Associations of obesity, movement behaviors, and socioeconomic status with fundamental movement skills in children: Results from the REACT project.

OBJECTIVE: To investigate the relationship of biological characteristics (age, sex, and obesity), movement behaviors (physical activity and sedentary time), and family socioeconomic status with fundamental movement skills (FMS) in primary school children. METHODS: This cross-sectional study sampled 1014 children (537 girls) aged 6 to 10 years from 25 primary schools in Matosinhos, north of Portugal. Five object control skills (dribbling, kicking, catching, throwing, and underarm rolling) were assessed with a categorical scale using the Meu Educativo® platform. Body Mass Index (BMI) was calculated and transformed into z-scores. Moderate-to-vigorous physical activity (MVPA) and sedentary time were monitored with accelerometry (ActiGraph wGT3X-BT) for seven consecutive days. Family socioeconomic status (SES) was obtained from the Portuguese social support system. Ordinal multilevel logistic regression was used to analyze the associations of weight status, MVPA, sedentary time and SES with FMS, adjusted for sex and age. RESULTS: Boys (odds ratio (OR) = 6.54; 95% CI: 5.13-8.36) and older children (OR = 2.04; 95% CI: 1.85-2.26) were more likely to achieve higher FMS scores. Children with obesity (OR = 0.60; 95% CI: 0.45-0.80), those less active (OR = 0.56; 95% CI: 0.42-0.75) and children with more sedentary time (OR = 0.86; 95%CI: 0.77-0.97) were less likely to score high on FMS. Family SES was not significantly associated with FMS scores. CONCLUSION: Primary school children's FMS are significantly related to biological and behavioral factors but not to family SES. These findings highlight the need for suitable strategies to enhance children's FMS proficiency, considering differences in these characteristics. Fostering adequate motor skill proficiency levels will assist in establishing a robust foundation for healthy lifestyles of all children.

Is there an association between proficiency in fundamental movement skills and mderate-to-vigorous physical activity in childhood on weekdays and weekends? The REACT project.

OBJECTIVE: The present study probes into the association between children's fundamental movement skills (FMS) and moderate-to-vigorous physical activity (MVPA) during weekdays and weekends. METHODS: This cross-sectional sample included 1014 children aged 6-10 years from the REACT project. Physical activity was assessed with accelerometry, and five FMS (stationary dribble, kick, catch, overhand throw, and underhand roll) were assessed with the digital platform Meu Educativo®. Three groups were formed based on the frequency of FMS that each child mastered: group 1 (wizard level in four or five FMS); group 2 (wizard level in two or three FMS); and group 3 (wizard level in at most one skill). Multilevel models were used to analyze the data treating children (level-1) nested within schools (level-2). RESULTS: Compared to group 1, groups 2 (-12.9 ± 2.3 min day-1) and 3 (-23.9 ± 2.4 min day-1) were less physically active during weekdays and weekends (group 2: -14.7 ± 2.7 min day-1 and group 3: -22.4 ± 2.9 min day-1), independent of age and sex. There was a decline in MVPA during the weekend. Further, on average, boys were more active than girls, and with increasing age, children were less active. CONCLUSION: On average, children with higher FMS levels are generally more physically active than their peers with lower FMS levels. Even though MVPA tends to decline on weekends, FMS proficiency is a significant factor in maintaining 60 min of MVPA on weekends.

A multivariate multilevel approach to unravel the associations between individual and school factors on children's motor performance in the REACT project.

OBJECTIVE: The aim was to (1) estimate the relationship between physical fitness (PF) and object control fundamental movement skills (FMS), (2) identify child characteristics that relate with PF and FMS, and (3) examine associations between the school environment, PF, and FMS. METHODS: The sample included 1014 Portuguese children aged 6-10 years from the REACT project. PF was assessed via running speed, shuttle run, standing long jump, handgrip, and the PACER test. Object control FMS were assessed with stationary dribble, kick, catch, overhand throw, and underhand roll. Test performances were transformed into z-scores, and their sum was expressed as overall PF and FMS. Child-level variables included body mass index (BMI) z-scores, accelerometer-measured sedentary time and moderate-to-vigorous physical activity, and socioeconomic status (SES). School size, physical education classes, practice areas, and equipment were also assessed. RESULTS: Approximately, 90% of the variance in object control PF and FMS was at the child level, and 10% at the school level. The correlation between PF and object control FMS was .62, which declined to .43 with the inclusion of covariates. Older, more active, and higher SES children had higher object control PF and FMS, and boys outperformed girls. BMI was negatively associated with PF but not with object control FMS. Sedentary time and number of physical education classes were not significant predictors. Most school predictors did not jointly associate with PF and object control FMS. CONCLUSION: PF and object control FMS z-scores were moderately related. Not all child characteristics were associated with both PF and object control FMS, and their effect sizes were different. School characteristics only explained 10% of the total variation in PF and object control FMS.

