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This paper presents some practicalities and estab lished norms for isokinetic exercise. Reliability and validity of the isokinetic device were determined for measurements of torque, work, range of mo tion, and power. These parameters were evaluated for the conditions under which isokinetic exercise was employed to establish norms and to evaluate the effectiveness of that exercise in increasing mus cular strength. The norms are given for the quad riceps and hamstring muscle groups of normal young subjects. They pertain to force through the range of motion at varying speeds of contraction. The practicalities include objective comparison of effects of isokinetic exercise and two types of con ventional exercise. ISOKINETIC EXERCISE is a new dimension in the field of resistive exercise and muscle evalu ation. 1, 2 t is made possible by an electro mechanical device which keeps limb motion at a constant, predetermined velocity. Any effort applied encounters an equal counter-
Moffroid et al. (Tue,) studied this question.