Peak Torque Comparison between iSAM 9000 and Biodex Isokinetic Devices
J. Chadwick Smith, Gibson F. Darden

Isokinetic dynamometers (new and updated) need to clearly establish validity and reliability. The iSAM 9000 (iSAM), a newer isokinetic device, generates a strength index score to qualify job candidates to reduce injury incidence. Further data is needed to better inform the use of isokinetic dynamometry for this purpose, across different isokinetic devices. This study compared peak torque values between isokinetic devices (iSAM and Biodex) for concentric shoulder and knee flexion and extension, and also assessed reliability and coefficients of variation (CV) in strength scores. Test-retest reliability was measured by thirty-six healthy participants completing two different sessions (5 repetitions each joint) on each device for both shoulder and knee movements. Using the average of the three best readings, results showed the iSAM produced less peak torque for the majority of knee movements, and more peak torque for shoulder flexion compared to the Biodex. There was a larger CV for right knee flexion, left and right shoulder extension produced by the iSAM compared to the Biodex. Test-retest reliability was high (r>0.75), as indicated by correlation coefficients. Despite both devices having good reliability, there were significant differences in peak torques produced. Caution is warranted when comparing results obtained across isokinetic devices.

Full Text: PDF     DOI: 10.15640/ijhs.v4n3a2