Wiktor Wise
Electrical stimulation is a technology with a wide range of applications in medicine and athletics. It involves applying electricity to the body to increase or decrease nervous system activity. There are many types of electrical stimulation, including Transcutaneous Electrical Nerve Stimulation (TENS), Neuromuscular Electrical Stimulation (NMES), Electrical Muscle Stimulation (EMS), Interferential Current (IFC) stimulation, and Russian stimulation. Each type of stimulation has unique characteristics and applications, such as pain relief, muscle rehabilitation, and athletic training. The various names and techniques can be confusing, but they all share fundamental similarities and rely on the same physiological processes. This technology has the potential to revolutionize how we enhance and restore the human body.
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What You'll Learn
Transcutaneous electrical nerve stimulation (TENS)
TENS is used to treat a wide range of acute (short-term) and chronic (long-term) conditions, including osteoarthritis, tendinitis, fibromyalgia, chronic pelvic pain, diabetes-related neuropathy, and peripheral artery disease (PAD). TENS is also used for conditions such as arthritis, headaches, and nerve injuries.
The first TENS device was developed in the 1970s by neurosurgeon Dr. C. Norman Shealy. TENS units are small, often battery-powered devices that can easily fit into a pocket. Electrodes are strategically placed on the skin and connected to the TENS unit via wires, allowing users to customize the pulse amplitude, frequency, width/duration, and current patterns.
It is important to note that despite its benefits, there are some contraindications to using TENS, such as pregnancy, epilepsy, and the presence of pacemakers. It is always advisable to consult with a healthcare professional before using a TENS unit to ensure it is safe and appropriate for your specific needs and conditions.
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Neuromuscular electrical stimulation (NMES)
NMES involves the use of a device that transmits an electrical impulse to activate muscle groups via electrodes. The current passes through the electrodes into the body, stimulating the motor nerves and causing a muscle contraction. The intensity and frequency of stimulation can vary based on the level of muscular function and response to treatment.
NMES can be used to improve muscle strength, endurance, and motor control in patients with neuromuscular disorders. It is also used to enhance the functional activity of neurologically impaired patients. For example, NMES can be used to help patients with spinal cord injuries regain function and independence by assisting with functional movements such as walking, grasping, and reaching.
NMES is often used in conjunction with other types of electrical stimulation, such as Functional Electrical Stimulation (FES), which is commonly used in physical therapy and rehabilitation settings. NMES and FES can be delivered through innovative devices such as the Neuro20 PRO System, which can assist in accomplishing rehabilitation goals and enhancing overall health and well-being.
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Electrical muscle stimulation (EMS)
EMS involves the application of an electrical current across the surface of the skin using adhesive or rubber electrodes positioned near the muscles to be stimulated. This electrical current travels into the tissues, causing a depolarisation of motor neurons, which then carry the signal to the target muscle through synaptic transmission to the motor end plates. The resulting muscle contraction can range from a small muscle twitch to a powerful contraction capable of producing a physiological movement at the joints.
The intensity and frequency of EMS stimulation can be adjusted to suit the patient's needs and goals. The three main parameters that can be manipulated by the clinician are frequency, amplitude, and pulse width. EMS is often used in conjunction with other types of electrical stimulation, such as Neuromuscular Electrical Stimulation (NMES), Functional Electrical Stimulation (FES), and Patterned Electrical Muscle Stimulation (PEMS).
EMS has been found to be particularly beneficial for individuals with neurological impairments, such as stroke, traumatic brain injury, or Parkinson's disease. It can assist with functional movements like walking, grasping, and reaching. EMS is also useful for athletic training, as it typically uses lower-frequency rectangular waveforms that are well-suited for this purpose.
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Interferential current (IFC) stimulation
IFC therapy is particularly effective for pain of musculoskeletal origin, as it can reach deeper tissues and reduce skin impedance. It can be used to treat circulatory and muscular disorders, joint stiffness, edema, and inflammation. IFC is also useful for patients with muscle sprains, joint problems, and pain relief. The high-frequency waveform reaches the skin deeply with a higher level of stimulation and less discomfort to the patient.
The two electrical currents used in IFC are known as carrier waves, as they do not directly stimulate muscles or nerves but are instead used to achieve a greater depth of penetration. The first current, known as the intrinsic or carrier frequency, is usually set at 4000 Hz, although 2000 Hz and 6000 Hz are also options. The second current has the same amplitude but a slightly higher frequency, which is set by the therapist and can vary from 4001 Hz to 4150 Hz. The frequency with which the amplitude of the current is modulated is called the Amplitude Modulated Frequency (AMF).
The stimulation can be applied using pad electrodes and sponge covers, which, when wet, provide a reasonable conductive part. Electroconductive gel is another effective alternative. The sponges should be thoroughly wet to ensure even current distribution. Self-adhesive pad electrodes are also available and can make the application of IFC easier.
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Functional electrical stimulation (FES)
FES devices can vary in shape and size, depending on the treatment location and desired outcome. A typical FES device consists of a control box, about the size of a pack of cards, with a battery and electrodes. The electrodes can be placed on the skin surface or implanted deeper into the muscle or surrounding area of the targeted nerve. The electrodes deliver electrical impulses that activate the targeted muscles or nerves, causing them to contract and move.
The intensity of FES stimulation can vary, ranging from low settings that may not be felt at all to higher settings that can cause a pins and needles sensation or a burning feeling. Healthcare providers will work with patients to determine the appropriate intensity and ensure comfort during treatment. FES is generally well-tolerated, and while the electric shock sensation can be unpleasant, it is not painful.
FES has been shown to be particularly effective in treating foot drop, a common symptom of multiple sclerosis (MS). By stimulating the nerve that lifts the front of the foot during gait, FES can improve walking ability and reduce the risk of falls. FES is also being investigated for its potential benefits in swallowing, hand and arm function, and breathing problems for pulmonary disease patients.
FES is a valuable tool in physical therapy and rehabilitation settings, helping individuals regain function, improve muscle strength, and enhance overall health and well-being. It is often used as a short-term therapy to restore voluntary function and prevent lifelong dependence on the device.
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Frequently asked questions
TENS is a type of electrical stimulation used to decrease acute and chronic pain. It works by interrupting pain signals travelling from injured tissues to the brain.
NMES uses low-frequency electrical currents to stimulate nerves and muscles. It can be used to prevent muscle atrophy and increase muscle strength in patients with conditions such as stroke, spinal cord injury, and multiple sclerosis.
EMS stimulates muscle contractions using electrical impulses to strengthen weak muscles, reduce swelling, improve blood flow, and promote recovery and healing. It is commonly used in athletic training.
IFC uses two medium frequencies to reduce pain, improve range of motion, or promote local healing. It is intended for symptomatic relief of acute, chronic, and post-traumatic or post-surgical pain.
