54 research outputs found

    Changes in Fitness, physical activity, fatness, and screen time: A longitudinal study in children and adolescents

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    *_Objective:_* To analyze whether changes in Physical Activity Index (PAI), sedentary time (ST; TV and PC use), and Body Mass Index (BMI) made a significant contribution to longitudinal changes in Physical Fitness (PF) of children and adolescents. Additionally, we analyzed interaction between baseline fitness level and changes in fitness. 

*_Methods:_* This is a three years longitudinal study of 345 high school students aged 11-19 years. Students were invited to perform tests from Fitnessgram battery for strength (curl-ups, push-up), and Cardiorespiratory fitness (20m-shuttle run). PAI and ST were evaluated using a standard questionnaire. Standardized scores of physical fitness tests were summed (ZPF). Changes over time, were calculated Δ1 (TP1 minus TP0), Δ2 (TP2 minus TP1), and Δ~total~ (TP2 minus TP0). 

*_Results:_* Changes in PAI were positively and independently associated with changes in ZPF in Δ1, Δ2, and Δ~total~. No significant associations of ΔST and ΔZPF were found. ΔBMI was negative associated with ΔZPF in Δtotal. Participants with higher fitness levels at baseline were those who showed positive changes in PAI over Δ~total~, decreased screen time and had the lowest increase in BMI over three years compared with those who were low-fit at baseline. Conclusions: Changes in PAI were the best predictor for changes in Fitness in children and adolescents in each year and over the three years of evaluation. BMI changes were associated with longitudinal changes in PF

    Do boys and girls achieve di!erent results?" Changes in physical activity and adiposity: acorda project

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    School-based interventions show inconsistent results in reducing obesity-related problems. Most of intervention studies are targeting girls because they have shown lower rates of physical activity and higher prevalence of obesity. ! The aim of this study was to compare the changes observed in BMI, percentage of Body Fat, percentage of Trunk Fat and Moderate to Vigorous physical activity (MVPA) levels between boys and girls engaged in a school-based intervention program.Significant improvements in body composition and MVPA levels were observed in boys, but not in girls, after 8 months intervention. In accordance with previous findings, these results showed that gender may influence response to intervention programs and generalization of treatment effects may depend on gender-specificities and programs characteristics.
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