Logan Steele
Muscle activation techniques (MAT) are used to improve mobility, alleviate pain, enhance athletic performance, and accelerate recovery from injury. MAT is a hands-on neuromuscular therapy that focuses on identifying and correcting muscle inhibition, which is the root cause of muscle tightness and pain. To test muscle activation, electromyography (EMG) is the standard technology for monitoring muscle activity. EMG assesses the electrical activity in muscles to diagnose conditions and evaluate muscle function. This can be done through surface EMG, which uses electrodes placed on the skin, or intramuscular EMG, which involves inserting needle electrodes directly into the muscle. Muscle strength testing is also an important component of the physical exam, which can help evaluate weakness and differentiate it from imbalance or poor endurance.
| Characteristics | Values |
|---|---|
| Muscle strength testing | Functional strength tests, Medical Research Council Manual Muscle Testing, hand-grip dynamometry |
| Muscle Activation Techniques (MAT) | Dynamic warm-ups, static stretching, foam rolling, isometric contractions |
| Diagnostic tests | Electromyography (EMG), Magnetic Resonance Imaging (MRI), Nerve Conduction Studies (NCS) |
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What You'll Learn
Muscle strength testing
The most commonly accepted method of evaluating muscle strength is the Oxford Scale (aka the Medical Research Council Manual Muscle Testing Scale). This method involves testing key muscles from the upper and lower extremities against the examiner's resistance and grading the patient's strength on a scale of 0 to 5. Commonly tested muscles include the shoulder abductors, elbow flexors, wrist extensors, finger flexors, and hip flexors. The MRC scale is preferred by many because it is convenient, safe, and requires minimal training. No equipment is needed; instead, the provider pushes parts of your body in specific directions while you push back against the pressure.
Another approach to muscle strength testing involves testing functional movements instead of quantifiable strength. Examples of functional tests include squatting or rising from a chair. Functional strength tests provide information about whether the patient is strong enough to perform essential daily activities. However, functional strength tests do not provide a grade or numeric quantity that can be tracked over time to gauge improvement.
More precise methods of measurement, such as hand-grip dynamometry, are less subjective and provide a quantifiable measurement that can be tracked over time. Dynamometry involves a handheld device called a dynamometer that measures how much tension is exerted during a muscle contraction without motion (called an isometric contraction) in relation to the length of that muscle. The test is performed by placing the body part in a position where it is not influenced by gravity. After the dynamometer is positioned against the muscle, the patient exerts pressure for several seconds. A reading in pounds or kilograms is then displayed.
Diagnostic tests that measure electrical activity within muscle fibres typically use electromyography (EMG). This involves placing electrodes on the skin or inserting them into the muscle. The recorded signals are analysed to assess the muscle's electrical activity during rest and contraction. Abnormal patterns can indicate muscle or nerve disorders.
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Environmental conditions
Altitude, for instance, affects the oxygen levels available, which can reduce the efficiency of energy production and muscle contractions. Higher altitudes have lower oxygen levels, which can impact muscle activation. Similarly, high humidity can lead to quicker overheating, affecting athletic performance. Athletes commonly train in varying conditions to adapt and optimise their performance under different environmental stresses.
Diagnostic tests that measure muscle activation offer valuable insights into muscle health and function. Electromyography (EMG) is a standard technology for monitoring muscle activity in laboratory environments, assessing the electrical activity of muscle fibres. EMG can be performed through Surface EMG (sEMG) or Intramuscular EMG. sEMG uses surface electrodes placed on the skin to provide a non-invasive overview of muscle activity, while Intramuscular EMG involves inserting needle electrodes directly into the muscle for more detailed information.
In addition to EMG, Mechanomyography (MMG) is an emerging alternative for monitoring muscle activity. MMG has shown promise in pervasive applications and can be combined with inertial measurement unit (IMU) data to segment muscle activity at specific points, such as entering, holding, and exiting a squat.
Furthermore, environmental conditions can also refer to the physical setting of the muscle activation test, such as dry land or aquatic environments. The choice of environment can influence the distribution of muscle activation during functional tasks, as seen in studies comparing muscle activation in young and older adults across different settings.
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Electromyography (EMG)
Surface EMG uses electrodes placed on the skin and provides a general overview of muscle activity. It is non-invasive and less painful but might not capture deeper muscle signals accurately. During the test, the electrodes placed on the skin pick up the electrical activity, which is then displayed on an oscilloscope (a monitor that displays electrical activity in the form of waves). An audio amplifier is used so the activity can be heard.
