A physical therapy vibratory table having a base and a platform disposed above the base and attached to the base by at least one inflatable bladder. A source of pressurized compressible fluid is fluidly connected through a pressure regulator to the bladder while a vibratory motor is attached to the platform. A circuit controls the inflation of the bladder so that the platform is maintained at the same distance relative to the base despite the magnitude of the load imposed on the platform.