As muscles contract, microvolt level electrical signals are created
within the muscle
that may be measured from the surface of the body. A
procedure that measures
muscle activity from the skin is referred to as
surface electromyography (SEMG).
Researchers and clinicians use SEMG to
evaluate the functional status of
skeletal muscles and assist in
neuromuscular training and rehabilitation.
The small electrical current, or signal, which comes from active muscles, is
detected by sensors placed on the skin directly above the muscles. The strength
and pattern of the signal is displayed onto a computer screen and the data is
collected in a software program that is able to run various analysis of the data
to create useful reports regarding muscle function