Intramuscular EMG, on the other hand, involves inserting needle electrodes directly into the muscle to provide detailed information about the electrical activity of specific muscle fibres. This method is often used for diagnosing neuromuscular disorders.
EMG can help diagnose conditions like muscular dystrophy, carpal tunnel syndrome, and amyotrophic lateral sclerosis (ALS). It can also be used to detect issues with motor nerves, muscles, or the communication between the two. Neurologists often perform EMG tests alongside nerve conduction studies (NCS) to measure the flow of electrical current through a nerve before it reaches a muscle. NCS can help determine nerve damage and destruction and is often performed simultaneously with EMG to detect the presence, location, and extent of diseases that damage nerves and muscles.
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Nerve Conduction Studies (NCS)
NCS is often performed for conditions that cause symptoms such as numbness, tingling, or weakness in the arms or legs, caused by pressure on nerve roots as the nerve becomes "pinched" or compressed. It works by testing the transmission of these signals, especially the speed and strength at which they travel. Electrical stimulation is used to measure the response of the nerves. With healthy nerves, electrical signals can travel at up to 120 miles per hour. If a nerve is damaged, the transmission will be slower and weaker. By stimulating the nerves at different places, an NCS can determine the specific site of the compromised nerve.
NCS is a non-invasive, outpatient exam that is performed by attaching two patch-like electrodes to the skin over the selected nerve. One electrode stimulates the nerve with a mild impulse, while the other records the electrical activity. The patient may experience a small tingling sensation, similar to their foot falling asleep. The stimulation and response are displayed on a monitor for the neurologist to interpret. There is no pain associated with an NCS, though some patients report a sensation like a static electricity shock that lasts a few seconds.
NCS is often used in conjunction with EMG to provide a detailed neuromuscular assessment. These tests help diagnose muscle and nerve disorders, plan treatments, and evaluate rehabilitation progress. A patient presenting with muscle weakness and numbness may undergo both an EMG and NCS to diagnose conditions like peripheral neuropathy or radiculopathy.
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Rehabilitation exercises
Muscle activation techniques (MAT) are an effective way to rehabilitate muscles and improve overall muscle function. MAT is a hands-on neuromuscular therapy that focuses on identifying and correcting muscle inhibition, the root cause of muscle tightness and pain. MAT can be used to treat anyone seeking to improve mobility, alleviate pain, recover from injury, or enhance athletic performance.
MAT works on the principle that a limitation in the range of motion indicates potential weakness in the muscles that move you into that position. MAT practitioners conduct an evaluation to identify muscles that are not functioning properly, creating muscle imbalances and compensation patterns that can result in pain over time.
MAT can address inhibited muscles and restore proper communication between the nervous system and muscular system, enhancing muscle contractile capabilities and restoring overall muscle function. This leads to improved stability and increased mobility, making it an effective tool for rehabilitation exercises.
Furthermore, electromyography (EMG) can be used as a diagnostic tool during rehabilitation. EMG assesses the electrical activity of muscles during rest and contraction, providing valuable information about their health and function. This technique can be combined with Magnetic Resonance Imaging (MRI) to offer a comprehensive view of muscle structure and function. Nerve Conduction Studies (NCS) can also be paired with EMG to assess the speed and strength of electrical signals between nerves and muscles, aiding in the diagnosis of muscle and nerve disorders and evaluating rehabilitation progress.
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Frequently asked questions
Muscle activation is a term used in fitness and therapy to describe exercises designed to warm up or "activate" muscles before physical activity.
Muscle activation can be tested through electromyography (EMG), which assesses the electrical activity in muscles to diagnose conditions and evaluate muscle function.
There are two types of EMG: Surface EMG and Intramuscular EMG. Surface EMG uses electrodes placed on the skin and provides a general overview of muscle activity. Intramuscular EMG involves inserting needle electrodes directly into the muscle to provide detailed information about specific muscle fibers.
EMG is a valuable tool for diagnosing muscle conditions and understanding muscle performance. It can help identify muscle or nerve disorders and provide insights into muscle health and function.
Yes, alternative methods include mechanomyography (MMG) and muscle strength testing. MMG is often used in squat-based tasks to induce muscle fatigue and measure muscle activity. Muscle strength testing can be done through functional movements such as squatting or rising from a chair to evaluate a patient's ability to perform daily activities.
