãos de sexo oposto constata-se um valor de 0,27. Conclui-se que no conjunto das quatro provas de AptF as irmãs são mais semelhantes entre si do que os irmãos; e nos pares de irmãos de sexo oposto verificou-se ausência de semelhança fraterna significativa.
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