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Phys Ther Sport. 2015 Feb;16(1):59-65. doi: 10.1016/j.ptsp.2014.04.004. Epub 2014 May 15.

Inter-machine reliability of the Biodex and Cybex isokinetic dynamometers for knee flexor/extensor isometric, concentric and eccentric tests.

Author information

1
Exercise Research Laboratory (LAPEX), Federal University of Rio Grande do Sul (UFRGS), Rua Felizardo, 750, Bairro Jardim Botânico, CEP: 90690-200 Porto Alegre, RS, Brazil.
2
Exercise Research Laboratory (LAPEX), Federal University of Rio Grande do Sul (UFRGS), Rua Felizardo, 750, Bairro Jardim Botânico, CEP: 90690-200 Porto Alegre, RS, Brazil. Electronic address: bmbaroni@yahoo.com.br.

Abstract

OBJECTIVES:

To assess the inter-machine reliability of the Biodex System 3 Pro and Cybex Humac Norm Model 770 dynamometers for knee extensor and knee flexor peak torque measurements in isometric, concentric and eccentric tests.

DESIGN:

Randomized/crossover.

SETTING:

Exercise Research Laboratory, Federal University of Rio Grande do Sul (Brazil).

PARTICIPANTS:

25 healthy male subjects.

MAIN OUTCOME MEASURES:

Isometric, concentric and eccentric knee extensor and knee flexor peak torques recorded in the same test procedure performed on both isokinetic dynamometers. One-way ANOVA, intraclass correlation coefficient (ICC), standard error of measurement (SEM) and coefficient of variation (CV) were used to verify significant differences, relative and absolute reliability between devices.

RESULTS:

No significant differences were found between tests performed on Biodex and Cybex (p > 0.05). ICC values indicated a high to very high reproducibility for isometric, concentric and eccentric peak torques (0.88-0.92), and moderate to high reliability for agonist-antagonist strength ratios (0.62-0.73). Peak torque did not show great difference between dynamometers for SEM (3.72-11.27 Nm) and CV (5.27-7.77%). Strength ratios presented CV values of 8.57-10.72%.

CONCLUSION:

Maximal knee extensor and knee flexor tests performed in isometric (60° of knee flexion), concentric and eccentric modes at 60°/s in Biodex and Cybex dynamometers present similar values.

KEYWORDS:

Hamstring; Isokinetic dynamometry; Quadriceps; Test–retest

PMID:
24913915
DOI:
10.1016/j.ptsp.2014.04.004
[Indexed for MEDLINE]

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