This study presents the dynamic load characteristics of chiropractors delivering posterior to anterior double thenar thoracic spinal manipulations to a mannequin. A total of 36 thrusts were delivered by the three chiropractors to a mannequin that has similar shape and texture of a human. Two three-dimensional force transducers were used between the doctor's hand and the mannequin. Parameters of the duration, rate of loading, preload and peak loads were extracted from the data for the three chiropractors. Average peak loads in the normal direction reached 247 N and 217N in the right and left hands. The shear forces reached 36 and 18N in the right and left hand. The rates of loading have reached 804N/s and 761N/s in the right and left hands. Average durations of thrust were 242msecs. The three doctors had distinct characteristics in pre loads, durations of loading and rates of loading.
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