Trunk testing using a prototype Cybex II isokinetic dynamometer stabilization system

This pilot study represents Cybex II isokinetic dynamometer trunk testing on 160 subjects (98 males, 62 females). A prototype apparatus which provides stabilization in the standing (functional) position was used in the testing. The testing protocols were performed first for trunk flexion and then trunk extension. The protocols consisted of two isometric tests for 5 seconds at 0° trunk angle and 45° trunk angle followed by three repetitions each at the isokinetic speeds of 30, 60, 90, and 120° per second. Peak torque values were measured for the isometric tests, isokinetic data interpretation consisted of: peak torque, time rate of tension development, range of motion where peak torque occurred, and total work performed. The ratios of trunk flexors to extensors at each test were also calculated. The conclusion from this pilot study is that the use of an isokinetic testing of trunk musculature and establishing normative data provide clinically useful guidelines for sports screening, industrial medicine screening, and objective parameters for discharging patients with trunk dysfunction.