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Reliability and validity of the Biodex system 3 pro isokinetic dynamometer velocity,torque and position measurements
Authors:Joshua?M.?Drouin  mailto:jdrouin@gasou.edu"   title="  jdrouin@gasou.edu"   itemprop="  email"   data-track="  click"   data-track-action="  Email author"   data-track-label="  "  >Email author,Tamara?C.?Valovich-mcLeod,Sandra?J.?Shultz,Bruce?M.?Gansneder,David?H.?Perrin
Affiliation:(1) Department of Public Health, Georgia Southern University, PO Box 8076, Statesboro, GA 30460-8076, USA;(2) Department of Sports Health Care, Arizona School of Health Sciences, 5850 E. Still Circle, Mesa, AZ 85206, USA;(3) Department of Exercise and Sports Science, University of North Carolina, 237B HHP Building, PO Box 26170, Greensboro, NC 27402-6170, USA;(4) Department of Education, Leadership and Foundations, University of Virginia, Rm. 268 Ruffner Hall, Charlottesville, VA 22904, USA;(5) School of Health and Human Performance, University of North Carolina at Greensboro, 400-A HHP Building, PO Box 26169, Greensboro, NC 27402-6169, USA
Abstract:
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° 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°/s to 500°/s) across a 70° arc of motion by manually accelerating the weighted lever arm. With the exception of a systematic decrease in velocity at speeds of 300°/s and higher, the Biodex System 3 performed with acceptable mechanical reliability and validity on all variables tested.DisclosureThe Biodex dynamometer used for this investigation was donated to the laboratory by Biodex Medical Systems. The authors have no commercial or proprietary interest in this device.
Keywords:Muscle function  Muscle testing  Reliability  Validity
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