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Reproducibility and Repeatability of Five Different Technologies for Bar Velocity Measurement in Resistance Training

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A Commentary to this article was published on 24 June 2019

A Commentary to this article was published on 11 June 2019

Abstract

This study aimed to analyze the agreement between five bar velocity monitoring devices, currently used in resistance training, to determine the most reliable device based on reproducibility (between-device agreement for a given trial) and repeatability (between-trial variation for each device). Seventeen resistance-trained men performed duplicate trials against seven increasing loads (20-30-40-50-60-70-80 kg) while obtaining mean, mean propulsive and peak velocity outcomes in the bench press, full squat and prone bench pull exercises. Measurements were simultaneously registered by two linear velocity transducers (LVT), two linear position transducers (LPT), two optoelectronic camera-based systems (OEC), two smartphone video-based systems (VBS) and one accelerometer (ACC). A comprehensive set of statistics for assessing reliability was used. Magnitude of errors was reported both in absolute (m s−1) and relative terms (%1RM), and included the smallest detectable change (SDC) and maximum errors (MaxError). LVT was the most reliable and sensitive device (SDC 0.02–0.06 m s−1, MaxError 3.4–7.1% 1RM) and the preferred reference to compare with other technologies. OEC and LPT were the second-best alternatives (SDC 0.06–0.11 m s−1), always considering the particular margins of error for each exercise and velocity outcome. ACC and VBS are not recommended given their substantial errors and uncertainty of the measurements (SDC > 0.13 m s−1).

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Authors and Affiliations

  1. Human Performance and Sports Science Laboratory, Faculty of Sport Sciences, University of Murcia, C/ Argentina s/n, Santiago de la Ribera, Murcia, Spain

    Javier Courel-Ibáñez, Alejandro Martínez-Cava, Ricardo Morán-Navarro, Pablo Escribano-Peñas & Jesús G. Pallarés

  2. Department of Physical Education, University of Las Palmas de Gran Canaria, Las Palmas de Gran Canaria, Spain

    Javier Chavarren-Cabrero

  3. Faculty of Sport, Pablo de Olavide University, Seville, Spain

    Juan José González-Badillo

Authors
  1. Javier Courel-Ibáñez
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  2. Alejandro Martínez-Cava
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  3. Ricardo Morán-Navarro
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  4. Pablo Escribano-Peñas
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  6. Juan José González-Badillo
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Correspondence to Jesús G. Pallarés.

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Associate Editor Stefan M. Duma oversaw the review of this article.

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Courel-Ibáñez, J., Martínez-Cava, A., Morán-Navarro, R. et al. Reproducibility and Repeatability of Five Different Technologies for Bar Velocity Measurement in Resistance Training. Ann Biomed Eng 47, 1523–1538 (2019). https://doi.org/10.1007/s10439-019-02265-6

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  • DOI: https://doi.org/10.1007/s10439-019-02265-6

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