Umair Gaines
Wide pulse neuromuscular electrical stimulation (WP-NMES) is a form of electrical stimulation that uses wide pulse widths (1 ms) and high frequencies (100 Hz) to generate muscle contractions. This type of stimulation has been found to produce larger contractions in individuals with chronic hemiparetic stroke, likely due to increased reflexive recruitment of motoneurons and greater reflex excitability on the paretic side. WP-NMES has also been studied for its potential benefits in improving mobility in older adults, reducing muscle atrophy in immobilized patients, and promoting central activation in individuals with spinal cord injuries. The intensity of stimulation can be adjusted to suit the patient's tolerance, and the placement of electrodes is important to avoid discomfort during treatment.
| Characteristics | Values |
|---|---|
| Definition | Neuromuscular and Muscular Electrical Stimulation (NMES) is a modality that sends electrical impulses to nerves, causing muscles to contract by mimicking the action potential coming from the central nervous system. |
| Application | NMES may be applied during functional movement or without functional movement. |
| Use Cases | NMES has been used for strengthening and maintaining muscle strength, improving mobility in older adults, and preventing atrophy, especially in immobilized patients. |
| Pulse Width | Wide pulse width NMES refers to a pulse width of 1 ms. |
| Frequency | Wide pulse NMES is associated with high frequencies, typically 100 Hz. |
| Torque | Wide pulse NMES generates larger contractions and more torque in the paretic limb compared to the non-paretic limb in individuals with chronic hemiparetic stroke. |
| Reflexive Recruitment | Wide pulse NMES augments contractions through increased reflexive recruitment of motoneurons, especially in individuals with spinal cord injuries. |
| Contraction Amplitude | Wide pulse NMES results in larger contraction amplitudes, with a 412% increase in torque in the triceps surae after 100 Hz stimulation. |
| Electrode Placement | Electrodes should be placed away from joints and properly attached to avoid pain and discomfort. |
| Pulse Duration | Pulse duration should be increased gradually to the maximum tolerable extent by the patient. For small muscles, the pulse duration is typically 150-200 microseconds, while for large muscles, it is 200-300 microseconds. |
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What You'll Learn
- Wide pulse neuromuscular electrical stimulation (NMES) can improve mobility in older adults
- NMES can be used to strengthen and maintain muscle strength
- NMES can be used to treat individuals with chronic hemiparetic stroke
- NMES can be used to treat individuals with spinal cord injuries
- NMES can be used to treat head and neck cancer survivors
Wide pulse neuromuscular electrical stimulation (NMES) can improve mobility in older adults
Wide pulse neuromuscular electrical stimulation (NMES) is a modality that sends electrical impulses to nerves, causing muscles to contract by mimicking the action potential coming from the central nervous system. It can be applied with or without functional movement. NMES has been used to strengthen and maintain muscle strength and prevent atrophy, especially in immobilized patients.
NMES can improve mobility in older adults, and its time course varies across tasks. It has been shown to generate larger contractions in the paretic limb compared to the non-paretic limb in individuals with chronic hemiparetic stroke. This is due to the increased reflex excitability on the paretic side, which results in increased reflexive recruitment of motoneurons. The larger contractions evoked by NMES in the paretic limb may lead to the development of more effective stroke rehabilitation paradigms and functional neural prostheses.
The size of the evoked contraction during NMES is often limited by the individual's discomfort, as discomfort increases with increasing stimulation currents. For individuals who have experienced a stroke, relatively high currents are sometimes required to generate muscle contractions sufficient to produce functional movements, especially when considering the need to overcome co-contraction and abnormal joint torque couplings. Therefore, there is a need to develop NMES techniques that generate large muscle contractions while minimizing discomfort and muscular fatigue.
NMES that incorporates higher frequencies (up to 100 Hz) and wider pulse widths (1 ms) (wide pulse NMES; WP-NMES) than those traditionally used for electrical stimulation produces more torque than expected from motor axon activation (extra contractions). Surface stimulation (1-ms pulses; 20 Hz for 2 s, 100 Hz for 2 s, 20 Hz for 3 s) was delivered to triceps surae and wrist flexors (muscle stimulation) and to median and tibial nerves (nerve stimulation) at two intensities. Contractions were evaluated for amplitude, consistency, and stability.
The effects of wide pulse NMES on elbow flexion torque have been studied in individuals with chronic hemiparetic stroke. Four stimulation patterns were delivered to explore the effects of pulse width and frequency on contraction amplitude: 20-100-20 Hz (4 s each phase, 1 ms pulse width); 20-100-20 Hz (4 s each phase, 0.1 ms); 20 Hz for 12 s (1 ms); and 100 Hz for 12 s (1 ms). When 0.1 ms pulses were used, there was no difference in torque between arms, but with 1 ms pulses, more torque was evoked in the paretic arm than the non-paretic arm.
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NMES can be used to strengthen and maintain muscle strength
Neuromuscular Electrical Stimulation (NMES) is a modality that sends electrical impulses to nerves, causing muscles to contract by mimicking the action potential coming from the central nervous system. This can be applied with or without functional movement.
NMES can be used to improve muscle strength and prevent atrophy, as well as maintain the range of motion around a joint. It is a useful treatment for those with spinal cord injuries, helping to counteract the negative adaptations that occur after such an injury. It can also be used to improve mobility in older adults, although the time course varies across different tasks.
The intensity of the stimulation should be increased gradually to the maximum tolerable level for the patient. The pulse duration and amplitude will depend on the type of muscle being stimulated. For innervated muscles, shorter pulse durations and greater pulse amplitudes are used, whereas denervated muscles require longer pulse durations and amplitudes.
