(EP910439-A1)      The machine comprises a frame, with a seat connected to the frame for supporting the user, being adjustable to several positions on the frame. There is a pedal mounted on the frame, which is movable in response to a force applied by the user. There is also a fluid loading device with a piston and housing to receive a compressible working fluid.    A loading device mount is connected to the fluid loading device and is adjustable to move parts of the fluid loading device so that the volume of the working space can be adjusted. A pressure source supplies compressible fluid to the working space at various baseline operating pressures, and a load connection linkage is connected between the pedals and fluid loading device.    USE -   For physical exercise, particularly combining exercise and performance monitoring with the ability to provide different force loadings and rates. For therapy and rehabilitation.    ADVANTAGE -   Overcomes the limitations of other devices in being able to provide for exercise at wide variety of loads, loading rates and velocities. Easily adjusted and can be used to collect and display data for assessing physical performance, limitations, injuries and to indicate muscular strength and general physical conditioning.    (US5890996-A)      The machine comprises a frame, with a seat connected to the frame for supporting the user, being adjustable to several positions on the frame. There is a pedal mounted on the frame, which is movable in response to a force applied by the user. There is also a fluid loading device with a piston and housing to receive a compressible working fluid.    A loading device mount is connected to the fluid loading device and is adjustable to move parts of the fluid loading device so that the volume of the working space can be adjusted. A pressure source supplies compressible fluid to the working space at various baseline operating pressures, and a load connection linkage is connected between the pedals and fluid loading device.    USE -   For physical exercise, particularly combining exercise and performance monitoring with the ability to provide different force loadings and rates. For therapy and rehabilitation.    ADVANTAGE -   Overcomes the limitations of other devices in being able to provide for exercise at wide variety of loads, loading rates and velocities. Easily adjusted and can be used to collect and display data for assessing physical performance, limitations, injuries and to indicate muscular strength and general physical conditioning.