Subject: The Activator Adjusting Instrument – Biomechanical


Reference: Tony S. Keller;  J.B. Lehneman…Musculoskeletal Research Lab, February 1994: pp.1-16


Introduction: The Activator Adjusting Instrument  (AAI) is a devise used for chiropractic manipulations. The device is  intended to produce repeatable impacts (manipulations) at various force  settings. The force is easily adjusted by turning the small knob on the  lower part of the device.


Objective: The purpose of this study is to determine  the effect of the force setting, and preload on the actual force  delivered by the AAi to the impact surface.