An active break program (ACTIVA-MENTE) at elementary schools in Chile: study protocol for a pilot cluster randomized controlled trial.

Background: Physical inactivity is prevalent in childhood. Schools can be an ideal context to promote the regular practice of physical activity since children spend there a large part of the day. In this sense, an emerging and current trend is active breaks at school. This article presents a study protocol that seeks to assess the feasibility and effectiveness of an intervention with active breaks (ACTIVA-MENTE program) in a school context on physical activity, on-task classroom behavior, and the physical activity enjoyment in schoolchildren. Methods: The protocol includes children aged 10 to 11 years. Two groups will be randomized (intervention and control groups). The intervention group will use the active break program, ACTIVA-MENTE, which consists of the application of a 4-min, 30-s video with moderate to vigorous-intensity physical activity. These breaks will be taken 6 times a day in the classes for 6 weeks. The total physical activity will be measured with accelerometers (Actigraph wGT3X-BT), the on-task behavior through the Direct Behavior Rating Scale and the level of enjoyment through the Physical Activity Enjoyment Scale. Discussion: Previous research reported that active breaks have positive results in physical activity levels. This study will be one of the few to design active breaks through videos without depending on the presence of a physical education teacher and it can also provide new findings on the effectiveness of an active break's structure (e.g., types of exercises and intensity) on the indicated outcomes. Expected results: It is expected that the ACTIVA-MENTE program can be a suitable program for school settings, potentially increasing physical activity levels, and the commitment to the task, as well as be a pleasant moment for the students. Clinical trial registration: Clinicaltrials.gov, identifier NCT05403996.

Influence of Physical Fitness, Anthropometric Profile, and Biological Maturation on Technical Performance and Enjoyment of Untrained Children Who Participate in Continuous and Fractional Small-Sided Games.

The objective is to determine the relationship between physical fitness, anthropometric measures, and biological maturation as they relate to technical performance in small-sided games (SSGs) of continuous and fractioned regimes. Methodology: A crossover-design study in which 12 children participated in two regimens of SSG (continuous and fractional). At the beginning of the study, all children were evaluated using physical fitness tests (horizontal jump test, vertical jump, cardiorespiratory fitness, and agility), anthropometric profile (weight, height, Body Mass Index (BMI), and waist circumference (WC)), and biological maturation (peak years of growth velocity). All sessions were recorded and analyzed with the Performance Assessment in Team Sports instrument, and at the end of each game each child was asked to answer a scale of enjoyment for physical activity. Results: The results of the paired samples t-test showed no significant differences in the measures of technical performance and perceived enjoyment for the continuous and fractional regimens of SSGs (p > 0.05). The correlation results showed that technical performance in the continuous and fractional regimes was related to agility, horizontal jump, and height, while biological maturation was only related to technical performance in the fractional regimen of SSGs. Perceived enjoyment showed a negative relationship with weight, height, BMI, and WC. Conclusion: The fractional and continuous regimens of SSGs implemented in this study induced similar technical demands and enjoyment. Furthermore, the results suggest that physical fitness, anthropometric profile, and biological maturation may influence the technical performance and enjoyment of SSGs.

Changes in the Mechanical Properties of the Horizontal Force-Velocity Profile during a Repeated Sprint Test in Professional Soccer Players.

The objective was to analyze the changes in the horizontal force-velocity profile (HFVP) during the execution of repeated sprinting. Methods: Seventeen first-division Chilean soccer players completed a repeated sprint protocol consisting of eight sprints of 30 m with 25-s pauses between repetitions. The behavior of HFVP variables in each attempt was recorded from video recordings and analysis in the MySprint® application. Results: Differences (p < 0.05) were found between sprints in the following: time (T), starting from sprint 5 (F = 35.6; η2p = 0.69); theoretical maximum speed (V0), starting from sprint 4 (F = 29.3; η2p = 0.51); maximum power (PM), starting from sprint 5 (F = 17; η2p = 0.52); rate of decrease in force index produced at each step (DRF), starting from sprint 1 (F = 3.20; η2p = 0.17); and RF10, starting from sprint 1 (F = 15.5; η2p = 0.49). In comparison, F0 and RFpeak did not present any differences (p > 0.05). Conclusion: The HFVP variables more sensitive to the effects of fatigue induced by an RSA protocol are those associated with the production of force at high speeds, being V0, DRF, and Pmax, while those that contribute to the generation of force at the beginning of the sprint, F0 and RFpeak, do not present essential variations.