Individual and school correlates of body mass index and cardiorespiratory fitness in primary school children from the REACT project: A multivariate multilevel analysis.

OBJECTIVE: This paper examines the relationship between body mass index (BMI) and cardiorespiratory fitness (CRF) using a multivariate multilevel approach and investigates the links between individual and school-related correlates with children's BMI and CRF. METHODS: This cross-sectional sample included 1014 children (6-10 years) from 25 Portuguese primary schools. BMI was calculated, and CRF was assessed with the PACER test. Fundamental movement skills (FMS) included five object control tasks. Moderate-to-vigorous physical activity (MVPA), sleep, and sedentary time were assessed with the ActiGraph wGT3X-BT accelerometer. Socioeconomic status (SES) and school variables were also obtained. A multivariate multilevel model was used, and alpha was set at 5%. RESULTS: BMI and CRF systematically increased with age. Most of the joint variance (94.4%) was explained at the child level, and BMI and CRF were correlated at this level (ρ = -.37). More active children demonstrated higher CRF levels and had lower BMI levels; sedentary and sleep time were not significantly associated with BMI or CRF. FMS were positively associated with CRF but were not significantly associated with BMI. Children at higher SES were more fit and had lower BMI than their peers of lower SES. Finally, school-level variables were not significantly related to BMI and CRF. CONCLUSION: BMI and CRF had a low but statistically significant negative correlation in this sample of children. Most of the variation in BMI and CRF was explained by child-level characteristics.

Validity and reliability of Meu Educativo®: A new tool to assess fundamental movement skills in school-aged children.

OBJECTIVES: There is evidence showing that children's proficiency in fundamental movement skills (FMS) is positively related to weight status, physical activity, fitness levels, cognitive development, as well as academic performance. Yet, the feasibility of FMS assessment is challenging, especially with relatively large samples of children. This article presents a new tool named Meu Educativo® to assess children's FMS levels, including its validity and reliability. METHODS: We relied on the validity evidence approach based on test content to develop the FMS assessment checklist and the rating system with a team of experts. In this article, we used five FMS (stationary dribbling, kick, overhand throw, catch the ball, and underhand roll). Further, we conducted a series of reliability studies and used percent agreement and Cohen's kappa (κ) as statistics. RESULTS: Experts agreed highly on the checklist's components in the five FMS. Inter-rater reliability ranged from 0.63 for stationary dribbling to 0.93 for overhand throw, and the intra-rater reliability ranged from 0.46 to 0.94. CONCLUSION: Based on the first results, Meu Educativo® was not only easy to use, but was also a reliable tool for FMS assessments. Notwithstanding the need for future studies, Meu Educativo® is a new tool that can be used by teachers, coaches, and motor development specialists dealing with school-aged children and researchers working with large samples.

Statistical analysis of the longitudinal fundamental movement skills data in the REACT project using the multilevel ordinal logistic model.

OBJECTIVES: The REACT project was designed around two main aims: (1) to assess children's growth and motor development after the COVID-19 pandemic and (2) to follow their fundamental movement skills' developmental trajectories over 18 months using a novel technological device (Meu Educativo®) in their physical education classes. In this article, our goal is to describe statistical analysis of the longitudinal ordinal motor development data that was obtained from these children using the multilevel ordinal logistic model. METHODS: Longitudinal ordinal data are often collected in studies on motor development. For example, children or adolescents might be rated as having poor, good, or excellent performance levels in fundamental movement skills, and such ratings may be obtained yearly over time to assess changes in fundamental movement skills levels of performance. However, such longitudinal ordinal data are often analyzed using either methods for continuous outcomes, or by dichotomizing the ordinal outcome and using methods for binary data. These approaches are not optimal, and so we describe in detail the use of the multilevel ordinal logistic model for analysis of such data from the REACT project. Our intent is to provide an accessible description and application of this model for analysis of ordinal motor development data. DISCUSSION: Our analyses show both the between-subjects and within-subjects effects of age on motor development outcomes across three timepoints. The between-subjects effect of age indicate that children that are older have higher motor development ratings, relative to thoese that are younger, whereas the within-subject effect of age indicates higher motor development ratings as a child ages. It is the latter effect that is particularly of interest in longitudinal studies of motor development, and an important advantage of using the multilevel ordinal logistic model relative to more traditional methods.

