Abstract: The lifting capacity of a human subject is assessed through dynamic testing protocols utilizing a cylindrical robot that tracks the path of the lift and provides load position information to a data analysis system. The movable linkage of the cylindrical robot moves in a very low friction manner and is designed to be extremely lightweight, while having remarkable strength and rigidity to withstand bending moments and torsional effects. Thus, the apparatus permits three-dimensional lift testing of actual loads, including actual job loads, with the test subject experiencing the true feel and inertial effects of the load. Static force transducers and related means are provided to permit isometric testing.

Abstract: An improved hydraulic valve system particularly adapted for use in a hydraulic circuit of an exercise apparatus in order to more quickly equalize the high and low pressure sides of the hydraulic circuit when a load is removed therefrom. The valve system is adapted to allow the high pressure side after the force has ceased to open a relief valve so as to allow the low pressure side and the reservoir to quickly come into equilibrium with the high pressure side. In this fashion, the tendency of the base line pressure to be elevated during repetitive exercises is obviated and accurate exercise data can be accumulated.

Abstract: An improved pelvic restraint is provided for use in association with an exercise apparatus which is most suitably a low back exercise apparatus. The pelvic restraint comprises a seat having laterally adjustable hip restraints provided with a belt for extending therebetween across the abdomen of a user. An adjustable back restraint is also provided for engagement with the lower back. In this fashion, the pelvic restraint prevents lifting or lateral shifting of the hips and forward or rearward pitching of the pelvic area so that more accurate evaluation may be conducted on an exercise apparatus to which the pelvic restraint is secured.