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Muscle atrophy is the thinning or loss of muscle tissue, which can cause muscle weakness and disability. It can be caused by immobility, aging, malnutrition, medications, or a wide range of injuries or diseases that impact the musculoskeletal or nervous system. The symptoms of muscle atrophy vary depending on the cause and severity of muscle loss, but they may include reduced muscle mass, difficulty performing physical tasks, and trouble swallowing or speaking. Sarcopenia, for example, is a type of muscle atrophy that is age-related and can cause a reduction in functional status and significant disability. Other types of muscle atrophy include physiologic atrophy, caused by not using muscles enough, and neurogenic atrophy, caused by nerve problems or diseases.
| Characteristics | Values |
|---|---|
| Definition | Wasting or thinning of muscle mass |
| Muscle Loss | Loss of lean muscle mass |
| Symptoms | Muscle weakness, difficulty swallowing, difficulty breathing, difficulty performing physical tasks, loss of stamina, trouble walking or balancing, poor balance and falls, etc. |
| Types | Physiologic atrophy, pathologic atrophy, neurogenic atrophy |
| Causes | Inactivity, aging, malnutrition, medications, nerve problems, genetic disorders, etc. |
| Treatments | Physical therapy, surgery, lifestyle changes, functional electrical stimulation, anabolic agents, etc. |
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What You'll Learn
- Muscle atrophy is caused by inactivity, ageing, malnutrition, medications, or injuries/diseases
- Sarcopenia is age-related muscle atrophy and can be slowed by exercise
- Myositis, an inflammation of the muscles, can cause muscle atrophy
- Mitochondrial dysfunction affects muscle tissue regulation and can lead to skeletal muscle atrophy
- Muscle atrophy can be treated with lifestyle changes, physical therapy, or surgery
Muscle atrophy is caused by inactivity, ageing, malnutrition, medications, or injuries/diseases
Muscle atrophy is the thinning or wasting of muscle tissue. It can be caused by a variety of factors, including inactivity, ageing, malnutrition, medications, and injuries/diseases.
Inactivity or disuse of muscles is a common cause of muscle atrophy. This can be due to a sedentary lifestyle, a desk job, or health problems that limit movement. When muscles are not used, the body starts to break them down, leading to a decrease in muscle size and strength. This type of atrophy is known as physiologic atrophy and can often be reversed with exercise and improved nutrition.
Ageing is another significant factor contributing to muscle atrophy. As people age, their bodies produce fewer proteins necessary for muscle growth, leading to a condition called sarcopenia. Sarcopenia is characterised by a gradual loss of muscle mass, strength, and function, primarily affecting the elderly population. Age-related hormonal changes, such as decreases in testosterone and insulin-like growth factor (IGF-1), also contribute to muscle atrophy in older adults.
Malnutrition is a further cause of muscle atrophy. This can be due to conditions that impair the body's ability to absorb nutrients or a lack of sufficient protein in the diet. Medical conditions such as cachexia, which causes extreme weight loss, can lead to muscle atrophy by impairing nutrient absorption. Additionally, certain medications can increase the risk of muscle atrophy, particularly corticosteroids, which are associated with Cushing disease.
Injuries or diseases affecting the nerves that connect to the muscles can result in neurogenic atrophy. Conditions such as amyotrophic lateral sclerosis (ALS), Guillain-Barre syndrome, carpal tunnel syndrome, and spinal cord injuries can damage the nerves responsible for stimulating muscle activity. When these nerves are compromised, the muscles they innervate can atrophy.
Muscle atrophy can also be influenced by genetics. Certain genetic disorders, such as muscular dystrophy and Charcot-Marie-Tooth disease, can predispose individuals to muscle atrophy. Additionally, specific medications can increase the risk of muscle atrophy, as mentioned earlier.
