Dominic Stone
Muscle atrophy is the thinning or wasting away of muscle tissue and loss of muscle mass. It can be caused by a variety of factors, including malnutrition, ageing, lack of physical activity, nerve damage, or certain medical conditions. There are three types of muscle atrophy: physiologic, pathologic, and neurogenic. Physiologic atrophy is caused by not using muscles enough, pathologic atrophy is associated with ageing, starvation, and diseases, and neurogenic atrophy is caused by nerve injuries or diseases. The symptoms of muscle atrophy include reduced muscle mass, weakness, and numbness or tingling in the limbs. Treatment options include exercise, nutritional therapy, and in some cases, surgery.
| Characteristics | Values |
|---|---|
| Definition | Wasting or thinning of muscle mass |
| Loss of muscle mass | 20 to 40% |
| Muscle appearance | Smaller than normal |
| Causes | Malnutrition, age, genetics, lack of physical activity, nerve problems, diseases, medications, etc. |
| Types | Physiologic, pathologic, neurogenic |
| Symptoms | Numbness, weakness, tingling in limbs, difficulty swallowing, difficulty speaking, difficulty breathing, etc. |
| Diagnosis | Physical exam, blood test, muscle or nerve biopsy, electromyography (EMG), nerve conduction studies, imaging scans, etc. |
| Treatment | Exercise, healthy diet, nutritional therapy, physical therapy, surgery, etc. |
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What You'll Learn
Muscle atrophy symptoms
Muscle atrophy is the thinning or loss of muscle tissue and mass. It can be caused by muscle disuse, nerve damage, ageing, malnutrition, genetics, or certain diseases. The symptoms of muscle atrophy vary depending on the cause and severity of muscle loss.
The most obvious symptom of muscle atrophy is reduced muscle mass. This may be difficult to detect due to obesity, changes in fat mass, or edema. One arm or leg may be noticeably smaller than the other. Other symptoms include weakness, numbness, and tingling in the limbs. Patients may also experience trouble walking or balancing, and difficulty swallowing or speaking.
The hallmark symptom of muscle atrophy is increased weakness, which may result in difficulty or inability in performing physical tasks depending on which muscles are affected. For example, atrophy of the core or leg muscles may cause difficulty standing from a seated position, walking, or climbing stairs, and can cause an increased number of falls. Atrophy of the throat muscles may cause difficulty swallowing, and diaphragm atrophy can cause difficulty breathing.
The rate of muscle atrophy due to disuse is approximately 0.5-0.6% of total muscle mass per day, though there is variation between individuals. The elderly are the most vulnerable to dramatic muscle loss with immobility. The time it takes to regain muscle after atrophy depends on the type of atrophy and the severity of the condition. Disuse atrophy is usually reversible, but it requires regular exercise and a healthy diet.
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Muscle atrophy causes
Muscle atrophy is the thinning or wasting of muscle mass. It can be caused by several factors, including disuse of muscles, neurogenic conditions, malnutrition, aging, and certain medical conditions. Here are some detailed explanations of the various causes of muscle atrophy:
Disuse or Physiologic Atrophy
Disuse atrophy, also known as physiologic atrophy, is one of the most common causes of muscle atrophy. It occurs when muscles are not used enough due to a sedentary lifestyle, health problems, or insufficient exercise. This type of atrophy is reversible through exercise and a healthy diet. The process typically begins within two to three weeks of muscle disuse, and the rate of atrophy is approximately 0.5–0.6% of total muscle mass loss per day.
Neurogenic Atrophy
Neurogenic atrophy is caused by injuries or diseases affecting the nerves that connect to the muscles. When these nerves are damaged, they cannot trigger the necessary muscle contractions, leading to a decrease in muscle size and strength. Neurogenic atrophy is often more sudden than physiologic atrophy and can be more challenging to reverse.
Aging
Age-related muscle atrophy, also known as sarcopenia, is a common occurrence. As people age, they may experience a loss of muscle mass and strength, with scientists attributing this not only to aging but also to a decrease in everyday activities that use muscle power. Sarcopenia can be slowed through regular exercise.
Malnutrition
Malnutrition can lead to muscle atrophy, especially in cases of prolonged starvation. This occurs when the body first loses fat and then begins to break down muscle tissue for energy. Malnutrition-related atrophy can often be reversed through nutritional therapy and dietary interventions.
Medical Conditions
Certain medical conditions can directly cause muscle atrophy or lead to immobility, resulting in muscle wasting. These conditions include amyotrophic lateral sclerosis (ALS), dermatomyositis, Guillain-Barré syndrome, multiple sclerosis, and various spinal muscular atrophies. Additionally, systemic diseases such as cancer, congestive heart failure, chronic obstructive pulmonary disease, and AIDS can cause a complex muscle-wasting syndrome called cachexia, which cannot be completely reversed through nutrition alone.
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Muscle atrophy types
Muscle atrophy refers to the wasting or thinning of muscle mass. It can be caused by muscle disuse or neurogenic conditions. There are three types of muscle atrophy: physiologic, pathologic, and neurogenic.
