20
views
0
recommends
+1 Recommend
0 collections
    0
    shares
      • Record: found
      • Abstract: found
      • Article: found
      Is Open Access

      Testing a novel isokinetic dynamometer constructed using a 1080 Quantum

      research-article

      Read this article at

      Bookmark
          There is no author summary for this article yet. Authors can add summaries to their articles on ScienceOpen to make them more accessible to a non-specialist audience.

          Abstract

          This study sought to assess the reliability and comparability of two custom-built isokinetic dynamometers (Model A and Model B) with the gold-standard (Humac Norm). The two custom-built dynamometers consisted of commercially available leg extension machines attached to a robotically controlled resistance device (1080 Quantum), able to measure power, force and velocity outputs. Twenty subjects (14m/6f, 26±4.8yr, 176±7cm, 74.4±12.4kg) performed concentric leg extensions on the custom-built dynamometers and the Humac Norm. Fifteen maximal leg extensions were performed with each leg at 180° s -1, or the linear equivalent (~0.5m s -1). Peak power (W), mean power (W), and fatigue indexes (%) achieved on all three devices were compared. Both custom-built dynamometers revealed high reliability for peak and mean power on repeated tests (ICC>0.88). Coefficient of variation (CV) and standard error of measurement (SEM) were small when comparing power outputs obtained using Model A and the Humac Norm (

          CV = 9.0%,
          SEM = 49W; peak CV = 8.4%, peak SEM = 49W). Whereas, Model B had greater variance (
          CV = 13.3%
          SEM = 120W; peak CV = 14.7%, peak SEM = 146W). The custom-built dynamometers are capable of highly reliable measures, but absolute power outputs varied depending on the leg extension model. Consistent use of a single model offers reliable results for tracking muscular performance over time or testing an intervention.

          Related collections

          Most cited references21

          • Record: found
          • Abstract: found
          • Article: not found

          Reliability and validity of the Biodex system 3 pro isokinetic dynamometer velocity, torque and position measurements.

          This study quantitatively assessed the mechanical reliability and validity of position, torque and velocity measurements of the Biodex System 3 isokinetic dynamometer. Trial-to-trial and day-to-day reliability were assessed during three trials on two separate days. To assess instrument validity, measurement of each variable using the Biodex System 3 dynamometer was compared to a criterion measure of position, torque and velocity. Position was assessed at 5 degrees increments across the available range of motion of the dynamometer. Torque measures were assessed isometrically by hanging six different calibrated weights from the lever arm. Velocity was assessed (30 degrees/s to 500 degrees/s) across a 70 degrees arc of motion by manually accelerating the weighted lever arm. With the exception of a systematic decrease in velocity at speeds of 300 degrees/s and higher, the Biodex System 3 performed with acceptable mechanical reliability and validity on all variables tested.
            Bookmark
            • Record: found
            • Abstract: found
            • Article: not found

            Test-retest reliability of isokinetic knee extension and flexion.

            To assess reliability of isokinetic peak torque and work for knee flexion and extension. Single-group test-retest. University laboratory. Eleven men and 7 women (mean age, 21 y). Not applicable. Peak torque and work for concentric and eccentric knee extension and flexion were recorded at 60 degrees/s for 3 trials on 2 occasions. Intraclass correlation coefficient model 3,1 (ICC(3,1)), standard error (SE) of measurements, and smallest real differences were calculated for the maximum and for the mean peak torque and work of the 3 repetitions. Relative reliability was "very high" for peak torque and work (ICC range, >.90). The SE measurements ranged between 5% and 10% of the initial values for both peak torque and work. The smallest change that indicates a real improvement for a single subject (smallest real differences) ranged from 12% to 25% for peak torque and work variables and from 25% to 30% for the peak torque ratios. Isokinetic concentric and eccentric knee extensor and flexor strength variables are reliable when measured by the same examiner in asymptomatic subjects.
              Bookmark
              • Record: found
              • Abstract: found
              • Article: not found

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

              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.
                Bookmark

                Author and article information

                Contributors
                Role: Data curationRole: Formal analysisRole: InvestigationRole: MethodologyRole: Project administrationRole: ResourcesRole: SoftwareRole: SupervisionRole: ValidationRole: VisualizationRole: Writing – original draftRole: Writing – review & editing
                Role: Writing – review & editing
                Role: Formal analysisRole: MethodologyRole: ResourcesRole: SoftwareRole: Writing – review & editing
                Role: ConceptualizationRole: Funding acquisitionRole: MethodologyRole: ResourcesRole: SupervisionRole: VisualizationRole: Writing – review & editing
                Role: Editor
                Journal
                PLoS One
                PLoS ONE
                plos
                plosone
                PLoS ONE
                Public Library of Science (San Francisco, CA USA )
                1932-6203
                20 July 2018
                2018
                : 13
                : 7
                : e0201179
                Affiliations
                [1 ] Department of Human Health and Nutritional Sciences, Human Performance and Health Research Laboratory, University of Guelph, Guelph, Ontario, Canada
                [2 ] Department of Human Health and Nutritional Sciences, Neuromechanical Performance Research Laboratory, University of Guelph, Guelph, Ontario, Canada
                Univerzitet u Beogradu, SERBIA
                Author notes

                Competing Interests: The authors have declared that no competing interests exist.

                Author information
                http://orcid.org/0000-0001-9823-6406
                http://orcid.org/0000-0002-5449-3352
                Article
                PONE-D-17-23782
                10.1371/journal.pone.0201179
                6054416
                30028864
                3dee0c09-07de-4f92-9ed3-faef9dc740df
                © 2018 Whinton et al

                This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

                History
                : 22 June 2017
                : 10 July 2018
                Page count
                Figures: 4, Tables: 2, Pages: 11
                Funding
                Funded by: funder-id http://dx.doi.org/10.13039/501100000038, Natural Sciences and Engineering Research Council of Canada;
                Award ID: 03974
                Award Recipient :
                The laboratory was supported by the Natural Sciences and Engineering Research Council of Canada (Discovery Grant Number: 03974).
                Categories
                Research Article
                Biology and Life Sciences
                Anatomy
                Musculoskeletal System
                Limbs (Anatomy)
                Legs
                Medicine and Health Sciences
                Anatomy
                Musculoskeletal System
                Limbs (Anatomy)
                Legs
                Research and Analysis Methods
                Research Assessment
                Research Validity
                Physical Sciences
                Physics
                Classical Mechanics
                Motion
                Velocity
                Engineering and Technology
                Equipment
                Medicine and Health Sciences
                Public and Occupational Health
                Physical Activity
                Physical Fitness
                Exercise
                Medicine and Health Sciences
                Sports and Exercise Medicine
                Exercise
                Biology and Life Sciences
                Sports Science
                Sports and Exercise Medicine
                Exercise
                Physical Sciences
                Physics
                Classical Mechanics
                Motion
                Physical Sciences
                Physics
                Classical Mechanics
                Damage Mechanics
                Material Fatigue
                Physical Sciences
                Materials Science
                Materials Physics
                Material Fatigue
                Physical Sciences
                Physics
                Materials Physics
                Material Fatigue
                Physical Sciences
                Physics
                Classical Mechanics
                Motion
                Torque
                Custom metadata
                All relevant data are within the paper and its Supporting Information files.

                Uncategorized
                Uncategorized

                Comments

                Comment on this article