From a broad perspective a load can be applied to a contracting muscle in two ways: manually or mechanically.

Manual Resistance Exercise

Manual resistance exercise is a type of active-resistive exercise in which resistance is provided by a therapist or other health professional. A patient can be taught how to apply self-resistance to selected muscle groups. Although the amount of resistance cannot be measured quantitatively, this technique is useful in the early stages of an exercise program when the muscle to be strengthened is weak and can overcome only minimal to moderate resistance. It is also useful when the range of joint movements needs to be carefully controlled. The amount of resistance given is limited only by the strength of the therapist.

Mechanical Resistance Exercise

Mechanical resistance exercise is a form of active-resistive exercise in which resistance is applied through the use of equipment or mechanical apparatus. The amount of resistance can be measured quantitatively and incrementally progressed over time. It is also useful when the amount of resistance necessary is greater than what the therapist can apply manually.

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