title: Validation of the force and frequency characteristics of the activator adjusting instrument: effectiveness as a mechanical impedance measurement tool.
authors.forename: J
authors.initials: J
authors.lastname: Drinkwater
mesh_terms: D001696:Biomechanical Phenomena; D002684:Chiropractic / Q000295:instrumentation*; D006801:Humans; D007802:Language; D020393:Manipulation, Spinal; D015203:Reproducibility of Results; D013131:Spine / Q000502:physiology