When considering the use of any form of electrical stimulation, one needs to be sure that both the nerves and the muscles are indeed intact, in order to elicit a muscle contraction. This means that the injury or disease should not affect the muscle itself, or the nerve that supplies the impulses to that muscle (the peripheral nerve).
So your question is probably then “How can I use it on a paralyzed or weak muscle”. In certain diagnosis, it is the brain or spinal cord that is indeed injured, rather than the muscle or peripheral nerve. This then allows us to artificially “trigger”the normal nerve impulse on the limb, resulting in a muscle contraction.
This then means that a person with an injury or disease effecting the brain or spinal cord (also known as an upper motor neuron lesion) can benefit from Therapeutic or Functional Electrical Stimulation, while someone who has an injury to the muscle or peripheral nerve cannot (also known as a lower motor neuron lesion).
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