The objective was to analyze anthropometric and physical performance variables as a function of chronological age and biological maturity in young Chilean tennis players. The study was observational, cross-sectional, with descriptive and analytical characteristics. Eighty-seven tennis players were evaluated (58 men 15.1 ± 0.8 years and 29 women, 15.3 ± 0.8 years). The measured anthropometric variables were a sprint test of 20m; a modified agility test; a sit-and-reach test and shoulder flexibility; manual grip strength; horizontal jump in feet; a medicine ball throw; a countermovement vertical jump; an abalakov vertical jump and a 20-m shuttle-run test. The growth velocity acceleration peak (APHV), skeletal muscle mass and fat mass were calculated, R2 and standard error of estimate (SEE) were examined. The results show that chronological age explained the anthropometric variables between 1 and 23% in men and 1 and 29% in women; by biological age, variables were explained between 3 and 53% in men and 2 and 42% in women. Of the physical performance variables, chronological age described between 2 and 24% of them in men and 1 and 29% in women; the same were explained by biological age between 1 and 19% in men and 1 and 26% in women. We conclude that anthropometric variables showed a better relationship with biological age, except for volume of fat tissue, while physical performance variables showed low association with both biological and chronological age.
In tennis, it is common for young male tennis players to spend several weeks away from their local training camps during the competition season, which could affect their performance. The purpose of the study was to analyze the effects of a six-week international tour on physical performance and body composition in young Chilean tennis players. Twenty-four men between the ages of 14 and 16 participated in this research. In body composition and anthropometric measurement, body weight, height, skinfolds, and perimeters were measured. Body fat percentage (BFP) and skeletal muscle mass (SMM) were calculated. For physical performance, 5-m and 10-m sprints, modified agility test (MAT test), countermovement jump (CMJ), and medicine ball throw (MBT) were evaluated. Results show that, in body composition, BFP and SMM significantly decreased post-tour (p < 0.05; effect sizes ranging from 0.23 to 0.33, respectively). In physical performance, agility and 5-m and 10-m sprints significantly decreased (p < 0.05, effect sizes ranging from −0.63 to 1.10). We conclude that after a six-week international tour, BFP, SMM, agility, and speed (linear sprint) tend to decrease significantly, with a greater effect in the sprint tests.
Pradenas, X.; Campos, M.; Contreras, M.; Puentes,D. & Luna, P. (2017). Comparación del desarrollo motor en escolares de 9 y 10 años de edad en clases de educación física y talleres deportivos extracurriculares. Revista Ciencias de la Actividad Física UCM, N° 18(2) julio-diciembre, 1-8. RESUMENLa investigación buscó determinar si existen diferencias en el desarrollo motor en escolares de 9 y 10 años, que participan únicamente de la clase de educación física, y aquellos que además de la clase, participan de talleres deportivos extracurriculares pertenecientes a colegios particulares subvencionados de Concepción. El estudio utilizó un enfoque cuantitativo, de carácter descriptivo, de corte transversal. La muestra fue de 71 escolares, de los cuales 48 pertenecen al Grupo Educación Física y 23 al Grupo Extracurricular. Para la evaluación se utilizó el Test TGMD-2 (Ulrich, 2000). Los resultados mostraron que existen diferencias significativas entre ambos grupos (p<0,05), observándose un mejor desarrollo motor en los escolares del Grupo Extracurricular. PALABRAS CLAVEDesarrollo motor, talleres deportivos extracurriculares, educación física. ABSTRACTThis research sought to determine if there are differences in motor development between 9 and 10 year old children who only participate in their physical education class and those who, in addition to this class, participate in extracurricular sports workshops offered by subsidized private schools in Concepción, Chile. The study used a quantitative, descriptive, cross-sectional approach. The sample was made up of 71 students, of which 48 belong to the Physical Education Group and 23 to the Extracurricular Group. The TGMD-2 Test was used for the evaluation (Ulrich, 2000). The results showed that there are significant differences between both groups (p <0.05), and where the students from Extracurricular Group showed better motor development.
El tenis es un tipo de deporte caracterizado por esfuerzos cortos e intermitentes, la evidencia apoya el argumento de que las capacidades funcionales como la fuerza, la potencia, la velocidad y la agilidad son necesarias para competir en los niveles más altos. La investigación buscó analizar la relación entre la agilidad y las variables antropométricas (peso y talla) en niños pertenecientes a una escuela de tenis privada de la provincia de Concepción. El estudio utilizó un enfoque cuantitativo, de carácter descriptivo correlacional, de corte transversal. La muestra de 28 niños, de entre ocho y 11 años de edad, fue seleccionada de forma no probabilística por conveniencia. Se evaluó el peso y la estatura como variables antropométricas; para evaluar la agilidad se utilizó el Test MAT (Modified Agility Test). Los resultados mostraron que el tiempo promedio obtenido para la Agilidad fue de 9,10±1,01 segundos y que existe una baja relación entre la agilidad y las variables antropométricas de peso (r=-.189; p=.336) y talla (r=-.176; p=.391). Se concluye que la agilidad presenta una baja relación con las variables antropométricas estudiadas.Abstract. Tennis is a type of sport characterized by short and intermittent efforts. Evidence supports the argument that functional abilities such as strength, power, speed, and agility are necessary to compete at the highest levels. This research sought to analyze the relationship between agility and anthropometric variables (weight and height) in children belonging to a private tennis school in the province of Concepción. The study used a quantitative, descriptive, correlational, cross-sectional approach. A sample of 28 children between eight and 11 years of age was selected employing a non-probabilistic sampling technique by convenience. Weight and height were evaluated as anthropometric variables; The MAT Test (Modified Agility Test) was used to evaluate Agility. Results showed that average time obtained for agility was 9.10 ± 1.01 seconds, showing a moderate correlation with the anthropometric variables of weight (r=,189; p=,336) and height (r=-,176; p=,391). In conclusion, agility has a low correlation with the anthropometric variables studied.
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