Sleep and fundamental movement skills in primary schoolchildren: The REACT project.

OBJECTIVE: Whether sleep is related to fundamental movement skills (FMS) in the pediatric population is largely unknown. The objective of this study was to examine the association between sleep characteristics (duration, efficiency, regularity) and FMS proficiency levels in school-aged children. METHODS: This cross-sectional study included 996 children (mean age: 8.3 ± 1.2 years) from 25 of the 32 primary schools in Matosinhos, northern Portugal. Data collection occurred between January and June 2022. Sleep was assessed using an ActiGraph wGT3X-BT accelerometer worn on the wrist for 7 consecutive days. FMS proficiency levels were assessed in the schools with a new digital platform (Meu Educativo®) that evaluated five object control skills (dribble, kick, catch, throw, and underhand roll), with a total score ranging between 5 and 15. Multilevel ordinal logistic regression was used to test the associations between sleep characteristics and FMS proficiency levels. Covariates included age, sex, body mass index z-score, socioeconomic status, and moderate-to-vigorous physical activity. RESULTS: The results showed that sleep characteristics (duration, efficiency, and regularity) were not related to FMS proficiency. Being a boy, older age, and higher moderate-to-vigorous physical activity levels were all significantly associated with better FMS proficiency levels. There were no significant sex-by-age interactions. CONCLUSION: Sleep was not found to be related to FMS performance in children. This finding suggests that sleep is not a good correlate of FMS proficiency levels in school-aged children, and attention should be dedicated to other more important factors such as skill-learning-specific physical activity.

Background, rationale, and methodological overview of the REACT project-return-to-action on growth, motor development, and health after the COVID-19 pandemic in primary school children.

OBJECTIVES: The REACT project was designed around two main aims: (1) to assess children's growth and motor development after the COVID-19 pandemic and (2) to follow their fundamental movement skills' developmental trajectories over 18 months using a novel technological device (Meu Educativo®) in their physical education classes. In this introductory article, the first of the Journal's special issue dedicated to REACT, our goal was to present the project rationale, its methodology, training and certification of the team, statistical approach, quality control, governance, and study management. METHODS: We sampled 1000 children (6-10 years of age) from 25 of the 32 primary schools in Matosinhos, northern Portugal. The protocol included a set of variables clustered around the child (growth, physical fitness, fundamental movement skills, and health behaviors), family (demographics, socioeconomic status, parental support for sports participation and physical activity), school (policies and practices for health behaviors, infrastructure for physical education and sports practices), and neighborhood and home environments (safety, sidewalks, sports facilities, as well as children electronic devices and play equipment at home). A set of standard protocols were implemented in REACT together with a rigorous system of training and certification of all members of the research team. This was complemented with a pilot study to assess, in loco, the quality of data acquisition, data entry, and control. DISCUSSION: Results from REACT will provide school administrators and teachers with novel and far-reaching information related to children's growth and motor development as well as health behaviors after the COVID-19 pandemic. It will also provide city-hall education officials with insight regarding children's physical fitness, fundamental movement skills, and sports practices that will be of great importance in devising novel intervention programs to increase health-enhancing physical activity, and combat sedentariness and obesity. Finally, it will offer parents a wealth of information regarding their children's growth, motor development, and health.

Sibling Resemblance in Physical Activity Levels: The Peruvian Sibling Study on Growth and Health.