Physiologic atrophy, or disuse atrophy, occurs when muscles are not used enough. This can be due to a sedentary lifestyle, malnutrition, old age, or certain health conditions that limit movement. Disuse atrophy can often be reversed through exercise and improved nutrition.
Pathologic atrophy is associated with aging, starvation, and diseases such as Cushing's disease, cancer, severe infections, and the use of certain medications. It is caused by an imbalance between protein synthesis and protein degradation, often due to the disease itself or disease-associated appetite changes.
Neurogenic atrophy is the most severe type of muscle atrophy. It is caused by an injury or disease affecting the nerves that connect to the muscles. This type of atrophy can occur suddenly and may lead to involuntary muscle twitching or muscle spasticity. Neurogenic atrophy typically cannot be reversed due to the physical damage to the nerves, but it can be treated with a special type of physical therapy called electrical stimulation.
Muscle atrophy can also be classified according to the muscles affected, the age of onset, and its rate of progression. For example, muscular dystrophy is a group of inherited diseases that cause weakness and wasting away of muscle tissue. There are nine major types of muscular dystrophy, including motor neuron diseases, spinal muscular atrophy, and inflammatory myopathies.
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Muscle atrophy diagnosis
Muscle atrophy is the wasting or thinning of muscle mass. It can be caused by muscle disuse, neurogenic conditions, malnutrition, age, genetics, or certain medical conditions. Diagnosis of muscle atrophy typically involves a physical examination by a healthcare provider, who will evaluate symptoms, measure muscle mass, and may order additional tests.
During the physical exam, the healthcare provider will visually inspect the patient's arms and legs, comparing them to identify any differences in size or muscle mass. They may also perform a manual muscle test to assess muscle strength and function. The provider may ask the patient about their medical history, including any injuries, illnesses, or medications that could be contributing factors.
Depending on the suspected cause and severity of muscle atrophy, the healthcare provider may recommend further diagnostic tests. These can include blood tests, muscle or nerve biopsies, electromyography (EMG), nerve conduction studies, computed tomography (CT) scans, or magnetic resonance imaging (MRI) scans. These tests help in evaluating muscle and nerve health, identifying potential underlying conditions, and determining the extent of muscle atrophy.
In some cases, muscle atrophy can be challenging to diagnose, especially if it is asymptomatic or in the early stages. Advanced imaging studies, such as MRI scans, can quantify muscle loss, but they are not frequently used due to their cost and availability. However, with noticeable muscle wasting, a healthcare provider can often make a diagnosis through a physical examination and a detailed patient history.
If muscle atrophy is caused by another condition, additional testing may be necessary to establish the underlying cause. This could involve specific tests or referrals to specialists, depending on the suspected condition. For example, if nerve damage is suspected, electrodiagnostic testing or nerve conduction studies may be ordered to assess nerve function and identify the location and extent of nerve injury.
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Muscle atrophy treatment
Muscle atrophy is the wasting or thinning of muscle mass. It can be caused by muscle disuse, nerve damage, malnutrition, ageing, and certain diseases. The treatment for muscle atrophy depends on the type and cause of atrophy.
Physiologic or Disuse Atrophy Treatment
Physiologic atrophy, or disuse atrophy, is caused by not using muscles enough. This can be due to a sedentary lifestyle, malnutrition, injury, illness, or old age. This type of atrophy can often be reversed with exercise and better nutrition. A healthcare provider may recommend physical therapy or an exercise plan, such as swimming, to reduce muscle workload. Nutritional therapy may also be suggested.
Neurogenic Atrophy Treatment
Neurogenic atrophy is caused by nerve damage or disease. This type of atrophy typically cannot be reversed due to the physical damage to the nerves. However, it can sometimes be treated with a special kind of physical therapy called electrical stimulation. This involves placing electrodes on the skin to send small electrical impulses to the nerves and muscles.
Pathologic Atrophy Treatment
Pathologic atrophy is caused by ageing, starvation, and diseases such as Cushing's disease. Treatment for pathologic atrophy will depend on the underlying cause. In cases of starvation, nutritional therapy may help. For age-related atrophy, exercise can slow the progression.
Other Treatments
In addition to the treatments mentioned above, there are several other potential treatments for muscle atrophy that are under investigation. These include drug treatment, gene therapy, stem cell therapy, cytokine therapy, and nutritional support. Surgical procedures may also improve muscle function in people with neurological conditions, injuries, or malnutrition-related muscle atrophy.
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Frequently asked questions
Muscle atrophy is the wasting or thinning of muscle mass. It can be caused by muscle disuse, ageing, malnutrition, nerve damage, or certain diseases.
The hallmark sign of muscle atrophy is a loss of lean muscle mass. This may be difficult to detect due to obesity, changes in fat mass, or edema. Other symptoms include weakness, numbness, and tingling in the limbs, as well as difficulty with walking, balancing, swallowing, or speaking.
Treatment for muscle atrophy depends on the underlying cause and the degree of muscle loss. Physical therapy, exercise, and nutritional interventions are often recommended. In some cases, functional electrical stimulation (FES) or surgery may be considered.
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