Logan Steele
Muscle atrophy is the thinning or loss of muscle tissue and mass. It can be caused by muscle disuse, neurogenic conditions, malnutrition, age, genetics, or medical conditions. As people age, their bodies produce fewer proteins that promote muscle growth, leading to muscle loss. This natural ageing process is known as sarcopenia and is characterized by a decrease in muscle mass, strength, and function. Certain diseases and conditions, such as muscular dystrophy, arthritis, and multiple sclerosis, can also contribute to muscle atrophy. Treatments for muscle atrophy include physical therapy, lifestyle changes, and in some cases, surgery.
| Characteristics | Values |
|---|---|
| Muscle loss name | Muscle atrophy, sarcopenia |
| Cause | Disuse of muscles, neurogenic conditions, malnutrition, age, genetics, lack of physical activity, certain medical conditions |
| Symptoms | Loss of movement, weakness, loss of endurance, reduced muscle mass, muscle shrinkage, tingling, numbness, difficulty swallowing, poor balance, falls, trouble climbing stairs |
| Treatment | Exercise, physical therapy, surgery, healthy diet, progressive resistance-based strength training |
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Muscle atrophy
Neurogenic atrophy is caused by nerve problems or diseases that affect the nerves connected to the muscles. When these nerves are damaged, they cannot trigger the muscle contractions necessary for muscle activity. As a result, the muscles atrophy and waste away. Neurogenic atrophy can be caused by conditions such as amyotrophic lateral sclerosis (ALS), multiple sclerosis (MS), carpal tunnel syndrome, spinal cord injuries, and Guillain-Barre syndrome.
Pathologic atrophy is associated with aging, starvation, and diseases such as Cushing disease, which can be caused by the overuse of corticosteroids. As people age, their bodies produce fewer proteins necessary for muscle growth, leading to muscle atrophy. This process can be accelerated by changes in hormones, such as testosterone and insulin-like growth factor (IGF-1), which affect muscle fibres. Additionally, certain diseases and chronic conditions can contribute to muscle atrophy, including arthritis, myositis, and muscular dystrophy.
The symptoms of muscle atrophy include a decrease in muscle mass, with one arm or leg sometimes appearing smaller than the other. Individuals may experience tingling, numbness, or weakness in their limbs, and in severe cases, facial muscles may weaken, causing difficulty in speaking or swallowing. Treatment for muscle atrophy depends on the underlying cause and may involve physical therapy, ultrasound therapy, or surgery. Exercise programs, especially progressive resistance-based strength training, can help improve muscle strength and reverse muscle loss. Maintaining a healthy diet, rich in proteins, is also crucial for counteracting muscle atrophy.
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Sarcopenia
The rate of muscle loss in sarcopenia is dependent on several factors, including exercise levels, co-morbidities, nutrition, and genetics. Immobility dramatically increases the rate of muscle loss, even in younger people. The hallmark sign of sarcopenia is the loss of lean muscle mass, or muscle atrophy. However, changes in weight, limb, or waist circumference are not reliable indicators of muscle mass changes. Sarcopenia may also cause reduced strength, functional decline, and an increased risk of falling.
The pathologic changes of sarcopenia include a reduction in muscle tissue quality, an increase in fibrosis, changes in muscle metabolism, oxidative stress, and degeneration of the neuromuscular junction. There is also a failure to activate satellite cells upon injury or exercise, which is thought to contribute to the pathophysiology of the disease. In addition, as people grow older, changes in certain hormones, such as testosterone and insulin-like growth factor (IGF-1), affect muscle fibres, which can lead to sarcopenia.
There is currently no consensus diagnosis for sarcopenia, and no FDA-approved medications to treat it. However, it can be diagnosed when a patient has muscle mass that is at least two standard deviations below the relevant population mean and has a slow walking speed. Adequate nutrition and targeted exercise remain the gold standard for therapy, with progressive resistance-based strength training and increased protein intake being recommended.
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Neurogenic atrophy
The amount of time it takes for neurogenic atrophy to occur depends on an individual's health condition, age, and fitness level. Unlike disuse atrophy, which can be reversed with exercise and a healthy diet, neurogenic atrophy typically cannot be reversed due to the physical damage that has been done to the nerves. Treatment for neurogenic atrophy depends on the type.
To diagnose neurogenic atrophy, a healthcare provider will perform a physical examination and ask about the patient's symptoms. 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.
