Psychometric properties of the learning perception questionnaire in Mexican's students.

The aim of this study is to analyze the psychometric properties of the learning perception questionnaire (CPA) presented in this research. It was administered to a total of 1496 students in Baja California and Nuevo León, of the total sample, 748 were girls (Mage = 14.0, SD = 0.3), and 748 boys (Age = 14.1, SD = 0.3). The analyses support the hypothesized theoretical model of origin, presenting an acceptable internal consistency and temporal stability. The model fit data was excellent; furthermore, the examined model meets the convergent validity requirements. External validity was explored by examining the predictive relationship of the scale studied with Satisfaction with School. The CPA has a strong predictive relationship with student satisfaction/fun in class, while it is negative with boredom. Thus, the higher the perception of learning, the less likely that students will be bored in class. It is concluded, therefore, that the CPA scale is a proven instrument and that it serves to assess the perception of key learning by secondary school students.

Biomechanics Assessment of Kinematic Parameters of Low-Sprint Start in High-Performance Athletes Using Three Dimensional Motion Capture System

ABSTRACT In a sprint start, the athlete takes up a position with their hands just behind a line, arms vertical, feet generally placed about a shoe length apart, and the hips rising above the line of the head. Mistakes in this position influence the execution of the low-sprint start, and can drastically influence the initial running speed and acceleration achieved by the athlete. Common mistakes occur due to the misconception that athletes must also lean forward, bringing the shoulders ahead of their hands and putting pressure on them. A standard approach to identify sprint start mistakes is to use a stick or weighted string to drop down from the shoulders. The effective implementation of this approach depends on the coach's experience and remains a significant challenge. In this study, a three-dimensional motion capture system with the Vicon® Plug-in-Gait model was used to characterize the kinematic parameters that influence the execution of low-sprint start in six high-performance athletes. The main kinematic parameters are reaction time, stride length, and stride time. The obtained results demonstrate the potential utility of a three-dimensional motion capture system to assess the kinematic parameters of low-sprint start in high-performance athletes.

Somatotype profile and body composition of players from the Mexican professional basketball league / Perfil somatotípico y composición corporal de jugadores de la liga mexicana de básquetbol profesional

The purpose of this research was to determine the somatotype profile and body composition of team members of Soles de Mexicali from the Mexican professional basketball league season 2012. A descriptive cross-sectional study in which 10 members of that team are evaluated to determine the somatotype and body composition, they were assessed with anthropometric variables in accordance with ISAK (International Society for the Advancement of Kinanthropometry was performed) the equipment used was the Tom Kit Rosscraft Inc. The somatotype and body composition were determined through measurements of body weight (cm), height (cm), eight skinfolds (mm) triceps, sub scapular, biceps, iliac crest, supra spinal, abdominal, front thigh, medial calf, eleven circumferences (cm) arm relaxed, flexed arm, forearm, wrist, chest, low waist, high hip, thigh, buttock 1 cm, mid-thigh, calf and ankle, and two bone diameters (cm) humeral and femur. The data were processed or through Life Size Software Sports Scientific Reynolds. The following data are reported in the first reference of the Mexican league players assessed a somatotype 2.94­6.35­2.06 average and the percentage of body fat of the subjects tested was 14.46%. The values found in this study indicate a significant an optimal state of body fat percentage and somatotype similar when is compared with existing studies on national teams and international basketball.

El propósito fue determinar el somatotipo y composición corporal de los integrantes del equipo de basketball Soles de Mexicali temporada 2012. Se realizó un estudio transversal descriptivo en el que se evaluó a los 10 integrantes, para determinar el porcentaje de grasa corporal se utilizó el método antropométrico de acuerdo con las técnicas establecidas por la ISAK (Sociedad Internacional para el Avance de la Kineantropometría). El equipo utilizado fue el Tom Kit de Rosscraft Inc. Recomendado por la ISAK para la aplicación de mediciones y que consta de calibrador de pliegues cutáneos Slim Guide, vernier de diámetros óseos, cinta métrica metálica tipo Lufkin, además de estadímetro y bascula. Se tomaron las siguientes mediciones masa corporal: estatura, 8 panículos adiposos (tríceps, subescapular, bíceps, iliocrestal, supraespinal, abdominal, muslo frontal, pierna medial), 11 circunferencias (brazo relajado, brazo flexionado, antebrazo, muñeca, tórax, cintura mínima, cadera máxima, muslo a 1 cm del glúteo, muslo medio, pantorrilla y tobillo) y 2 diámetros óseos (húmero y fémur). Los datos o fueron procesados por medio del software LifeSize de Nolds Sports Scientific determinando el porcentaje de grasa corporal. Los datos obtenidos son la primer referencia reportada en basquetbolistas de la liga mexicana determinados un somatotipo promedio de 2,94­6,35­2,06 y el porcentaje de grasa corporal promedio fue de 14.46%. Los valores encontrados en el presente estudio indican un considerable estado óptimo de porcentaje de grasa y similitud al compararlos con estudios existentes a equipos de basketball nacional e internacional.