Leg length test reliability Īlthough prone "functional leg length" is a widely used chiropractic tool, it is not a recognized anthropometric technique, since legs are often naturally of unequal length, and measurements in the prone position are not entirely valid estimates of standing X-ray differences. It is the first FDA registered and approved cordless electronic chiropractic adjustment instrument. Īctivator V is the newest iteration of Activator products and is a cordless instrument capable of delivering its own adjustment. This led to a better activation of mechanoreceptors when adjusting a specific segment of the spine. ![]() In 1994 the Activator II was first released when research at the University of Vermont found that when the initial instrument was given an impedance head it produced a "significant improvement in the frequency content" of the force delivered to the spine. Īctivator I was the first product patented by Activator Methods International on September 26, 1978. The design of the tool was based on a dental impactor. The aim is to produce enough force to move the vertebrae, but not enough to cause injury. It was found to give off no more than 0.3 J of kinetic energy in a 3-millisecond pulse. With the release of the Activator V this process has changed from a spring-loaded grip to an electronic tool which delivers the mechanical force. ![]() The traditional Activator Adjusting Instrument (AAI), or more simply, Activator, is a small handheld spring-loaded instrument which delivers a controlled and reproducible impulse to the spine.
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