Percorrer por autor "Arruda, Miguel de"
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- Body mass index and physical fitness in Brazilian adolescentsPublication . Lopes, Vitor P.; Malina, Robert M.; Gomez-Campos, Rossana; Cossio-Bolaños, Marco; Arruda, Miguel de; Hobold, EdilsonEvaluate the relationship between body mass index and physical fitness in a cross-sectional sample of Brazilian youth.Methods: Participants were 3849 adolescents (2027 girls) aged 10-17 years. Weight and heightwere measured; body mass index was calculated. Physical fitness was evaluated with a multi-stage 20 m shuttle run (cardiovascular endurance), standing long jump (power), and push-ups(upper body strength). Participants were grouped by sex into four age groups: 10-11, 12-13,14 years. Sex-specific ANOVA was used to evaluate differences in each physicalQ2fitness item among weight status categories by age group. Relationships between body massindex and each physical fitness item were evaluated with quadratic regression models by agegroup within each sex.Results: The PF of thin and normal youth was, with few exceptions, significantly better thanthe physical fitness of overweight and obese youth in each age group by sex. On the other hand,physical fitness performances did not consistently differ, on average, between thin and normalweight and between overweight and obese youths. Results of the quadratic regressions indicateda curvilinear (parabolic) relationship between body mass index and each physical fitness itemin most age groups. Better performances were attained by adolescents in the mid-range of thebody mass index distribution, while performances of youth at the low and high ends of the bodymass index distribution were lower.
- Linear and nonlinear relationships between body mass index and physical fitness in Brazilian children and adolescentsPublication . Lopes, Vitor P.; Cossio-Bolaños, Marco; Gómez-Campos, Rossana; Arruda, Miguel de; Hespanhol, Jefferson Eduardo; Rodrigues, Luis PauloThe purpose of this study was to evaluate the linear and curvilinear relationship between body mass index (BMI) and physical fitness in children and adolescents. Participants were 4567 (2505 girls) children aged 6–16 years. Weight and height were measured and BMI was calculated and adjusted for age and sex using WHO z-scores. Physical fitness was evaluated with the following tests: Yo-Yo test, standing long jump, seated 2-kg medicine ball throw, and 20-m dash. Participants were grouped into two groups according to their maturity status, estimated as years from peak height velocity. Associations were determined with linear and nonlinear quadratic regression models. The nonlinear quadratic regression coefficient was significant for the 20-m dash among girls of both maturity status levels, and in maturity status level 1 boys; for the standing long jump among boys of both maturity status levels, and in maturity status level 1 girls. The Yo-Yo test was only significant for maturity status level 1 boys. For the medicine ball throw, the linear regression coefficient was significant for both maturity status levels in both sexes. Almost all physical fitness items were observed to have meaningfully large nonlinear relationships with BMIz, but they were not all significant due to the small sample size, especially in maturity status level 2. Conclusion: The association between BMI and physical fitness is nonlinear in the majority of its components, and those with lower and higher BMI had poorer fitness.
- Reference standards to assess physical fitness of children and adolescents of Brazil: An approach to the students of the Lake Itaipú region-BrazilPublication . Hobold, Edilson; Lopes, Vitor P.; Gómez-Campos, Rossana; Arruda, Miguel de; Andruske, Cynthia Lee; Pacheco-Carrillo, Jaime; Cossio-Bolaños, Marcohe importance of assessing body fat variables and physical fitness tests plays an important role in monitoring the level of activity and physical fitness of the general population. The objective of this study was to develop reference norms to evaluate the physical fitness aptitudes of children and adolescents based on age and sex from the lake region of Itaipú, Brazil. Methods. A descriptive cross-sectional study was carried out with 5,962 students (2,938 males and 3,024 females) with an age range of 6.0 and 17.9 years. Weight (kg), height (cm), and triceps (mm), and sub-scapular skinfolds (mm) were measured. Body Mass Index (BMI kg/m 2 ) was calculated. To evaluate the four physical fitness aptitude dimensions (morphological, muscular strength, flexibility, and cardio-respiratory), the following physical education tests were given to the students: sit-and-reach (cm), pushups (rep), standing long jump (cm), and 20-m shuttle run (m). Results and Discussion. Females showed greater flexibility in the sit-and-reach test and greater body fat than the males. No differences were found in BMI. Percentiles were created for the four components for the physical fitness aptitudes, BMI, and skinfolds by using the LMS method based on age and sex. The proposed reference values may be used for detecting talents and promoting health in children and adolescents.