Effects of neuromuscular training on psychomotor development and active joint position sense in school children.

As psychomotor development occurs in a specific social context, the environment in which a child is reared is important. The randomized study involved forty-five school children between 8 and 10 years. They were assigned to a control group (n = 23) and a neuromuscular training group (n = 22). A neuromuscular intervention for six weeks, on two nonconsecutive days, and in a circuit with 30-second stations was performed. The psychomotor development was evaluated through a psychomotor battery and the active joint position sense through the positional error. In the control group, the positional error decreased significantly in the shoulder (p < 0.001) and hip (p < 0.001), while the scores of motor function increased significantly which included balance (p < 0.001), spatio-temporal structuring (p = 0.022), global praxia (p = 0.002), and fine praxia (p = 0.003). In the neuromuscular training group, the positional error decreased significantly in the shoulder (p = 0.015), elbow (p = 0.015), wrist (p < 0.001), hip (p < 0.001), knee (p < 0.001), and ankle (p < 0.001), while the motor function scores increased significantly which included tonicity (p < 0.001), balance (p < 0.001), notion of the body (p < 0.001), spatio-temporal structuring (p < 0.001), global praxia (p < 0.001), and fine praxia (p < 0.001). A six-week neuromuscular training improved active joint position sense and psychomotor development in children.

Composición corporal, somatotipo, rendimiento en salto vertical y consumo máximo de oxígeno en futbolistas profesionales y universitarios / Body composition, somatotype, vertical jump performance and maximal oxygen consumption in professional and university soccer players

RESUMEN. Objetivo: El objetivo de este estudio fue describir y comparar la composición corporal, somatotipo, rendimiento en el salto vertical y consumo máximo de oxígeno en futbolistas profesionales y universitarios de Chillán. Metodología:El presente estudio es de tipo transversal, descriptivo y comparativo, con una muestra no probabilística y por conveniencia. Se evaluarona 52 futbolistas varones; 18 corresponden a jugadores profesionales y 34 universitarios. El perfil antropométrico (índice de masa corporal, composición corporal y somatotipo) se obtuvo a través delos protocolos de la Sociedad Internacional para el Avance de la Kinantropometría (ISAK), el consumo máximo de oxígeno (VO2máx) por medio del Yo-Yo test IR1 y capacidad de salto a través del protocolo de Bosco, utilizando una plataforma de contacto Axon Jump.El análisis estadístico se realizó con el programa SPSS v.21;para comparar a ambos grupos se utilizó el estadístico T-Student para muestras independientes (p<0,05). Resultados: Los resultados muestran que los futbolistas profesionales reportanun mayor porcentaje de masa muscular (p<0,001) y un menor porcentaje de masa grasa (p<0,001) en comparación a los universitarios. Los análisis de somatotipo indican que los jugadores profesionales se clasifican como meso-ectomórfico en comparación a los jugadores universitarios, quienes se clasificaron como meso-endomórfico. Finalmente, en cuanto a los resultados en las pruebas físicas los profesionales obtuvieron diferencias significativas en la capacidad de salto (p<0,001) y en el VO2máx (p<0,001).Conclusión: Los futbolistas profesionales tienen características corporales, somatotípicas y físicas que les permiten sobresalir con respecto a los futbolistas universitarios. Estos datos servirán a los entrenadores universitarios para disponer de los parámetros respecto de características y condiciones a trabajar para acercarse al alto rendimiento.

ABSTRACT. Objective: The objective of this study was to describe and compare the body composition, somatotype, vertical jump performance and maximum oxygen consumption in professional and university soccer players from Chillán. Methodology: The present study is cross-sectional, descriptive and comparative, with a non-probabilistic sample and for convenience. 52 male soccer players were evaluated; 18 correspond to professional players and 34 university players. The anthropometric profile (body mass index, body composition and somatotype) was obtained through the International Society for the Advancement of Kinantropometry (ISAK) protocols, the maximum oxygen consumption (VO2 max) by means of the Yo-Yo test IR1 and ability to jump through the Bosco protocol using an Axon Jump contact platform. Statistical analysis was performed with the statistical program SPSS v.21, to compare both groups the T-Student statistic was used for independent samples (p <0.05).Results: The results show that professional soccer players report a higher percentage of muscle mass (p <0.001) and a lower percentage of fatmass (p <0.001) compared to university players. Somatotype analyzes indicate that professional gamers are classified as meso-ectomorphic compared to college players, who are classified as meso-endomorphic. Finally, regarding the results in the physical tests, the professionals obtained significant differences in jumping ability (p <0.001) and in VO2 max (p <0.001).Conclusion: Professional soccer players have bodily, somatotypic and physical characteristics that allow them to stand out comparated to university soccer players. These data will serve university coaches to have the parameters regarding characteristics and conditions to work to approach high performance.