The symptoms of muscle atrophy include a decrease in muscle mass, with one limb sometimes appearing smaller than the other. Weakness, numbness, and tingling in the limbs are also common symptoms. In more severe cases, individuals may experience difficulty walking, balancing, swallowing, or speaking. Treatment for muscle atrophy aims to address the underlying cause and may include physical therapy, functional electrical stimulation, or surgery.
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Sarcopenia is age-related muscle atrophy and can be slowed by exercise
Muscle atrophy is the wasting or loss of muscle tissue. People may lose 20 to 40 percent of their muscle mass and, along with it, their strength as they age. The primary cause of muscle atrophy is inactivity. If a person does not use a particular muscle, the body eventually breaks it down to conserve energy. This type of atrophy can often be reversed with exercise and better nutrition.
Sarcopenia is a type of muscle atrophy primarily caused by the natural aging process. It is a serious public health concern among older adults worldwide. The condition commonly affects the elderly population and is thought to occur due to aging. Sarcopenia can greatly impact one's quality of life by reducing their ability to perform daily tasks. From the time a person is born to around the time they turn 30, their muscles grow larger and stronger. But at some point in their 30s, they start to lose muscle mass and strength. The loss can become more noticeable and start to speed up at around age 60.
The most common symptom of sarcopenia is muscle weakness. Other symptoms may include loss of stamina, difficulty performing daily activities, walking slowly, trouble climbing stairs, poor balance and falls, and decrease in muscle size. The prevalence of sarcopenia increases with age, ranging from 5–13% in those aged 60–70 years to 11–50% in those 80 years and older.
Exercise is the most common intervention for sarcopenia. Resistance and balance exercises with or without nutrition are the most effective for improving physical function. High or moderate-certainty evidence showed that resistance and balance exercise plus nutrition was the most effective for improving handgrip strength. Aerobic exercise provides at least a partial solution to sarcopenia as it ameliorates mitochondria-derived problems, and resistance exercise strengthens muscle mass and function. Furthermore, combinations of these exercise types provide the most benefits.
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Myositis, an inflammation of the muscles, can cause muscle atrophy
Muscle atrophy refers to the wasting or loss of muscle tissue. It can be caused by inactivity, illness, or injury. Myositis, an inflammation of the muscles, can also cause muscle atrophy.
Myositis is a rare disease that causes the immune system to attack the muscles. It can be triggered by infection, injury, autoimmune conditions, or drug side effects. Viral infections are the most common infectious cause of myositis, but bacteria, fungi, or other organisms can also trigger it. In some cases, myositis develops after a viral infection such as the common cold or influenza. Certain medications can also cause temporary muscle damage and myositis.
The symptoms of myositis include muscle weakness, pain, and swelling. It can affect the muscles in the arms, shoulders, legs, hips, abdomen, neck, back, and spine. Myositis can make it difficult to perform everyday activities such as climbing stairs or reaching overhead. In some cases, myositis can cause trouble swallowing or breathing.
There is currently no cure for myositis, but treatments are available to help manage the symptoms. These treatments may include physical therapy, exercises, and medications. It is important to see a healthcare provider for a proper diagnosis and treatment plan if myositis is suspected.
While muscle atrophy due to inactivity can often be reversed with exercise and physical therapy, atrophy caused by myositis may require more aggressive treatment. Treating the underlying cause of myositis can help slow the progression of muscle loss. However, it is important to note that myositis can cause significant disability and even death if left untreated.
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Mitochondrial dysfunction affects muscle tissue regulation and can lead to skeletal muscle atrophy
Skeletal muscle is the most abundant tissue in the human body, comprising around 40% of total body mass. It is essential for maintaining posture and facilitating movement and force production. Mitochondria, which produce the majority of the energy required for cellular metabolic activities, are crucial for maintaining skeletal muscle health. Mitochondrial dysfunction can trigger catabolic signalling pathways, promoting the expression of muscle atrophy genes.