Physical activity is associated with a host of positive health outcomes and is shaped by both genetic and environmental factors. We aim to: (1) estimate sibling resemblance in two physical activity phenotypes [total number of steps∙day-1 and minutes for moderate steps per day (min∙day-1)]; and (2) investigate the joint associations of individual characteristics and shared natural environment with intra-pair sibling similarities in each phenotype. We sampled 247 biological siblings from 110 nuclear families, aged 6-17 years, from three Peruvian regions. Physical activity was measured using pedometers and body mass index was calculated. In general, non-significant variations in the intraclass correlation coefficients were found after adjustment for individual characteristics and geographical area for both phenotypes. Further, no significant differences were found between the three sib-ship types. Sister-sister pairs tended to take fewer steps than brother-brother (ß = -2908.75 ± 954.31). Older siblings tended to walk fewer steps (ß = -81.26 ± 19.83), whereas body mass index was not associated with physical activity. Siblings living at high-altitude and in the Amazon region had higher steps/day (ß = 2508.92 ± 737.94; ß = 2213.11 ± 776.63, respectively) compared with their peers living at sea-level. In general, we found no influence of sib-types, body mass index, and/or environment on the two physical activity phenotypes.

Sibling Resemblances in Physical Fitness in Three Distinct Regions in Peru: The Peruvian Sibling Study on Growth and Health.

We estimated sibling resemblance in health-related physical fitness (PF) and examined how individual characteristics and shared natural environment accounted for sibling similarities. The sample comprised 656 sibling pairs and 102 triplets (6-15 years of age), from three geographical areas of Peru. PF components included morphological (waist circumference, sum of skinfolds), muscular (handgrip strength, standing long jump), and motor (shuttle-run). Body mass index (BMI) and somatic maturation were also assessed. In general, sibling intraclass correlations differed significantly across sib-ship types for waist circumference and handgrip strength but were the same for sum of skinfolds, standing long jump, and shuttle-run. Further, in general, both individual characteristics and geographical area of residence significantly influenced the magnitude of sibling resemblance as well as the mean levels of PF. In conclusion, individual characteristics and shared natural environment jointly influenced the expression of PF in Peruvian siblings, revealing the importance of these features when designing individualized programs promoting fitness.

[Pain and cervical disability among public workers who use data visualization display terminals]. / Dolor y discapacidad cervical de los trabajadores públicos usuarios de pantallas de visualización de datos.

Work-related neck/shoulder disorders are considered an important health issue. This study is aimed at establishing the pain and cervical disability patterns of workers with visual display terminals, as well as at determining the factors that mostly affect the onset of a new episode of back pain. A descriptive, correlational study was carried out on a sample of 88 workers who use visual display terminals, of the Ministry of Health (Xunta de Galicia). The workers completed the following questionnaires: "Neck Disability Index Scale," "Visual Analog Scale," "12-item Short Form Health Survey," and an individual postural analysis was conducted. For the comparative analysis, the Student's t-test, and the Mann-Whitney U test were performed. A binary logistic regression analysis was used to extract a predictive model of a cervical pain episode, and 58% reported cervical pain. There were no differences between men and women. The variables that best predict the onset of a new episode of pain are the level of disability, and the quality of physical life. Study results indicate that a worker who uses visual display terminals, with high levels of cervical disability and low values of physical quality of life, is more likely to suffer an episode of back pain.

Los trastornos del cuello-hombro relacionados con el trabajo son un importante problema de salud. El objetivo de este estudio es establecer el patrón de dolor y discapacidad cervical de trabajadores con pantallas de visualización de datos, así como determinar los factores que predominan en la aparición de un nuevo episodio de dolor de espalda. Se realizó un estudio descriptivo-correlacional, en una muestra de 88 trabajadores usuarios de ordenadores de la Consellería de Sanidade (Xunta de Galicia). Los trabajadores respondieron los cuestionarios: "Neck Disability Index", "Escala analógica visual", "12-item Short Form Health Survey" y se realizó un análisis postural. Para el análisis comparativo se realizaron las pruebas T Student y U de Mann-Whitney. Un análisis de regresión logística binaria se utilizó para la extracción de un modelo predictivo de episodio de dolor cervical. El 58% refirieron dolor cervical. No existieron diferencias significativas entre hombres y mujeres. Las variables que mejor predicen la aparición de un nuevo episodio de dolor son el nivel de discapacidad y la calidad de vida física. Los resultados indican que un trabajador con altos niveles de discapacidad cervical y bajos valores de calidad de vida física, tiene mayor probabilidad de sufrir un episodio de dolor.

