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Muscle atrophy is the wasting or thinning of muscle mass, which can cause a loss of strength and mobility. It can be caused by a variety of factors, including lack of physical activity, nerve damage, malnutrition, genetics, and certain medical conditions. Diagnosing muscle atrophy typically involves a physical examination by a healthcare provider, who will assess symptoms such as reduced muscle mass, weakness, and numbness in the affected areas. Further tests, such as blood tests, muscle biopsies, and imaging scans, may also be ordered to confirm the diagnosis and identify the underlying cause.
| Characteristics | Values |
|---|---|
| Definition | Wasting or thinning of muscle mass or tissue |
| Cause | Lack of physical activity, malnutrition, age, genetics, nerve problems or diseases, underlying health conditions, injury, medical conditions |
| Symptoms | Muscles look smaller than normal, weakness in one arm and/or one leg, numbness or tingling in arms and legs, trouble walking or balancing, difficulty swallowing or speaking, muscle weakness, clumsiness, falling, breathing problems |
| Diagnosis | Physical exam, blood test, muscle or nerve biopsy, electromyography (EMG), nerve conduction studies, computed tomography (CT) scan, magnetic resonance imaging (MRI) scan, handgrip test |
| Treatment | Exercise, physical therapy, ultrasound therapy, surgery, functional electrical stimulation (FES), healthy diet |
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What You'll Learn
Physical examination
To diagnose muscle atrophy, a physical examination is required. This will involve a healthcare provider examining the patient's arms and legs and measuring their muscle mass. The physical examination will also involve taking the patient's medical history and asking about their symptoms.
During the physical examination, the healthcare provider will look for signs of muscle atrophy, such as a decrease in muscle mass and strength. They may also look for other signs, such as:
- One arm or leg being smaller than the other
- Weakness in one arm or leg
- Numbness or tingling in the arms and legs
- Trouble walking or balancing
- Difficulty swallowing or speaking
The physical examination may also involve simple tests to distinguish muscle atrophy from similar conditions. For example, a doctor may test for muscle weakness and hypotonia, which can be signs of spinal muscular atrophy (SMA). Other tests used to diagnose SMA include nerve conduction velocity tests and electromyograms (EMGs). EMGs measure the electrical activity in the muscles and require the insertion of short needles into the muscles.
In addition to the physical examination, a doctor may also recommend genetic testing or a muscle biopsy to diagnose muscle atrophy.
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Patient symptoms and history
When diagnosing muscle atrophy, a healthcare provider will give a physical exam and ask the patient about their symptoms. They will look at the patient's arms and legs and measure their muscle mass. They may also order tests such as a blood test, muscle or nerve biopsy, electromyography (EMG), nerve conduction studies, a computed tomography (CT) scan, or a magnetic resonance imaging (MRI) scan.
The symptoms of muscle atrophy differ depending on the cause of the condition. The most obvious sign is reduced muscle mass. Patients may notice that certain parts of their body look smaller or feel weaker. One arm or leg may be noticeably smaller than the other. The patient may experience weakness, numbness, or tingling in their arms and legs. They may also have trouble walking or balancing, and experience difficulty swallowing or speaking.
If the patient has muscle atrophy in their face or throat, their facial muscles may start feeling weak and they may find it difficult to speak or swallow. They may also experience pain in their muscles.
Muscle atrophy is often caused by a lack of physical activity or sedentary lifestyle, and can be treated with exercise and physical therapy. It can also be caused by malnutrition or malnourishment, aging, genetics, or certain medical conditions. Patients with a family history of muscular dystrophy are at a higher risk of developing the disease.
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Measuring muscle mass
Muscle atrophy is the wasting or thinning of muscle mass. It can be caused by the disuse of muscles, neurogenic conditions, malnutrition, age, genetics, or certain medical conditions. The diagnosis of muscle atrophy involves a physical examination, assessment of symptoms, and measurements of muscle mass.
Bioelectrical Impedance Analysis (BIA): This method uses a body composition analyser or a body fat scale that applies a slight electrical charge to the body. The current passes through the body differently depending on whether it meets fat, muscle, or bone. By measuring the resistance to the electrical current, the device can estimate body fat percentage. Then, by subtracting the body fat percentage from 100, you can determine the lean body mass percentage, which includes muscle mass along with bone and other components. BIA is relatively inexpensive and easily accessible but is sensitive to hydration levels and may not provide accurate results.
