Normative Data for lsostation B100.

The purpose of this study was the gathering of normative data on the low back for normal males and females utilizing the lsostation BlOO (Isotechnologies, Hillsborough, NC). Included in the study were 110 males and 50 females who were evaluated in a series of four tests. Data were gathered three-dimensionally for the following: a) range of motion with light resistance in flexion/extension, rotation to right and left, and lateral flexion to right and left; b) repetitive flexion/extension for a 20-second time period at a light resistance; c) repetitive flexion/extension for 20 seconds with a heavy resistance; and d) a modified maximum lift. In all tests, males had higher values than females; however, females had greater standard deviations than males in all tests. Thus, there were some females who had higher values than some males. There were weak correlations between peak torque output in the flexion/extension axes in relation to height and body weight in tests a and b where light resistance was used. For tests c and d the correlation improved. Also of interest, consistent activity was noted on the torque and range of motion graphs of rotation and lateral flexion during repetitive flexion/extension tests. These patterned torques and ranges of motion noted in rotation and lateral flexion coincide with the graph patterns of flexion/extension. This accessory motion may be indicative of effort or pathology. Crossover activity needs to be researched further as a possible determinant of effort levels and three-dimensional reproducibility. J Orthop Sports Phys Ther 1987;9(4):141-155.