Figure 1
Photographs of the experimental equipment. A) a participant in the neutral position in preparation for an Extension test. B) a participant in the extended position. The CA-6000 linkage measures head position relative to the base affixed at the first thoracic vertebra. Matching Lucite blocks, one attached to the headband of the CA-6000, and the other attached to the load cell, provide for alignment during the neck extension. In this position the patient can exert force against the load cell for measuring maximum voluntary contraction during the "Active Hold" conditioning.