M1TI Osteopathic Manipulative Medicine (OMM) Practice Test 2026 - Free OMM Practice Questions and Study Guide

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Isokinetic contraction is defined as what?

A concentric contraction against resistance in which the angular change of joint motion stays at the same velocity. The counterforce is less than the patient force.

Isokinetic contraction means the muscle shortens (or lengthens) against resistance while the joint moves at a constant angular velocity. This is achieved with a device that provides accommodating resistance, so the speed stays fixed throughout the range even as the amount of force the muscle generates changes. The key idea is the movement remains at the set rate, with the machine adjusting the counterforce to maintain that speed. This distinguishes it from a static hold (no movement) or a motion against a fixed resistance where speed would vary with effort.

A concentric contraction with increasing velocity regardless of resistance

A static contraction with no joint movement

A contraction where the counterforce exceeds the patient force