Category: Advanced

  • Bio-Mechanics

    Isokinetics machines are measurement devices. They provide us with information about the moving mechanical performance of muscle groups. They assume (very incorrectly) that the muscles they are testing move at a constant angular velocity (or in other words that the muscle move isokinetically). Unfortunately, most biological joints do not possess a fixed axis of rotation…

  • Pre-Set Angular Velocity (PAV)

    When we set a speed for the Isokinetic ROM we presume this is the speed the machine will force the lever arm to turn at (or in other words the speed at which the exercise/test will take place at). In reality this is almost true but if we want to be really technically correct then…

  • Acceleration-Deceleration

    Whenever a movement is performed isokinetically we set a pre determined speed for the actuator to turn around (we presume the joint turns at a speed relative to this). However when the subject is waiting to begin the movement the machine is obviously not moving. So if we set an exercise to be performed at…

  • Moment Artifacts

    Acceleration and deceleration affect the isokinetic range of motion significantly¬†(see here for a full description). It has been shown that including the acceleration and deceleration portions of the range of motion during a test can seriously affect the results once the speed is increased (Taylor et al. 1991).When any test begins (isokinetic concentric or eccentric)…