1. Intramachine and intermachine reproducibility of concentric performance: a study of the Con-Trex MJ and the Cybex Norm dynamometers.
- Author
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Bardis C, Kalamara E, Loucaides G, Michaelides M, and Tsaklis P
- Abstract
Introduction: There is minimal information in the literature concerning the intramachine reliability of the new Isokinetic dynamometer Con-Trex MJ, and the intermachine reproducibility of this instrument with the Cybex Norm isokinetic dynamometer.Objective: The purpose of this study was to provide some insight with regard to the reproducibility of Con-Trex MJ in measuring the knee muscle performance in flexion and extension (concentric) and to compare the variability of measurement between Con-Trex and Cybex Norm.Methods: 35 (70 legs) male subjects with no previous history of any knee pathology volunteered for the study. Intramachine reproducibility was evaluated by assessing 30 legs twice on the Con-Trex MJ, within 2 to 7 days, at angular velocities of 60 degrees, 180 degrees and 300 degrees/sec. Intermachine reproducibility was evaluated by assessing 40 legs randomly on the Con-Trex MJ and Cybex Norm within 2 to 7 days at 60 degrees and 180 degrees/sec. Coefficient of variation (CV) was used to determine the reproducibility of repeated measurements at p< 0.01. Results: Intra: The variability of measurements of Con-Trex for Peak Torque, was 5.19-5.68% for extension and 4.84-7.33% for flexion depending on the angular velocity. This is acceptable for clinical and research studies. Inter: Between the two Isokinetic devices there was a greater CV for Peak Torque ranging 7.28-9.17% for extension and 8.54-15.84% for flexion.Conclusion: Based on the results of the present study, comparisons of results between the two devices may not be valid. The results for knee flexion and extension measurements at 60 degrees and 180 degrees/sec recorded with Con-Trex were consistently greater than the values recorded with the Cybex Norm. [ABSTRACT FROM AUTHOR]
- Published
- 2004
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