Molly Ayala
Functional electrical stimulation (FES) is a treatment that applies low levels of electrical current to stimulate nerves and muscles, inducing or modifying nerve activation or muscle contraction to restore function. The electric shock sensation produced by this treatment can cause discomfort but not pain. The feeling of FES varies depending on the intensity of the stimulation, ranging from a tingling sensation at very low settings to a pins and needles feeling or burning sensation at higher settings. While FES can increase a person's independence and confidence after an injury, the sensation may prevent some individuals from continuing treatment.
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What You'll Learn
- Sensation: from tingling to pins and needles, and sometimes a burning sensation
- Independence: FES can increase independence and confidence after an injury
- Risks: discomfort, skin irritation, strained muscles, and infection
- Treatment: FES is used to treat foot drop, bladder voiding, and standing
- Function: FES can restore voluntary function and improve health
Sensation: from tingling to pins and needles, and sometimes a burning sensation
Functional electrical stimulation (FES) is a treatment that uses electrical impulses to stimulate nerves and muscles, causing them to contract and move. The intensity of the stimulation can vary, and this can affect the sensation that the treatment produces. At very low settings, FES may not be felt at all. At higher settings, it can produce a range of sensations, from a mild tingling sensation to a pins-and-needles feeling and, occasionally, a burning sensation. The maximum tolerable intensity is the highest level that a person can endure without experiencing discomfort.
The sensation of FES can be unpleasant for some people, and it can take time to get used to it. The treatment can cause discomfort, but it does not produce pain. The feeling of FES may be a barrier for some patients, preventing them from continuing with the treatment. However, the intensity of the stimulation can be adjusted to suit the patient's comfort level.
FES is a valuable treatment for individuals who have suffered paralysis or muscle weakness due to damage to the brain or spinal cord. By stimulating nerves and muscles, FES helps restore muscle function and movement. This can include generating functions such as grasping, standing, and walking. FES is particularly useful for individuals with foot drop, a condition where the front of the foot cannot be lifted to the correct angle during walking due to disruptions in nerve pathways.
The technology has evolved since its initial development in the 1960s, and it is now a significant therapeutic intervention. FES has the potential to increase independence and confidence in patients, reducing the risk of future injuries such as falls. It is also being investigated for potential use in improving swallowing, hand and arm function, and breathing problems for pulmonary disease patients and stroke patients.
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Independence: FES can increase independence and confidence after an injury
Functional electrical stimulation (FES) is a treatment that applies electrical charges to muscles that have become paralysed or weakened due to nerve damage. This stimulation wakes up the nerves and prompts the muscles to contract and move. FES can be used to generate muscle movement in limbs that are otherwise paralysed, allowing individuals to perform functions such as grasping, standing, and walking.
FES can increase a person's independence and confidence after an injury. It can help individuals with mobility impairments to participate in daily life, which would otherwise be difficult or impossible. For example, FES can be used to assist with standing while transferring from a wheelchair to a car, climbing steps, or reaching for an object. FES can also reduce the risk of future injuries, such as falls.
The intensity of FES can vary, and it may take some time for individuals to adjust to the sensations. At very low settings, FES may not be felt at all, or it may produce a tingling sensation. Higher settings can cause a pins and needles feeling, and sometimes a burning sensation. The maximum tolerable intensity is the highest level a person can endure without discomfort. It is important to note that FES is not suitable for everyone, and some individuals may find the sensations unpleasant and choose to discontinue treatment.
FES devices can be current or voltage-regulated. Current-regulated FES systems deliver a consistent charge to the tissue, while voltage-regulated devices may require more frequent adjustments to the stimulation intensity due to changes in skin/tissue resistance. The pulse duration, amplitude, and frequency are key parameters that can be regulated to control the complexity and sophistication of FES-induced functions.
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Risks: discomfort, skin irritation, strained muscles, and infection
Functional electrical stimulation (FES) is a treatment that sends electrical impulses to your muscles and nerves, causing them to contract and move. While FES is beneficial for many people, it does come with some risks, including discomfort, skin irritation, strained muscles, and infection.
Discomfort is a common risk associated with FES. The treatment can produce an electric shock sensation that may cause discomfort but not pain. The intensity of the stimulation can vary, ranging from a mild tingling sensation to a stronger pins-and-needles feeling or even a burning sensation at higher settings. However, it is important to note that healthcare providers carefully monitor the level setting to ensure that it is not too intense and that the patient is comfortable.