Mitochondrial dysfunction has been shown to play a significant role in skeletal muscle atrophy. This dysfunction can be caused by a variety of factors, including prolonged immobilization, cachexia, ageing, drug-induced toxicity, and cardiovascular diseases. During prolonged muscle inactivity, mitochondria undergo rapid decreases in respiratory capacity and coupling, decreased volume, increased reactive oxygen species (ROS) emission, and morphological changes. The accumulation of ROS in mitochondria can lead to oxidative damage and decreased mitochondrial membrane potential, resulting in excessive activation of mitophagy and damage to muscle tissue.
Mitochondrial dynamics, which involve the continuous fusion and fission of mitochondria, are fundamental processes in mitochondrial metabolism. When this process is disrupted, it can trigger skeletal muscle atrophy. Mitochondrial dysfunction caused by blocked mitophagy is often considered a primary cause of skeletal muscle atrophy. Additionally, the targeted deletion of certain proteins, such as DRP1, has been linked to severe skeletal muscle atrophy by impairing protein synthesis and disrupting calcium homeostasis between the cytoplasm and mitochondria.
The understanding of the role of mitochondrial dysfunction in skeletal muscle atrophy has important implications for the development of therapeutic strategies. Targeted mitochondrial therapy has emerged as an effective approach, directly regulating mitochondria and improving treatment efficiency. Strategies such as mitochondria-targeted drug therapy, exercise and diet therapy, and mitochondria-targeted gene therapy show promise in delaying muscle atrophy and improving mitochondrial function. Furthermore, pharmacological interventions aimed at rebalancing mitophagy and alleviating oxidative stress have been investigated to preserve muscle integrity and function.
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Muscle atrophy can be treated with lifestyle changes, physical therapy, or surgery
Muscle atrophy is the wasting or thinning of muscle mass. It can be caused by disuse of muscles or neurogenic conditions. Symptoms include a decrease in muscle mass, one limb being smaller than the other, and numbness, weakness and tingling in the limbs. It can be treated with lifestyle changes, physical therapy, or surgery.
Disuse (physiologic) atrophy occurs when muscles are not used enough. It can be caused by leading a sedentary lifestyle, malnutrition, a lack of exercise, age, genetics, or certain medical conditions. This type of atrophy can be treated with lifestyle changes, such as regular exercise and a healthy diet. Working out in a pool can be beneficial as it reduces the muscle workload. It may take a few months to see improvements, and it may take much longer to fully recover muscle strength.
Neurogenic atrophy occurs due to nerve problems or diseases. It is caused by an injury or disease affecting the nerves that connect to the muscles. When these nerves are damaged, they cannot trigger the muscle contractions needed to stimulate muscle activity. Diseases and conditions that can affect these nerves include amyotrophic lateral sclerosis (ALS), Guillain-Barre syndrome, carpal tunnel syndrome, spinal cord injury, and multiple sclerosis. Neurogenic 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.
In some cases, surgery may be required to treat muscle atrophy. If an individual develops a contracture due to muscle atrophy, surgery may be performed to correct it. A contracture occurs when muscle tissues become fibrous, making it hard to stretch the muscle and preventing movement.
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Frequently asked questions
Muscle atrophy is the wasting or thinning of muscle mass. It can be caused by immobility, aging, malnutrition, medications, or a wide range of injuries or diseases that impact the musculoskeletal or nervous system.
The symptoms of muscle atrophy vary depending on the cause and severity of muscle loss. The predominant symptom is weakness, which may result in difficulty or inability in performing physical tasks depending on what muscles are affected. Other symptoms include:
- One arm or leg being noticeably smaller than the others
- Numbness or tingling in the arms and legs
- Trouble walking or balancing
- Difficulty swallowing or speaking
Treatment for muscle atrophy depends on the underlying cause but often includes exercise, physical therapy, and adequate nutrition. Functional electrical stimulation (FES) is another effective treatment. In some cases, surgery may be required.
