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Reliability and Validity of a Portable Traction Dynamometer in Knee-Strength Extension Tests: An Isometric Strength Assessment in Recreationally Active Men

Healthcare (Basel, Switzerland) · 2023 · Vol 11(10)

Dr. Nicholas Rolnick · Co-author

Abstract

Background. the study determined the validity and reliability of measurements obtained using the portable traction dynamometer (PTD) (E-Lastic, E-Sports Solutions, Brazil) and the reproducibility between evaluators (precision) in the evaluation of the isometric muscle strength of the knee extensors of healthy male adults, compared to measurements obtained with the "gold standard" computerized dynamometer (CD) (Biodex System 3, Nova York, NY, USA).

Methods. we evaluated sixteen recreationally active men (29.50 ± 7.26 years). The test-retest reliability of both equipment to determine quadriceps strength, agreement analysis, and the minimal important difference were verified.

Results. excellent test-retest interrater reliability was observed for absolute and relative measurements, with a low absolute error for both sets of equipment and excellent validity of the PTD against the CD, as verified by linear regression and Pearson's correlation coefficient.

Conclusions. PTD is a valid and reliable instrument for assessing the isometric strength of knee extensors, with results similar to the isometric CD "gold standard".

Authors

Danielle Garcia, Ivo Vieira de Sousa Neto, Yuri de Souza Monteiro, Denis Pinheiro Magalhães, Gleison Miguel Lissemerki Ferreira, Roberto Grisa, Jonato Prestes, Bruno Viana Rosa, Odilon Abrahin, Tatiane Meire Martins, Samuel Estevam Vidal, Rosimeire de Moura Andrade, Rodrigo Souza Celes, Nicholas Rolnick, Dahan da Cunha Nascimento

Dr. Nicholas Rolnick’s contribution: Co-author

Keywords

  • isometric
  • knee extension
  • portable traction dynamometer
  • reliability
  • validity

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Cite this paper

Danielle Garcia, Ivo Vieira de Sousa Neto, Yuri de Souza Monteiro, Denis Pinheiro Magalhães, Gleison Miguel Lissemerki Ferreira, Roberto Grisa, Jonato Prestes, Bruno Viana Rosa, Odilon Abrahin, Tatiane Meire Martins, Samuel Estevam Vidal, Rosimeire de Moura Andrade, Rodrigo Souza Celes, Nicholas Rolnick, Dahan da Cunha Nascimento. (2023). Reliability and Validity of a Portable Traction Dynamometer in Knee-Strength Extension Tests: An Isometric Strength Assessment in Recreationally Active Men. Healthcare (Basel, Switzerland), 11(10). https://doi.org/10.3390/healthcare11101466

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