Skin irritation is another potential risk of FES. The electrodes used in FES must remain in contact with the skin for an extended period, which can irritate the skin and increase its vulnerability to external irritants. Additionally, the electrical stimulation itself can escalate skin reactions to low concentrations of irritant substances, such as sodium lauryl sulfate (SLS), in the area between the electrodes.
Strained muscles are also a possible risk of FES. While FES is often used to strengthen muscles and improve muscle function, if not properly managed, it can lead to muscle strain or worsening spasticity. It is important to work with a rehabilitation therapist to determine the proper type and placement of electrodes and to ensure the treatment is tailored to the patient's needs.
Infection is a risk primarily associated with implanted FES systems. The site of electrode placement can become irritated or infected, and there is also a risk of scar tissue forming around the electrode, known as encapsulation. Implanted FES systems may contain metal components that can interfere with magnetic resonance imaging (MRI), so it is important for patients to discuss this with their healthcare providers.
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Treatment: FES is used to treat foot drop, bladder voiding, and standing
Functional electrical stimulation (FES) is a treatment option for foot drop, bladder voiding, and standing. FES delivers small electrical pulses to weak or paralysed muscles, stimulating them to contract and move body parts in useful ways. The treatment can be used to help with standing and walking, and it can also improve balance and weight shifting.
FES can be an effective treatment for foot drop, a condition where the front of the foot cannot lift to the correct angle when walking due to disruptions in nerve pathways between the legs and brain. FES stimulates the nerves in the legs, helping to produce a more normal walking pattern. An initial assessment is required to determine if an individual is suitable for treatment and responsive to FES stimulation. If the patient is a good candidate, a health professional will set up the device and teach them how to use it. The patient may experience soreness in their legs, hips, or torso as they adjust to using different muscles for walking.
FES can also be used to treat bladder voiding issues, such as in patients with a complete spinal cord lesion. It does this through sacral anterior root stimulation, which has been used in at least 88 patients with generally good results. However, direct electrical stimulation of the bladder wall has been met with limited success due to pain and cocontraction of bladder outlet mechanisms.
In addition to treating foot drop and bladder voiding, FES can assist with standing. FES devices can be worn on the body to produce movement, with electrodes placed on the skin over the leg or trunk muscles. These devices help with weight shifting, balancing, transferring, and walking. The electrical stimulation coordinates hip, leg, and trunk movements.
The feeling of FES is described as a tingling sensation at very low settings and like pins and needles or a burning sensation at higher settings. While it does not cause pain, the electric shock sensation can be uncomfortable for some people, potentially preventing them from continuing treatment.
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Function: FES can restore voluntary function and improve health
Functional electrical stimulation (FES) is a treatment that applies small electrical charges to muscles that have become paralysed or weakened due to damage to the brain or spinal cord. FES can restore voluntary function and improve health in several ways.
Firstly, FES can help individuals with paralysis or weakness to restore muscle function and movement. By sending electrical impulses to the nerves and muscles, FES wakes up the nerves and causes the muscles to contract and tighten. This helps individuals to perform tasks such as grasping, holding, standing, and walking. FES can also be used to generate functions such as bladder voiding, reaching, and improving gait pattern.
Secondly, FES can increase a person's independence and confidence, especially after an injury or diagnosis. It can assist with daily activities such as standing, transferring from a wheelchair to a car, climbing steps, or reaching for objects. FES can also reduce the risk of future injuries, such as falls.
Thirdly, FES has been shown to be effective in neurorehabilitation, particularly for individuals who have had a stroke or spinal cord injury. It can help retrain voluntary motor functions and improve overall motor function. FES is also used in conjunction with other treatments, such as robotics, to improve arm movement for people with multiple sclerosis.
Lastly, FES can be used as a short-term therapy to restore voluntary function without creating long-term dependence on the device. The intensity of the electrical stimulation can be adjusted to suit the patient's needs and comfort level. FES devices can be current or voltage-regulated, allowing for customization of the treatment.
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Frequently asked questions
FES sends electrical impulses to your muscles and nerves, which can feel like a tingling sensation at low settings. At higher settings, it can cause a pins and needles feeling or a burning sensation. It is not painful, but it can be uncomfortable.
FES uses low-energy electrical pulses to generate body movements in individuals who have been paralysed due to injury to the central nervous system. It stimulates nerves and muscles to contract and helps restore muscle function and movement.
The risks of using an external functional stimulation device include discomfort, skin irritation at the site of the electrodes, worsening spasticity, and strained muscles. The feeling of FES may prevent some people from continuing treatment.
