Isokinetic Exercise
Pronunciation: eye-so-kih-NET-ik
A form of dynamic muscle exercise in which the speed of movement is held constant by a specialized dynamometer, allowing measurement of torque and muscle performance.
Full Definition
Isokinetic exercise is performed using devices such as the Cybex or Biodex dynamometer, which accommodate resistance to maintain a preset angular velocity throughout the range of motion. This modality is used in both therapeutic rehabilitation and objective assessment of muscular strength and endurance, particularly for the knee and shoulder. In PM&R and sports medicine documentation, isokinetic data are typically reported as peak torque values (in Newton-meters) at specified angular velocities (in degrees per second). Editors should distinguish this from 'isotonic' (constant load) and 'isometric' (no movement) exercise. The prefix 'iso-' means 'same' or 'equal,' and consistent hyphenation or non-hyphenation should follow the house style.
Usage
Usage note: Do not confuse with isotonic or isometric exercise. When reporting isokinetic data, always include angular velocity and the joint tested.
In Context
- "Isokinetic testing at 60°/s revealed a 35% quadriceps strength deficit on the operative limb." — Orthopaedic rehabilitation outcome report
- "The manuscript incorrectly described isokinetic exercise as 'constant-load training'; the editor corrected this to note it involves constant velocity." — Peer-reviewed sports medicine manuscript