Dolor y discapacidad cervical de los trabajadores públicos usuarios de pantallas de visualización de datos / Pain and cervical disability among public workers who use data visualization display terminals

Resumen Los trastornos del cuello-hombro relacionados con el trabajo son un importante problema de salud. El objetivo de este estudio es establecer el patrón de dolor y discapacidad cervical de trabajadores con pantallas de visualización de datos, así como determinar los factores que predominan en la aparición de un nuevo episodio de dolor de espalda. Se realizó un estudio descriptivo-correlacional, en una muestra de 88 trabajadores usuarios de ordenadores de la Consellería de Sanidade (Xunta de Galicia). Los trabajadores respondieron los cuestionarios: "Neck Disability Index", "Escala analógica visual", "12-item Short Form Health Survey" y se realizó un análisis postural. Para el análisis comparativo se realizaron las pruebas T Student y U de Mann-Whitney. Un análisis de regresión logística binaria se utilizó para la extracción de un modelo predictivo de episodio de dolor cervical. El 58% refirieron dolor cervical. No existieron diferencias significativas entre hombres y mujeres. Las variables que mejor predicen la aparición de un nuevo episodio de dolor son el nivel de discapacidad y la calidad de vida física. Los resultados indican que un trabajador con altos niveles de discapacidad cervical y bajos valores de calidad de vida física, tiene mayor probabilidad de sufrir un episodio de dolor.

Abstract Work-related neck/shoulder disorders are considered an important health issue. This study is aimed at establishing the pain and cervical disability patterns of workers with visual display terminals, as well as at determining the factors that mostly affect the onset of a new episode of back pain. A descriptive, correlational study was carried out on a sample of 88 workers who use visual display terminals, of the Ministry of Health (Xunta de Galicia). The workers completed the following questionnaires: "Neck Disability Index Scale," "Visual Analog Scale," "12-item Short Form Health Survey," and an individual postural analysis was conducted. For the comparative analysis, the Student's t-test, and the Mann-Whitney U test were performed. A binary logistic regression analysis was used to extract a predictive model of a cervical pain episode, and 58% reported cervical pain. There were no differences between men and women. The variables that best predict the onset of a new episode of pain are the level of disability, and the quality of physical life. Study results indicate that a worker who uses visual display terminals, with high levels of cervical disability and low values of physical quality of life, is more likely to suffer an episode of back pain.

Biological and environmental influences on motor coordination in Peruvian children and adolescents.

This study investigated the associations between biological and environmental factors and gross-motor coordination (GMC) in Peruvian children and adolescents. The sample comprised 7401 boys and girls, aged 6-14 years, recruited from three geographical regions: sea-level, Amazon and high-altitude. Biological variables included age, sex, height, BMI, physical fitness, stunting, and maturational status. Environmental influences included geographical region and school characteristics. Gross-motor coordination was tested with the Körperkoordinationstest für Kinder and the data analyzed by multilevel logistic regression. Results showed a high prevalence of below normal GMC scores. Sex, age, geographical area, biological maturation, BMI (normal versus overweight/obesity), and stunting were all significant predictors of GMC. There was also an interaction between age, sex, and geographical area indicating that older girls who lived at sea-level and high-altitude were more likely to display below normal GMC scores. The school context was less important in predicting GMC problems than the interplay between biological characteristics and geographical region. These results suggest that early identification, as well as educational and pediatric care interventions, are of importance in reducing below normal GMC among Peruvian children and adolescents.

A multilevel analysis of gross motor coordination of children and adolescents living at different altitudes: the Peruvian Health and Optimist Growth Study.

BACKGROUND: Gross motor coordination (GMC) is a potential correlate of lifestyle behaviours and health outcomes in childhood and adolescence. AIMS: The aim of this study was to examine how sex, age, biological maturation, overweight, stunting, and physical fitness are associated with GMC in children and adolescents from Peru, and to examine associations between geographical area of residence, school-level characteristics, and GMC. SUBJECTS AND METHODS: The sample included 7408 subjects, aged 6-14 years, from sea level, Amazon and high-altitude regions of Peru. A composite marker of total coordination was derived by the sum of scores from each test (GMCT). Overweight was identified using BMI, and biological maturation, physical fitness, and stunting were assessed. School characteristics were obtained via an objective audit. RESULTS: Boys (ß = 12.23 ± 0.90) and older children (ß = 13.37 ± 0.64) had higher GMCT than girls and younger children, respectively. Overweight was associated with lower GMCT (ß = -5.23 ± 0.80), whereas fitness was positively associated with GMCT (ß = 6.30 ± 0.25). Biological maturation was not a predictor; however, stunting was negatively associated with GMCT (ß = -3.71 ± 1.56). Subjects living in the Amazon had higher GMCT than those at sea level (ß = 16.57 ± 4.73). Five of nine school-level predictors (number of students, playground area with obstacles, multi-sports roofed, frequency and duration of Physical Education classes) were significant predictors of GMCT. CONCLUSIONS: Child- and school-level variables were significantly associated with GMCT in this sample. These findings are important for the Peruvian community, especially school principals, councils and physical education teachers, helping them to define more efficient strategies and action plans to increase motor coordination in children.