Efectos de la inclusión de ejercicios de salto con y sin sobrecarga externa en el calentamiento sobre parámetros de rendimiento físico en atletas jóvenes de balonmano / Effects of The Inclusion of Jump Exercises with and without External Overload in The Warm-Up on Physical Performance Parameters in Young Handball Athletes / Efeitos da inclusão de exercícios de salto com e sem pesos externo no aquecimento sobre os parâmetros de desempenho físico de jovens atletas de handebol

Resumen El objetivo de este estudio fue comparar los efectos de un calentamiento con aplicación de saltos cargados y sin carga sobre el tiempo en sprint de 20 metros, saltos horizontales y saltos verticales en jugadores juveniles de balonmano. La muestra estaba conformada por 13 jugadores de balonmano (16,2 ± 1,3 años) de San Carlos. Se realizó un estudio experimental con un diseño crossover aleatorizado. Se aplicaron 3 protocolos de calentamiento distintos, que implicaban correr más estiramientos dinámicos (CE); correr, estiramientos dinámicos y saltos (CES), y, finalmente, correr, estiramientos dinámicos y saltos cargados con el 8 % de su peso corporal (CESH). Para las evaluaciones pre- y poscalentamiento, se utilizó un test de salto contramovimiento (CMJ), salto horizontal (SH) y sprint de 20 metros cronometrado. Los resultados muestran diferencias significativas entre pre- y postest para los 3 grupos en el SH (diferencias para CES: 0,09 ± 0,12; CESH: 0,12 ± 0,16 y CE: 0,07 ± 0,16), mientras que solo CES y CESH mejoraron significativamente la altura en CMJ y tiempo en el sprint de 20 metros (diferencia para CMJ: 2,95 ± 0,56 y 3,50 ± 0,73; y sprint de 20 m: 0,29 ± 0,31 y 0,20 ± 0,26, respectivamente). En conclusión, un calentamiento que incluye distintos tipos de saltos es eficaz para mejorar SH, CMJ y velocidad en 20 metros. Es necesario realizar más investigación, para determinar beneficios específicos de saltos con halteras de manos que mejoren el rendimiento físico.

Abstract The aim of this study is to compare the effects of a warm-up with the application of loaded and unloaded jumps on the performance in speed, horizontal jumps and vertical jumps in youth handball players. The sample consists of 13 handball players from the city of San Carlos (16.2 ± 1.3 years). An experimental study with a randomized crossover design carried out. 3 different heating protocols applied, which involved running more dynamic stretching (RS), running, dynamic stretching and jumping (RSJ) and finally running, dynamic stretching and jumps loaded with 8% of your body weight (RSLJ). For the pre- and post-warming assessments, a countermovement jump test (CMJ), horizontal jump (HJ) and were used through a 20-meter timed to sprint test. The results show significant differences between pre- and post-test for the 3 groups in the SH (difference for CES: 0.09 ± 0.12; CESH: 0.12 ± 0.16 and EC: 0.07 ± 0.16), while only CES and CESH significantly improved the height in CMJ and sprint time of 20 meters (difference for CMJ: 2.95 ± 0.56 and 3.50 ± 0.73; and sprint 20 meters: 0.29 ± 0,31 and 0.20 ± 0.26, respectively). In conclusion, a warm-up that includes different types of jumps is effective in improving SH, CMJ and speed in 20 meters. More research needed to determine specific benefits of handheld loading jumps to improve physical performance.