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Physiologic atrophy
Muscle atrophy is the wasting, thinning, or loss of muscle tissue and mass. It can be caused by muscle disuse, nerve problems, or diseases. Physiologic atrophy, or disuse atrophy, is caused by insufficient muscle use. This type of atrophy often results from a sedentary lifestyle, malnutrition, a lack of exercise, seated jobs, health problems that limit movement, or decreased activity levels.
Disuse atrophy can occur within two to three weeks of muscle disuse. When muscles are not used, the body stops expending energy on maintaining them, and they begin to break down, leading to a decrease in muscle size and strength. Physiologic atrophy is not permanent and can often be reversed through regular exercise and improved nutrition. Treatment plans may include progressive resistance-based strength training, physical therapy, and nutritional supplements.
The rate of muscle atrophy from disuse is approximately 0.5–0.6% of total muscle mass per day, with considerable variation between individuals. The elderly are particularly vulnerable to dramatic muscle loss with immobility. Research suggests that prolonged disuse (more than 10 days) leads to muscle atrophy primarily due to declines in muscle protein synthesis rates, while short-term immobility may involve more active protein breakdown.
Prolonged periods of immobilization, such as bed rest or conditions experienced by astronauts in space, are well-known causes of muscle atrophy. Even minor muscle atrophy can lead to a loss of movement or strength, with potential symptoms including tingling, numbness, and weakness in the affected limbs. Physiologic atrophy can be challenging to detect due to factors such as obesity, changes in fat mass, or edema.
To diagnose muscle atrophy, healthcare providers conduct a physical examination, assess medical history, and evaluate symptoms. They may also perform muscle measurements, blood tests, muscle or nerve biopsies, electromyography, nerve conduction studies, computed tomography (CT) scans, and magnetic resonance imaging (MRI) scans. Early detection and intervention are crucial, as muscle atrophy can significantly impact an individual's physical capabilities and quality of life.
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Pathologic atrophy
Muscle atrophy is the wasting or thinning of muscle tissue, resulting in a decrease in muscle mass and strength. There are three types of muscle atrophy: physiologic, pathologic, and neurogenic. Pathologic atrophy is associated with ageing, starvation, and diseases such as Cushing's disease, which can be caused by the overuse of corticosteroids or an overactive adrenal gland. It can also be caused by severe infections, cancer, and malnutrition.
Diseases such as Cushing's disease, which is caused by the prolonged use of corticosteroids or an overactive adrenal gland, can also lead to pathologic atrophy. This is because the excess corticosteroids can have a catabolic effect on muscle tissue, leading to muscle breakdown and atrophy. Additionally, certain infections and cancers can cause muscle breakdown and atrophy due to the disease process itself or the treatments involved.
Malnutrition is another common cause of pathologic atrophy. A lack of adequate nutrition, especially protein, can lead to muscle wasting and atrophy. This is often seen in individuals with eating disorders or those who are unable to absorb nutrients properly due to digestive issues. Malnutrition can also be a consequence of severe infections, cancers, or other diseases, further contributing to muscle atrophy.
The treatment for pathologic atrophy aims to address the underlying cause. For example, if the atrophy is due to malnutrition, improving the individual's nutritional status through dietary changes or supplements can help rebuild muscle mass and strength. If a disease is the underlying cause, treating the disease and managing its symptoms can help slow or stop the progression of muscle atrophy.
In some cases, physical therapy and targeted exercises may be recommended to help stimulate muscle growth and improve strength. It is important to note that the treatment for pathologic atrophy may vary depending on the specific cause and severity of the condition, and a healthcare provider should be consulted for a proper evaluation and treatment plan.
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Frequently asked questions
Muscle atrophy is the wasting, thinning, or loss of muscle tissue and mass. It can be caused by muscle disuse, neurogenic conditions, malnutrition, age, genetics, lack of physical activity, or certain medical conditions.
The symptoms of muscle atrophy vary depending on the cause and severity of muscle loss. Some symptoms include reduced muscle mass, tingling, numbness, and weakness in the arms and legs.
Muscle atrophy can be treated through physical therapy, lifestyle changes, or surgery. Progressive resistance-based strength training and a healthy diet can help reverse the effects of muscle atrophy.
Sarcopenia is the loss of muscle mass, strength, and function due to aging. It commonly affects the elderly as their bodies produce fewer proteins needed for muscle growth.
