Quantification of lumbar function. Part 4: Isometric and isokinetic lifting simulation in normal subjects and low-back dysfunction patients.

The present study collected the first normative data on a new dynamic isokinetic lifting device and compared a normal subject sample (n = 65) with a chronic low-back pain patient sample (n = 68) on this device. In addition, a comparison was made between isometric lifting measures collected for these controls and patients, and a normative industrial sample used in an earlier isometric testing protocol. Results demonstrated significant differences between controls and patients on all measures. An unanticipated finding was the greater lifting capacity levels of the present normal sample relative to those reported in the earlier isometric testing. These findings demonstrate that dynamic lifting simulation offers an important new tool for medical and industrial assessment, and conservative medical management.