A multivariate multilevel analysis of youth motor competence. The Peruvian Health and Optimist Growth Study.

We use a multivariate multilevel model to study the links between physical fitness (PF) and gross motor coordination (GMC) and investigate the influence of predictors affecting their levels across age. We sampled 7918 Peruvians, aged 6-15 years, from sea-level, Amazon region and high-altitude. Composite markers of GMC and PF were derived (GMCz and PFz , respectively). BMI, biological maturation, and stunting were assessed. School characteristics were obtained via an objective audit. School contexts explained 35% of the associations between PFz and GMCz , whereas children's characteristics explained 65% of the total variation. On average, with increasing age, there was a greater increase in GMCz (ß = 0.79 ± 0.04, P < .001) than in PFz (ß = 0.15 ± 0.03, P < .001); boys outperformed girls (PFz , ß = 3.25 ± 0.08, P < .001; GMCz , ß = 1.58 ± 0.09, P < .001); those with lower BMI and ahead in their maturation had higher PFz (ß = -0.13 ± 0.01, P < .001; ß = 1.09 ± 0.05, P < .001, respectively) and GMCz (ß = -0.18 ± 0.01, P < .001; ß = 0.39 ± 0.06, P < .001, respectively) levels. Stunting was negatively related to PFz (ß = -0.30 ± 0.07; P < .001) and GMCz (ß = -0.30 ± 0.08, P < .001) and high-altitude Peruvians had significantly lower GMCz (ß = -0.93 ± 0.33, P < .001), and those living in the Amazon region had significantly higher PFz (ß = 1.21 ± 0.58, P < .001) compared to those living at sea level. A higher number of students was negatively related to PFz (ß = -0.016 ± 0.006, P < .001) and positively with GMCz (ß = 0.005 ± 0.003, P < .001); the duration of physical education classes was positively associated with PFz (ß = 0.70 ± 0.32, P < .001) and GMCz (ß = 0.46 ± 0.15, P < .001); and the existence of policies for physical activity was only negatively associated with GMCz (ß = -1.17 ± 0.34, P < .001). In conclusion, PFz and GMCz were positively correlated and child- and school-level traits predicted their levels.

Stunting and Physical Fitness. The Peruvian Health and Optimist Growth Study.

Stunting, defined as linear growth retardation, is a serious public health problem in developing countries. We aimed to (1) describe the prevalence of stunting in Peruvian youth living in three geographical regions, and to (2) determine height and physical fitness (PF) differences between stunted and normal-growth children across age and sex. We sampled 7918 subjects (7074 normal-growth and 844 stunted), aged 6-15 year, from sea-level, Amazon and high-altitude regions of Peru. PF was assessed with standardized tests, and stunting was computed following World Health Organization (WHO) standards. A two-factor analysis of variance (ANOVA) model was used. Results showed that stunting prevalence increased with age (from 6% at 6 year to 18.4% at 15 year in girls, and 9.3% at 6 year to 16.4% at 15 year in boys); was higher in boys (12.3%) than in girls (9.3%), and was higher in the Amazon region (25.3%), followed by high-altitude (24.3%) and sea-level (8.1%). Stunting had a negative overall impact on girls' and boys' statures. Further, the age-by-stunting interactions were statistically significant for both sexes, and significant differences in height varied to some degree across age. Stunted children performed worse in handgrip and standing long jump, but outperformed their normal-growth peers in shuttle-run (only boys), and in 12 min run. Further, significant differences in the age-by-stunting interaction occurred in all PF tests, varying to some degree across age. In conclusion, stunting significantly affects Peruvian youth's PF levels, and this influence is sex-, age- and PF test-specific.

