Traditionally, they were categorised depending on their varying color.

Red Fibers:

Those containing high levels of myoglobin and oxygen storing proteins had a red appearance. Red muscle fibers tend to have more mitochondria and blood vessels than the white ones.

White Fibers:

Those with a low content had a white appearance. 

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In most modern systems based on either a resistance pad and a load sensor (where the position of the lever arm is adjustable like the Kin-Com AP) or where torque is derived from turning force at the actuator axis (like in the Cybex / CSMI Norm, Biodex system 4 pro, Isocom, BTE, Contrex and Isomed), the following is true:-

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Please note this is not an extensive list only a guide.

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The order of joint forces describes the amount of force placed through the musculo-skeletal system during a type of exercise or test.

The higher the force the more likely the exercise will be painful and the higher the likelihood of injury during it.

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Order Of Strength

The order of strength describes how much torque (strength) we can produce in the various exercises or tests if the test is the same.

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Modern isokinetics machines use several components to create isokinetic resistance.

Apart from the base of the machine and chair/bed to perform tests/exercises from the main component of the modern isokinetic machine is the dynamometer.

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