David Cabello Manrique

Reliability and comparability of the accelerometer and the linear position measuring device in resistance training.

Abstract Gomez-Piriz, PT, Sanchez, ET, Manrique, DC, and Gonzalez, EP. Reliability and comparability of the accelerometer and the linear position measuring device in resistance training. J Strength Cond Res 27(6): 1664–1670, 2013—The purpose of this study was to determine the intermachine reliability attained from devices used to measure the common variables in sports performance. Repeatability conditions were established by creating a similar set of conditions under which the measurements were taken from both devices. The objectives of this research were to demonstrate the reliability between two devices in a bench press movement—the linear position measuring device (LPM) isoinertial dynamometer (T-Force) and the 3D (Myotest) accelerometer (AC)—and to compare the existing correlations between maximum velocity, maximum estimated strength, and peak power estimate variables in the bench press exercise. Forty bench press exercise trials were analyzed simultaneously, performed by 3 different subjects (age: 26.74 ± 1.2 years, height: 175.74 ± 4.04 cm, weight: 78.7 ± 3.35 kg) at maximum velocity (25 kg additional load). Three simple linear regression models were developed, supplied by the LPM on the basis of the AC data. The assumption of independence of errors was compared by means of the Durban-Watson test, and partial autocorrelation coefficients were established at an overall p < 0.05 significance level. It has not been possible to confirm the presence of a general correlation between the measurements of both devices. Regarding the assumption of independence of errors, the presence of generalized autocorrelation was confirmed. Linear regression analysis revealed an intermachine correlation in one of the nonconclusive cases, (peak power) variable and subject 1, r (10) = 0.640, p = 0.024. No partial autocorrelation was found. The devices should not be used interchangeably as instruments.

Estudio del pie del jugador de bádminton

Resumen El badminton es un deporte donde la gran mayoria de las lesiones se producen a nivel de las extremidades inferiores, siendo generalmente de poca gravedad y localizadas en el pie. El desarrollo del juego consiste en la ejecucion de desplazamientos cortos y rapidos por lo que las estructuras morfologicas del pie debe deben estar sujetadas por un calzado adecuado que amortigue los posibles efectos de saltos, desplazamientos laterales y fricciones con la superficie de juego. El estudio se realizo con una muestra de 84 jugadores (10-35 anos), que participan en competiciones nacionales de su categoria y de nivel de juego medio-alto nacional. La toma de muestras se realizo a lo largo de diferentes competiciones, de caracter nacional e internacional y en sesiones de entrenamiento, a traves de un estudio morfologico del pie-pierna, estudio dinamico de la marcha e historial medico de lesiones en las extremidades inferiores. La morfologia mas comun encontrada es el pie cavo, con una formula digital griega (52%) y con un 79% de insuficiencias metatarsales del 1° y 5° metatarsiano. Ademas de una varizacion de retropie (linea de Helbing vara 40%) y un genus varo del 40% en el plano longitudinal. Tambien encontramos un exceso de pronacion en la marcha en las categorias inferiores y un exceso de supinacion del retropie en las categorias superiores, con numerosas on|copatias y queratopatias, esguinces de tobillo, tendinitis y metatarsalgias. Destaca la diferente distribucion de las lesiones por categorias, con baja incidencia en categorias inferiores y un alto grado en las categorias superiores. Asi, un adecuado seguimiento del desarrollo morfologico y estructural del pie a lo largo de la vida del jugador de badminton, seria un factor determinante para la prevencion de lesiones en el curso de su carrera deportiva.