NMES has been shown to generate larger contractions in the paretic limb compared to the non-paretic limb in individuals with chronic hemiparetic stroke. This is due to increased reflex excitability on the paretic side, which results in greater reflexive recruitment of motoneurons.
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NMES can be used to treat individuals with chronic hemiparetic stroke
Neuromuscular Electrical Stimulation (NMES) is a modality that sends electrical impulses to nerves, causing muscles to contract by mimicking the action potential coming from the central nervous system. NMES can be applied with or without functional movement and has been used over the years for strengthening and maintaining muscle strength, as well as preventing atrophy, especially in immobilized patients.
A study on the effects of wide pulse NMES on elbow flexion torque in individuals with chronic hemiparetic stroke found that NMES generated larger contractions in the paretic arm compared to the non-paretic arm. This was hypothesized to be due to increased reflex excitability for paretic muscles after a stroke. The study used four stimulation patterns to explore the effects of pulse width and frequency on contraction amplitude.
NMES can be used as a motor relearning tool, enabling stroke survivors with significant paresis to participate in goal-oriented repetitive movement therapy. The NMES-mediated task must be repetitive, novel, volitionally controlled, and functionally relevant. The primary intent of the NMES motor relearning system is training, with the goal of maintaining improved functional use of the hemiparetic limb even when the system is not in use. For patients in the chronic phase of a stroke, where motor relearning strategies have been exhausted, NMES may be used as a neuroprosthesis.
To prepare for NMES, the patient should be seated comfortably to allow for muscle relaxation, which is necessary for easier stimulation. The skin should be inspected for any injuries and cleaned with a cloth and water or alcohol-based wipes before being properly dried. Electrodes should then be placed away from the joints and properly attached to avoid pain and discomfort. During NMES, it is important to gradually increase the stimulation intensity to the maximum tolerable extent by the patient.
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NMES can be used to treat individuals with spinal cord injuries
Neuromuscular Electrical Stimulation (NMES) is a modality that sends electrical impulses to nerves, causing muscles to contract by mimicking the action potential coming from the central nervous system. NMES has been used over the years for strengthening and maintaining muscle strength, improving mobility in older adults, and preventing atrophy, especially in immobilized patients.
One study found a between-group difference in favor of NMES associated with progressive resistance training, and another study showed an increase in the number of muscles improved by at least one degree of strength after NMES in combination with a cycle ergometer. These findings suggest that NMES may be effective in improving muscle strength in individuals with SCI, but more high-quality randomized controlled trials are needed to confirm these results.
NMES can also be used in combination with other treatments for SCI. For example, transcutaneous electrical neural stimulation (TENS) is a surface-applied neuromodulation system used to treat chronic pain and manage spasticity through neuroplasticity or modulation of inhibitory circuits. TENS has been shown to enhance vibratory inhibition of the H reflex, which is beneficial for SCI patients as it is often suppressed in these individuals. Additionally, sacral nerve stimulation (SNS) has been established as a treatment for urinary retention, frequency, and incontinence, which are issues that can arise due to SCI. SNS restores normal bladder function by facilitating storage and voiding and suppressing reflex bladder activity through adaptive neuronal plasticity.
In conclusion, while NMES has been used to treat individuals with spinal cord injuries, the effectiveness of this treatment is still under investigation. There is some evidence that NMES can increase voluntary muscle strength in individuals with SCI, but more research is needed to compare its effectiveness to other treatments. NMES may be most effective when combined with other therapies or treatments, such as TENS or SNS, which can provide additional benefits for individuals with SCI.
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NMES can be used to treat head and neck cancer survivors
Neuromuscular Electrical Stimulation (NMES) is a modality that sends electrical impulses to nerves, causing muscles to contract by mimicking the action potential coming from the central nervous system. NMES can be applied with or without functional movement and has been used to strengthen and maintain muscle strength, prevent atrophy, and improve mobility in older adults.
NMES can be particularly useful for head and neck cancer survivors as it can help reduce trapezius muscle dysfunction. Before beginning NMES, the patient should be seated comfortably to allow for muscle relaxation, and the skin should be inspected and cleaned to ensure there are no abrasions or injuries. Electrodes are then placed away from the joints and attached to the skin to deliver the electrical impulses.
During NMES, the intensity of the stimulation should be increased gradually to the maximum extent tolerable by the patient. The pulse duration and amplitude will depend on whether the muscles are innervated or denervated. For innervated muscles, shorter pulse durations with greater amplitudes are used, while denervated muscles require longer and greater pulse durations and amplitudes.
Wide pulse-width, high-frequency NMES has been shown to augment contractions through increased reflexive recruitment of motoneurons in individuals with spinal cord injuries and those without neurological impairments. This type of NMES has the potential to generate larger contractions in the paretic limb compared to the non-paretic limb, which can aid in stroke rehabilitation. By eliciting larger contractions, wide pulse NMES can help develop more effective rehabilitation paradigms and functional neural prostheses.
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Frequently asked questions
Wide pulse neuromuscular electrical stimulation (WP-NMES) is a treatment that uses electrical impulses to cause muscles to contract. The treatment involves wide pulse widths (1 ms) and high frequencies (100 Hz).
The electrical impulses are sent to nerves, mimicking the action potential coming from the central nervous system. This causes muscles to contract, improving mobility and muscle strength.
WP-NMES is suitable for individuals with spinal cord injuries or chronic hemiparetic stroke. It can also be used to prevent muscle atrophy in immobilized patients.
The patient should be seated comfortably to allow for muscle relaxation. The skin is then cleaned and dried before electrodes are attached. The intensity of stimulation is increased gradually to the maximum tolerable extent.
WP-NMES can improve muscle strength and mobility, particularly in the paretic limb of individuals with chronic hemiparetic stroke. It may also aid in the development of more effective stroke rehabilitation methods.
