Nautilus and Cybex are two types of isokinetic machines, where machine varies amount of resistance being lifted to match force curve developed by the muscle. (davedreas.com)
For example, Masuda et al. (2005) found that ball velocity during maximal kicking efforts by university soccer players was associated with hip adductor but not knee extensor torque production during isokinetic testing. (strengthandconditioningresearch.com)
The hamstrings and quadriceps strength was measured immediately after measurements of range of motion (ROM) and massage with Cybex - II isokinetic dynamometer equipped with an x-y pen recorder. (journals.lww.com)