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OMNISTIM ® 500 PRO USER MANUAL - 29 -
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Medium Frequency Alternating Current (MFAC)
1. Muscle Stimulation
Since the mid 18th Century, neuromuscular electrical stimulation (NMES) has been used as an adjunctive therapy
for various neuromuscular and musculoskeletal disorders. Clinicians and investigators have been successfully using
NMES to facilitate muscle contraction, to re-educate muscle action, to aid in the prevention of atrophy and to
overcome neuromuscular inhibition following injury or surgery.
a. Isometric Muscle Stimulation
NMES during isometric exercise offers a reduced threat of over-
stress and re-injury to the joint. NMES is clinically used at the
midpoint of the range of motion where the muscle can generate
maximum torque.
Procedure:
Gradually increase intensity to maximum patient tolerance during each contraction. The intensity should be
increased to produce at least 50 to 80% of Maximum Voluntary Contraction (MVC). Place ACP Reusable
Electrodes in a bipolar or quadripolar pattern on the muscle(s) being stimulated. The treatment should be
approximately 15 minutes duration 3 to 4 times a week.
b. Muscle Spasm Reduction
NMES can be utilized to induce fatigue of muscles in spasm.
Researchers have found that the greatest fatigue of muscles occurs
when the muscle contraction relaxation times are equivalent (1:1
ratio) and when higher frequencies (60-80 Hz) are used. Electrical
stimulation of the motor neuron using medium frequency currents
results in neuromuscular junction fatigue.
Procedure:
Gradually increase intensity to maximum patient tolerance during each contraction. Place electrodes in a
monopolar, bipolar or quadripolar pattern on the muscles in spasm. The treatment time should be of
approximately 20 minutes duration repeated 2 or 3 times per week.
c. Increased Blood Flow / Edema Reduction
Long and short-term electrical stimulation of muscle has been shown
to alter the vascular dynamics affecting local muscle blood and
lymph flow. It has been shown that blood-flow increased
significantly during the first minute of electrical stimulation and
remained elevated during and for ten minutes following stimulation.
The immediacy of vasodilatation following electrical stimulation
indicates that the vascular response is a functional, reflexive
response. In addition, long-term electrical stimulation has been
shown to increase the number of capillaries and thus improve the
capillary blood-flow to the stimulated muscle. Not all types and
parameters of electrical stimulation affect the blood-flow dynamics
of the muscle being stimulated. Therefore, the following clinical
parameters should be adhered to for optimal effectiveness.
Procedure:
Place one or two sets of electrodes in a bipolar or quadripolar
technique over the selected muscle(s). Gradually increase intensity
to 15 to 30% of maximum voluntary contractions. Continue the
treatment for approximately 10 minutes.
Mode NMES
Time ON
10 Sec
Time OFF 50 Sec
ON Ramp 2 Sec
OFF Ramp 2 Sec
Pulse Rate
35-50Hz
Mode NMES
Time ON 10 Sec
Time OFF 10 Sec
ON Ramp 1-2 Sec
OFF Ramp 1-2 Sec
Pulse Rate
35-50Hz
Blood Flow
Mode
NMES
Simultaneous
Time ON 15 Sec
Time OFF 50 Sec
ON Ramp 2 Sec
OFF Ramp 2 Sec
Pulse Rate 50Hz
Muscle Pump
Edema Reduction
Mode
NMES
Alternate
Time ON 4 Sec
Time OFF 4 Sec
ON Ramp 2 Sec
OFF Ramp 2 Sec
Pulse Rate 35Hz