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Muscle atrophy, or muscle wasting, is the wasting or thinning of muscle mass. It is caused by the muscles weakening and shrinking and can be triggered by several factors, including disuse of muscles, neurogenic conditions, malnutrition, ageing, and certain medical conditions. Disuse atrophy, also known as physiologic atrophy, is caused by a lack of physical activity or sedentary lifestyle, leading to a decrease in muscle size and strength. Neurogenic atrophy is caused by injuries or diseases affecting the nerves connected to the muscles, resulting in muscle contractions and activity disruptions. Age-related atrophy, or sarcopenia, is another common form of muscle atrophy, primarily caused by the natural ageing process, with muscle loss accelerating from the age of 65 to 80. Malnutrition, inadequate protein intake, and certain medical conditions, such as amyotrophic lateral sclerosis (ALS) and muscular dystrophy, can also contribute to muscle deterioration. Early diagnosis and treatment are crucial, with exercise, proper nutrition, and physical therapy playing vital roles in reversing or managing muscle atrophy.
| Characteristics | Values |
|---|---|
| Type | Physiologic, Pathologic, Neurogenic |
| Causes | Lack of physical activity, aging, malnutrition, nerve damage, underlying health conditions |
| Symptoms | Reduced muscle mass, weakness, numbness, tingling, difficulty swallowing or speaking, gradual memory loss |
| Treatments | Exercise, healthy diet, physical therapy, ultrasound therapy, surgery |
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What You'll Learn
Lack of physical activity
Muscle atrophy, or muscle wasting, is the thinning or wasting of muscle mass. It can be caused by the disuse of muscles or neurogenic conditions. Disuse atrophy, or physiologic atrophy, is caused by not using muscles enough. This can be due to a sedentary lifestyle, desk jobs, health problems that limit movement, or old age.
Disuse atrophy can be reversed with exercise and a healthy diet. Doctors may recommend exercises in a swimming pool to reduce muscle workload, or other types of rehabilitation. An exercise program can help prevent and treat muscle wasting, and the type of activity recommended will depend on the cause of the atrophy. Ultrasound therapy is a new treatment that involves directing beams of high-frequency sound waves at specific areas of the body to stimulate muscle contraction and decrease muscle loss.
Physiologic atrophy can also be treated with proper nutrition, as the body needs sufficient calories, protein, and other nutrients to build and retain muscle. This is especially true as people age, as the body produces fewer proteins that the muscles need to grow. Changes in hormone levels, such as testosterone and insulin-like growth factor, can also affect muscle fibers and lead to atrophy.
Malnutrition can also cause muscle atrophy, as it results in an inadequate nutritional intake. This can be due to anorexia nervosa, cancer, or persistent nausea. In these cases, surgery may be able to correct the atrophy, and doctors may suggest dietary changes or supplements.
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Neurological conditions
Neurogenic atrophy is the most severe type of muscle atrophy and tends to occur more suddenly than other types. Examples of neurological conditions that can lead to neurogenic atrophy include:
- Amyotrophic lateral sclerosis (ALS) or Lou Gehrig's disease: This progressive disease affects nerve cells throughout the body, including those in the brain and spinal cord, which normally send messages to the muscles to initiate movement. In people with ALS, these nerve cells die, leading to a loss of voluntary movement and subsequent muscle atrophy.
- Multiple sclerosis (MS): An autoimmune disease that damages the myelin surrounding nerve fibres. This damage impairs the nerves' ability to trigger muscle movement, resulting in atrophy.
- Muscular dystrophy: A genetic condition characterised by progressive muscle weakness and wasting. There are various types of muscular dystrophy, such as Duchenne MD, myotonic dystrophy, and facioscapulohumeral MD, each affecting different areas of the body with varying severity.
- Carpal tunnel syndrome: This condition involves damage to a single nerve, typically causing numbness, tingling, and pain in the hand and arm.
It is important to note that neurological conditions are not the only cause of muscle deterioration. Other factors include disuse or physiologic atrophy, which results from a lack of physical activity or sedentary lifestyle, and can be treated with exercise and proper nutrition. Age-related atrophy, known as sarcopenia, is also a common cause of muscle loss, primarily due to the natural ageing process and associated hormonal changes.
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Genetic disorders
Muscular dystrophy is a group of over 30 genetic disorders that cause progressive muscle weakness and wasting, affecting 1 in 5,000 individuals worldwide. The condition is caused by mutations in the genes responsible for muscle structure and function, leading to the degeneration and loss of muscle fibres. This results in muscle weakness that worsens over time, making everyday tasks more difficult.
There are multiple types of muscular dystrophy, each differing in the muscles affected, the age of onset, and the rate of progression. Some common types include:
- Duchenne muscular dystrophy: This is the most common form and is caused by a mutation on the X chromosome. It typically affects males, with symptoms appearing in early childhood, and can lead to rapid progression, resulting in wheelchair dependence by adolescence.
