Abstract: Methods of use of a portable in-bed exercising machine are provided for strengthening and/or strength maintenance of the musculature and ligaments associated with an extremity. The exercise apparatus employs the principles of closed kinetic chain exercise of the extremity in both concentric and eccentric modes and for isometric, isotonic and isokinetic exercise. Each extremity is engaged separately allowing for bilateral, unilateral and reciprocal motion. As exemplified for lower extremities, force is actively applied to the feet with each lower extremity having the force level continuously adjustable from zero force to a force equal to or greater than body-weight The exercise motions and force applications use the same major muscle groups as functional activities such as standing from a chair, climbing stairs walling, jumping and jogging. Vertical support is provided for the lower extremity to stabilize and control the lower extremity motion within safe limits.

Abstract: A portable in-bed exercising machine is provided for strengthening and/or strength maintenance of the musculature and ligaments associated with an extremity. The exercise apparatus employs the principles of closed kinetic chain exercise of the extremity in both concentric and eccentric modes and for isometric, isotonic and isokinetic exercise. Each extremity is engaged separately allowing for bilateral, unilateral and reciprocal motion. As exemplified for lower extremities, force is actively applied to the feet with each lower extremity having the force level continuously adjustable from zero force to a force equal to or greater than body-weight. The exercise motions and force applications use the same major muscle groups as functional activities such as standing from a chair, climbing stairs, walking, jumping and jogging. Vertical support is provided for the lower extremity to stabilize and control the lower extremity motion within safe limits.