Circumference Measurements: This technique, recommended by the United States Navy, involves measuring the circumferences of various body parts, such as the waist, hips, neck, and abdomen. These measurements are then used to calculate a circumference value (CV) that corresponds to specific body fat percentage estimates. While this method is simple and does not require costly equipment, it does not directly account for muscle size and may not provide an accurate representation of muscle mass.
Magnetic Resonance Imaging (MRI): MRI is considered the most accurate method to measure muscle mass. It uses strong magnets to create detailed images of the muscles. The magnetic field temporarily rearranges the body's hydrogen atoms, allowing for precise analysis of muscle tissue. However, this method requires access to specialised medical equipment and may be more costly.
DEXA (Dual-Energy X-ray Absorptiometry): DEXA is another highly accurate method for measuring muscle mass and body composition. It involves low-dose radiation to scan the body and determine the amount of fat, muscle, and bone. DEXA can also measure visceral fat in the abdominal cavity and the density of bones. While DEXA provides valuable insights, it does come with a small amount of radiation exposure.
Bod Pod (Whole-Body Air Displacement Plethysmography): This technique measures muscle mass by assessing the amount of air displaced by an individual while they sit in a sealed chamber. Based on the volume of air displaced and the person's weight, a reasonably accurate estimate of lean body mass can be calculated.
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Diagnostic tests
To diagnose muscle atrophy, a healthcare provider will first perform a physical exam and ask about your symptoms. They will look at your arms and legs and measure your muscle mass to determine which nerves are affected.
- Blood test: This can help identify any underlying medical conditions, such as malnutrition or metabolic disorders, that may be contributing to muscle atrophy.
- Muscle or nerve biopsy: A small sample of the muscle or nerve tissue is removed and examined under a microscope to look for any signs of damage or disease.
- Electromyography (EMG): This test records the electrical activity of your muscles to evaluate nerve and muscle health. It can help diagnose neurogenic atrophy by detecting nerve damage or dysfunction.
- Nerve conduction studies: These studies assess the health of the nerves by measuring how well they transmit electrical signals. This can help identify any nerve-related issues that may be causing muscle atrophy.
- Imaging scans: Computed tomography (CT) scans and magnetic resonance imaging (MRI) scans can provide detailed images of the muscles and surrounding structures, helping to identify any abnormalities or damage. These scans are particularly useful in detecting muscle or nerve injuries and diseases.
It is important to note that the diagnostic process and specific tests ordered may vary depending on the suspected cause and severity of muscle atrophy, as well as the patient's medical history and symptoms.
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Treatment options
Neurogenic atrophy, caused by an injury or disease affecting nerves that connect to the muscles, typically cannot be reversed due to the physical damage that has been done to the nerves. However, a special kind of physical therapy called electrical stimulation may be used as a treatment.
Other treatment options for muscle atrophy include drug treatment, gene therapy, stem cell therapy, cytokine therapy, and surgery. Exercise therapy is widely acknowledged as the most effective treatment for skeletal muscle atrophy, but it may not be suitable for all patients, such as those who are bedridden or have fractured bones. Therefore, understanding the molecular mechanisms of skeletal muscle atrophy is crucial for developing new therapies.
Focused ultrasound is a non-invasive therapeutic technology that has shown potential in preclinical research for treating muscle atrophy. It works by generating non-thermal stimulation of angiogenesis on satellite cells, which has been found to diminish muscle atrophy compared to controls. However, more work is needed before this technique can be clinically applied.
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Frequently asked questions
Muscle atrophy is the wasting or thinning of muscle mass or tissue. It can be caused by disuse of muscles, neurogenic conditions, malnutrition, age, genetics, lack of physical activity, or certain medical conditions.
Symptoms of muscle atrophy include:
- One arm or leg is smaller than the other
- Weakness in one arm or leg
- Numbness or tingling in arms and legs
- Trouble walking or balancing
- Difficulty swallowing or speaking
If you experience any of these symptoms, consult your healthcare provider for a physical exam.
To diagnose muscle atrophy, a healthcare provider will perform a physical exam and ask about your symptoms. They will measure your muscle mass and may order additional tests, including blood tests, muscle or nerve biopsies, electromyography (EMG), nerve conduction studies, computed tomography (CT) scans, or magnetic resonance imaging (MRI) scans.