Resumo O objetivo deste estudo foi comparar os efeitos de um aquecimento com a aplicação de saltos acompanhado e não acompanhados de pesos, em velocidade de 20 metros de tempo, saltos horizontais e saltos verticais em jogadores de handebol juvenil. A amostra foi constituída por 13 jogadores de handebol (16,2±1,3 anos). Foi realizado um estudo experimental com um desenho cruzado randomizado. Foram aplicados três protocolos diferentes de aquecimento, envolvendo alongamentos mais dinâmicos (CE), alongamentos e saltos dinâmicos (CES) e, finalmente, alongamentos e saltos dinâmicos (CESH), carregados com 8% do seu peso corporal. Para as avaliações antes e depois do aquecimento, foram utilizados um salto contra movimento (CMJ), salto horizontal (SH) e um sprint temporizado de 20 metros. Os resultados mostram diferenças significativas entre o pré e após a prova para os três grupos na HAS (diferenças para o CES: 0,09±0,12; CESH: 0,12±0,16 e CE: 0,07±0,16), enquanto apenas o CES e o CESH melhoraram significativamente a altura na CMJ e o tempo de velocidade de 20 metros (diferença para CMJ: 2,95±0,56 e 3,50±0,73; e velocidade de 20 metros: 0,29±0,31 e 0,20±0,26 respectivamente). Em conclusão, um aquecimento que inclua diferentes tipos de saltos é eficaz na melhoria do SH, CMJ e velocidade em 20 metros. Mais pesquisas são necessárias para determinar os benefícios específicos de saltar com pesos para melhorar o desempenho físico.

Test de desarrollo motor aplicados en Chile entre el período 2014-2018: una revisión sistemática / Motor development tests applied in Chile between the period 2014-2018: a systematic review

El desarrollo motor es un proceso continuo y multidimensional del ciclo vital del ser humano. Para el profesor de educación física se hace esencial buscar instrumentos que permitan medir el desarrollo motor para una intervención intencionada que permita alcanzar un desarrollo apropiado a la edad de cada estudiante. El objetivo de este estudio es identificar los test de desarrollo motor aplicados en Chile entre 2014-2018. Se realizó una revisión sistemática de artículos científicos que aplicaron test de desarrollo motor, entre los años 2014-2018. La búsqueda de artículos se realizó en las bases de datos "Ebsco", "Dialnet" y "Scielo". Las palabras claves en la búsqueda fueron, desarrollo motor y test desarrollo motor, en los idiomas español, inglés y portugués. Se obtuvo un total de 9 artículos que cumplieron los criterios de inclusión. Los resultados mostraron que se han utilizado 4 test de desarrollo motor en el periodo declarado. En conclusión, el test más utilizado en Chile es el TGMD-2 el cual es ampliamente recomendado y validado en el contexto chileno; y cuyo propósito se basa en la identificación de los niveles de ejecución (bajo o superior) del desarrollo motor grueso en los niños según la edad cronológica

Motor development is a continuous and multidimensional process of the human being life cycle. For the physical education teacher it is essential to look for instruments that allow measuring the motor development for an intentional intervention that allows achieving an appropriate development at the age of each student. The objective of this study is to identify the motor development test applied in Chile between 2014-2018. A systematic review of scientific articles that applied motor development tests was carried out between 2014-2018. The search for articles was carried out in the "Ebsco", "Dialnet" and "Scielo" databases. The keywords in the search were; motor development and motor development test, in the Spanish, English and Portuguese languages. Nine articles were obtained that met the inclusion criteria. The results showed that four motor development tests have been used in the declared period. In conclusion, the most used test in Chile is TGMD-2 which is widely recommended and validated in the Chilean context; and whose purpose is based on the identification of the performance levels (lower or higher) of gross motor development in children according to chronological age

Efecto de una intervención basada en realidad virtual sobre las habi lidades motrices básicas y control postural de niños con Síndrome de Down / Effect of an intervention based on virtual reality on motor development and postural control in children with Down Syndrome

Resumen: Los estudios sobre intervenciones basadas en realidad virtual y su efecto en el desarrollo motor y control postural en niños con Síndrome de Down (SD) son escasos. Objetivo: Determinar el efec to de una intervención basada en realidad virtual, sobre el desarrollo motor y el control postural en niños con SD. Pacientes y Método: Estudio con un enfoque cuantitativo, con un diseño cuasi experimental, que incluyó a 16 niños con SD asignados aleatoriamente a un grupo experimental (GWBB, n = 9) y grupo control (GC, n = 7). Se evaluó control postural mediante el desplazamien to del centro de presión y desarrollo motor con TGMD-2. El programa de intervención se llevó a cabo durante 2 veces por semana por 5 semanas. Los datos fueron sometidos a análisis estadísti cos, el test de Shapiro Wilk para la distribución de la muestra, y T de Student para la comparación de medias de los grupos. Resultados: Se observaron cambios significativos en el Test TGMD-2 y en su subtest de manipulación (p < 0,01) respectivamente. En el resto de las pruebas hubo una mejora, pero no se observan diferencias significativas. Conclusión: Una intervención basada en realidad virtual fue efectiva solo en el GWBB, proporcionando ejercicios de bajo impacto para mejorar el control postural y provocando con ello una mejora de las habilidades motoras en niños con SD.

