Method and apparatus for testing or exercising muscles of the lower trunk of the human body

Abstract From the Canadian patent

Methods and apparatus for exercising or testing the strength of muscles in the lower trunk of the human body. The patient or exerciser is seated with his pelvis and legs fixed against movement and with his head, arms and upper back fixed relative to a movement arm which extends above the seat and is mounted for pivotal movement relative to the seat about a horizontal axis. While the movement arm is in a predetermined position the, patient applies a force through the upper back to the movement arm to stress the muscles of the lower trunk and the strength of, these muscles is measured. To exercise these muscles the, movement arm is moved by a force exerted by the upper back against a bias of …