Correlates of Overweight in Children and Adolescents Living at Different Altitudes: The Peruvian Health and Optimist Growth Study.

Background and Aim: Overweight prevalence in children and adolescents shows great variability which is related to individual-level and environmental-level factors. The present study aimed to determine the prevalence of and factors associated with overweight in Peruvian children and adolescents living at different altitudes. Methods: 8568 subjects, aged 6-16 y, from the sea level, Amazon, and high-altitude regions were sampled. Overweight was identified using BMI; biological maturation and physical fitness were measured; school characteristics were assessed via an objective audit. Results: Overweight prevalence decreased with age (28.3% at 6 y to 13.9% at 16 y); it was higher in girls (21.7%) than boys (19.8%) and was higher at the sea level (41.3%), compared with Amazon (18.8%) and high-altitude (6.3%) regions. Approximately 79% of the variance in overweight was explained by child-level characteristics. In Model 1, all child-level predictors were significant (p < 0.001); in Model 2, six out of nine added school-level predictors (number of students, existence of policies and practices for physical activity, multisports-roofed, duration of Physical Education classes, and extracurricular activities) were significant (p < 0.001); in Model 3, subjects living at high altitudes were less likely to be overweight than those living at the sea level. Conclusions: Child- and school-level variables played important roles in explaining overweight variation. This information should be taken into account when designing more efficient strategies to combat the overweight and obesity epidemic.

Growth velocity curves and pubertal spurt parameters of Peruvian children and adolescents living at different altitudes. The Peruvian health and optimist growth study.

OBJETIVE: To estimate the growth parameters of Peruvian children and adolescents living at different altitudes. METHODS: The sample comprised 10 795 Peruvian children and adolescents (5781 girls, aged 6-7 years) from sea level, the Amazon region, and high altitude. Height was measured with standardized techniques. Mathematical and biological growth parameters were estimated using the Preece-Baines growth model I. RESULTS: Sea-level children and adolescents experienced peak height velocity (PHV) at an earlier age (girls, 8.56 ± 2.37 years; boys, 12.03 ± 0.58 years) were taller at the time of PHV (girls, 144.1 ± 1.9 cm; boys, 154.3 ± 1.4 cm), had higher PHV (girls, 6.23 ± 3.87 cm/year; boys, 7.52 ± 2.31 cm/year), and had a taller estimated final height (girls, 154.2 ± 0.3 cm; boys, 166.3 ± 1.0 cm) compared to those living at high altitude (girls, 152.7 ± 0.7 cm; boys, 162.8 ± 0.8 cm) or in the Amazon region (152.1 ± 0.4 cm; boys, 162.2 ± 0.6 cm). Across all geographical areas, PHV occurred approximately 2 years earlier in girls (9.68 ± 0.99 years) than in boys (12.61 ± 0.42 years), their estimated PHV was 5.88 ± 1.92 cm/year vs 6.45 ± 1.09 cm/year, their size at PHV was 142.2 ± 1.4 cm vs 152.8 ± 0.7 cm, and their final adult height was estimated to be 153.1 ± 0.3 cm vs 164.2 ± 0.7 cm. CONCLUSIONS: Peruvian children and adolescents' physical growth timing and tempo were influenced by their living altitudes. Those living at sea level experienced an earlier age at PHV were taller at time of PHV, had a higher PHV, and had a taller estimated final height compared to those living at higher altitudes. Girls and boys also differed significantly in their growth parameters.

Morphological characteristics and biological maturation of Brazilian and Portuguese gymnasts / Características morfológicas y maduración biológica de gimnastas brasileñas y portuguesas