Abstract: There are few studies on the effect of a virtual reality-based intervention on motor development and postural control in children with Down Syndrome (DS). Objective: To determine the effect of a virtual reality-based intervention on motor development and postural control in children with DS. Patients and Method: Study with a quantitative approach, with a quasi-experimental design, which included 16 children with DS randomly assigned to an experimental group (GWBB, n = 9) and con trol group (GC, n = 7). Postural control was evaluated by the center of pressure displacement and motor development with TGMD-2. The intervention program was carried out for five weeks, two times per week. The data were subjected to statistical analysis, the Shapiro Wilk test for the sample distribution, and the Student's T-test for the comparison of group means. Results: Significant chan ges were observed in the TGMD-2 Test and its manipulation subtest (p <0.01) respectively. In the rest of the tests, there was an improvement, but no significant differences were observed. Conclusion: A virtual reality-based intervention was effective in GWBB, providing low-impact exercises to improve postural control and thus leading to improved motor skills in children with DS.

Relación entre control postural y desarrollo motor en niños con síndrome de down y con desarrollo típico de Chillán / Relationship between postural control and motor development in children with down syndrome and with typical development of Chillán

El objetivo de esta investigación es relacionar el desarrollo motor y control postural en niños con Síndrome de Down de la ciudad de Chillán. La investigación tiene un diseño no experimental, transeccional, correlacional. La muestra intencionada no probabilística está constituida por un total de 36 niños entre 6 y 12 años con Síndrome de Down (n=16) y con Desarrollo Típico (n=20). Se evalúo el desarrollo motor grueso por medio del Test of Gross Development (Ulrich, 2000), y control postural mediante una plataforma Wii Balance Board (Rey-Martinez & Perez-Fernandez, 2016) calculando el área de desplazamiento del centro de presiones en posición estática con ojos abiertos y cerrados. Los resultados muestran diferencias significativas entre ambos grupos tanto en desarrollo motor como control postural (p<0,05) siendo mejores en el grupo de desarrollo típico. No se encontró una co-rrelación entre control postural y desarrollo motor en el grupo de niños con Síndrome de Down. En conclusión, los niños con Síndrome de Down presentan un retraso en el control postural y desarrollo motor en comparación a los niños con desarrollo típico, sin embargo, es necesario realizar más inves-tigación para determinar la relación entre ambas variables.

The objective of this research is to relate motor development and postural control in children with Down syndrome in the city of Chillán. The research has a non-experimental, transactional, correlational design. The sample is non-probabilistic intentional and consists of a total of 36 children between 6 and 12 years old with Down Syndrome (n = 16) and with Typical Development (n = 20). The gross motor development was evaluated through the Test of Gross Development (Ulrich, 2000), and postu-ral control through a Wii Balance Board platform (Rey-Martinez & Perez-Fernandez, 2016) calcula-ting the displacement area of the center of pressures in position static with open and closed eyes. The results show significant differences between the two groups both in motor development and postural control (p <0.05), being better in the typical development group. Not found a correlation between pos-tural control and motor development in children with Down Syndrome group. In conclusion, children with Down syndrome show a delay in postural control and motor development compared to children with typical development, however, it's necessary to carry out further research to determine the rela-tionship between the two variables.

[Effect of an intervention based on virtual reality on motor development and postural control in children with Down Syndrome]. / Efecto de una intervención basada en realidad virtual sobre las habi lidades motrices básicas y control postural de niños con Síndrome de Down.

There are few studies on the effect of a virtual reality-based intervention on motor development and postural control in children with Down Syndrome (DS). OBJECTIVE: To determine the effect of a virtual reality-based intervention on motor development and postural control in children with DS. PATIENTS AND METHOD: Study with a quantitative approach, with a quasi-experimental design, which included 16 children with DS randomly assigned to an experimental group (GWBB, n = 9) and con trol group (GC, n = 7). Postural control was evaluated by the center of pressure displacement and motor development with TGMD-2. The intervention program was carried out for five weeks, two times per week. The data were subjected to statistical analysis, the Shapiro Wilk test for the sample distribution, and the Student's T-test for the comparison of group means. RESULTS: Significant chan ges were observed in the TGMD-2 Test and its manipulation subtest (p <0.01) respectively. In the rest of the tests, there was an improvement, but no significant differences were observed. CONCLUSION: A virtual reality-based intervention was effective in GWBB, providing low-impact exercises to improve postural control and thus leading to improved motor skills in children with DS.