Confiabilidad entre instrumentos (T-Force® y Myotest®) en la valoración de la fuerza

  1. Gómez-Píriz, Pedro Tomás
  2. Trigo Sánchez, María Eva
  3. Cabello Manrique, David
  4. Puga González, Esther
Journal:
RICYDE. Revista Internacional de Ciencias del Deporte

ISSN: 1885-3137

Year of publication: 2012

Volume: 8

Issue: 27

Pages: 20-30

Type: Article

DOI: 10.5232/RICYDE2012.02702 DIALNET GOOGLE SCHOLAR lock_openDialnet editor

More publications in: RICYDE. Revista Internacional de Ciencias del Deporte

Abstract

The purpose of this study was to determine the inter-machine reliability of two devices routinely used to measure variables in sports performance: the linear position measuring device (LPM, isoinertial dynamometer T-Force) and the (AC) 3-D accelerometer (Myotest Sport, S4P model). 40 bench press exercises (25 kg) were analysed at concentric contraction phase and at maximum velocity, carried out by three different subjects (age: 26.74 ± 1.2 years, height: 175.74 ± 4.04 cm, weight: 78.7 ± 3.35 kg). Variables analysed comprised maximum velocity, maximum estimated force and estimated peak power. The data from both devices was collected simultaneously. Three simple lineal regression models were developed, supplied by the linear position measuring device (LPM) on the basis of the accelerometer´s (AC) data. The assumption of independence of errors was compared by means of the Durbin-Watson test. Partial autocorrelation coefficients were calculated for a p<.05 significance level. It has not been possible to confirm the presence of a general correlation between the measurements of both devices. The data was characterised by a generalised autocorrelation and it is recommended that strategies reflecting error control resulting from the data dependence factor be applied when measuring an athlete´s performance. An inter-machine correlation was only found in one of the non conclusive cases: (Peak Power) variable and subject 1, r(10) = .64, p = .024. No partial autocorrelation was found. The AC device obtained higher average and dispersion values than the LPM device. The results show the probability of an increase to the value of uncertainty of the AC device measurements in accordance with Metrology specified guidelines. Both devices should not be used interchangeably when assessing and monitoring training.

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