The morphological characteristics and biological maturation are among the more important factors in the performance in the Rhythmic Gymnastics. Thus, the aims of the present study were: (1) identify the training, morphological and biological maturation characteristics in elite Brazilian and Portuguese gymnasts; (2) compare these characteristics across groups. The Brazilian Portuguese National Team (13 gymnasts) were studied. Anthropometric and body composition measurements were performed. For analysis of biological maturation, the sexual (pubertal stages and age at menarche) and somatic (offset maturational) maturation were evaluated. The training data were collected by interviewing. For the statistical analysis, Mann-Whitney test was applied. The somatotype and calculation of its components were performed according to the Health-Carter method thought of the MER Goulding Software Development. Brazil and Portugal National Teams presented similar training volume and training onset, however Brazilian gymnasts had higher age and years of practice in Rhythmic Gymnastics than Portuguese gymnasts. Brazilian had higher body mass; height; lower limb length; triceps, subscapular and abdominal skinfolds; relaxed arm and thigh girths; and endomorphy somatotype component than Portuguese. The groups showed different somatotypes: Brazilian (endomorphic ectomorph) and Portuguese (balanced ectomorph), although without statistical significance. The groups demonstrated a delay in maturational development. Similar breast (stages 3 and 4) and pubic hair (stages 2 and 3) development were verified. In total, 84.6 % of gymnasts had reached menarche (15.9±2.6 years) and all gymnasts had reached the age at peak height velocity (14.9±1.2 years). The distance and age at peak height velocity were higher in Brazilian than in Portuguese.

Las características morfológicas y la maduración biológica se encuentran entre los factores más importantes en el rendimiento en la gimnasia rítmica. Por lo tanto, los objetivos del presente estudio fueron: (1) identificar las características de entrenamiento, morfológicas y maduración biológica en las gimnastas brasileñas y portuguesas de élite; (2) comparas estas características entre grupos. Se estudió la Selección Nacional Portuguesa y Brasileña (13 gimnastas). Se realizaron mediciones antropométricas y de composición corporal. Para el análisis de la maduración biológica, se evaluaron las etapas sexuales (etapas de pubertad y edad en la menarquia) y somáticas (edad en el pick de velocidad de altura). Los datos de entrenamiento fueron recolectados mediante entrevistas. Para el análisis estadístico, se aplicó la prueba de Mann-Whitney. El somatotipo y el cálculo de sus componentes se realizaron de acuerdo con el método de Health-Carter, pensado en el desarrollo de software MER Goulding. Los equipos nacionales de Brasil y Portugal presentaron un volumen de entrenamiento y un inicio de entrenamiento similares; sin embargo, las gimnastas brasileñas tenían mayor edad y años de práctica en gimnasia rítmica que las gimnastas portuguesas. Las brasileñas tenían mayor masa corporal; altura; longitud del miembro inferior; pliegues cutáneos del músculo tríceps, músculo subescapular y a nivel abdominal; circunferencia relajada del brazo y del muslo; y el componente somatotípico endomórfico que el portugués. Los grupos eran diferentes somatotipos: brasileñas (ectomórfico endomórfico) y portugués (ectomórfico equilibrada), aunque sin significación estadística. Los grupos demostraron un retraso en el desarrollo madurativo. Se verificó un desarrollo similar del seno (estadios 3 y 4) y del vello púbico (estadios 2 y 3). En total, el 84,6 % de las gimnastas alcanzaron la menarquia (15,9 ± 2,6 años) y el 92,3 % de las gimnastas alcanzaron su altura máxima con 17,4 ± 1,2 años. La distancia y la edad en la velocidad de alcance de la altura máxima fueron más altas en Brasil que en Portugal.

A multi-level analysis of individual- and school-level correlates of physical fitness in children.

BACKGROUND: Children's physical fitness is potentially influenced by biological, behavioural and environmental factors. AIM: To investigate the importance of individual-level and school-level characteristics in explaining variation in children's physical fitness. SUBJECTS AND METHODS: The sample comprised 354 Portuguese children, aged 5-10 years. Physical fitness [(handgrip (HG) strength, standing long jump (SLJ), shuttle-run (SR), total physical fitness score (PFz)], gross motor coordination (GMC) and body mass index (BMI) were assessed. Moderate-to-vigorous physical activity (MVPA) was objectively monitored; birth weight and socio-economic status (SES) were obtained by questionnaire. School contexts were assessed via an objective audit. Multilevel models using the Bayesian approach were used. RESULTS: Age was positively associated with HG, SLJ and PFz (p < 0.05); BMI was positively associated with HG (p < 0.05) and GMC with all physical fitness components (p < 0.05); MVPA was only associated with PFz (p < 0.05); children with level A SES outperformed those with level C SES in HG (p < 0.05), but those with level B SES outperformed their level A SES peers in SR (p < 0.05). Within the school context, no equipment for physical education was negatively associated with HG (p < 0.05). CONCLUSION: In the primary school years, individual-level characteristics were more important than the school context in explaining variations in physical fitness.