- Becker muscular dystrophy: This is the second most common type and is also X-linked. It tends to have milder symptoms and a slower progression compared to Duchenne muscular dystrophy.
- Facioscapulohumeral muscular dystrophy (FSHD): FSHD initially affects the muscles of the face, shoulders, and upper arms, causing progressive weakness. It is characterised as an autosomal dominant disorder and has a slow disease progression.
- Myotonic dystrophy: With this type, the muscles cannot relax at will. Facial and neck muscles are often affected first, followed by weakness in the muscles involved in breathing.
In addition to muscle weakness, muscular dystrophy can also impact other organs, such as the heart, lungs, gastrointestinal system, endocrine glands, spine, eyes, and brain. Some people with muscular dystrophy may experience swallowing difficulties, which can lead to nutritional deficiencies and an increased risk of lung infection.
Genetic testing can help identify the presence of muscular dystrophy and determine the specific type. While there is currently no cure, treatments are available to manage symptoms and slow the progression of the disease. Muscular Dystrophy UK is a charity that provides support and information to people with muscular dystrophy and their families.
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Age-related atrophy
Age-related muscle atrophy, also known as sarcopenia, is a type of muscle atrophy that specifically affects people as they grow older. Sarcopenia is the age-related progressive loss of muscle mass and strength. It is primarily caused by the natural ageing process, with muscle loss beginning sometime in a person's 30s or 40s and accelerating between the ages of 65 and 80.
The ageing process causes a variety of changes in the body that contribute to sarcopenia. For example, the body produces fewer proteins that muscles need to grow, resulting in smaller muscle cells. Additionally, changes in hormone levels, such as testosterone and insulin-like growth factor (IGF-1), can affect muscle fibres, leading to sarcopenia.
Physical inactivity and a poor diet are also believed to contribute to age-related atrophy. As people age, they may become less physically active, which can accelerate muscle loss. Furthermore, an unhealthy diet, particularly one lacking sufficient protein, can impact the body's ability to maintain and build muscle.
While age-related muscle atrophy is a natural part of the ageing process, there are ways to slow down its progression and manage its effects. Regular exercise, especially strength-building activities, can help prevent and treat muscle atrophy by stimulating muscle contraction and growth. Proper nutrition, including sufficient calories, protein, and other muscle-building nutrients, is also crucial for muscle retention and development. In some cases, physical therapy or focused ultrasound therapy may be recommended to help slow muscle loss and improve overall condition.
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Malnutrition
People who are malnourished do not consume enough nutrients to maintain their muscle health. This can result in a decrease in muscle mass and strength, which can impact their ability to perform daily tasks and maintain their independence. Malnutrition is a particular concern for older individuals, who already experience a natural decline in muscle mass and strength with age.
The impact of malnutrition on muscle health is a growing area of research. Studies have shown that malnourished patients experience a decline in muscle mass and strength during hospitalization. For example, a study of older patients in a German hospital found that malnourished patients lost 7.0 cm2 of mean mid-thigh muscle cross-sectional area (CSA) during their hospital stay, while non-malnourished patients showed no significant change.
Additionally, malnutrition was found to be a significant independent risk factor for the reduction of muscle CSA. This highlights the importance of addressing malnutrition in clinical settings to prevent and treat muscle wasting. Early identification of malnutrition in high-risk populations is crucial, as well as the implementation of appropriate nutritional strategies and lifestyle interventions.
The treatment for muscle atrophy caused by malnutrition involves improving nutrition and increasing physical activity. A healthy diet that provides sufficient calories, protein, and other essential nutrients is recommended. Physical therapy and exercises, such as swimming, can also help to slow muscle decline and improve muscle strength.
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Frequently asked questions
Muscle atrophy is the wasting or thinning of muscle mass. It can be caused by disuse of muscles or neurogenic conditions.
Symptoms of muscle atrophy include a decrease in muscle mass, weakness, numbness, and tingling in the limbs. In more severe cases, it can lead to difficulty walking, balancing, swallowing, or speaking.
Muscle atrophy can be caused by a lack of physical activity or specific medical conditions. Leading a sedentary lifestyle, having a desk job, or being on bed rest can contribute to muscle atrophy. Underlying health conditions, such as neurological disorders or genetic diseases, can also lead to muscle atrophy.
Treatment for muscle atrophy aims to restore muscle mass and function. It often involves a combination of exercise, proper nutrition, and physical therapy. In some cases, underlying medical conditions need to be addressed, and surgery may be required.
To prevent muscle atrophy, it is essential to maintain a physically active lifestyle and ensure proper nutrition. Regular exercise, especially strength-building activities, can help prevent muscle atrophy. A balanced diet with sufficient calories, protein, and other essential nutrients is also crucial for muscle health.
