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Muscle-wasting diseases, also known as muscle atrophy, refer to the wasting or thinning of muscle mass. This can be caused by disuse of muscles or neurogenic conditions. Physiologic atrophy, caused by insufficient muscle use, can be reversed with exercise and a healthy diet. Pathologic atrophy is associated with aging, starvation, and diseases such as Cushing's disease. Neurogenic atrophy, the most severe form, is caused by nerve injuries or diseases that affect the muscles. Muscle-wasting diseases can also be genetic, such as muscular dystrophy, which causes progressive muscle weakness and wasting. Multiple sclerosis and spinal muscular atrophy are other conditions that contribute to muscle wasting.
| Characteristics | Values |
|---|---|
| Type | Muscle wasting diseases are of two types: Muscle atrophy and muscular dystrophy. |
| Causes | Muscle atrophy is caused by disuse of muscles, neurogenic conditions, malnutrition, ageing, genetics, or lack of physical activity. Muscular dystrophy is caused by abnormal genes that interfere with the production of proteins needed to form healthy muscles. |
| Symptoms | Muscle atrophy symptoms include decrease in muscle mass, weakness, numbness, and tingling in limbs. Muscular dystrophy symptoms include progressive muscle weakness, trouble walking, trouble using arms, and shortening of muscles or tendons around joints. |
| Treatment | Muscle atrophy can be treated with exercise and a healthy diet. Muscular dystrophy can be managed with medications and therapy. |
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What You'll Learn
- Muscular dystrophy is a group of inherited diseases causing muscle weakness and wasting
- Multiple sclerosis (MS) is an autoimmune disease that affects nerves and muscles
- Spinal muscular atrophy is a genetic disease causing loss of motor neurons and muscle weakness
- Muscle atrophy is the wasting of muscle tissue due to disuse or neurogenic conditions
- Causes of muscle wasting include malnutrition, ageing, and prolonged inactivity
Muscular dystrophy is a group of inherited diseases causing muscle weakness and wasting
Muscle atrophy, or muscle wasting, can be caused by several factors, including disuse of muscles, neurogenic conditions, malnutrition, ageing, genetics, and certain medical conditions. One such medical condition is muscular dystrophy, a group of inherited diseases that cause muscle weakness and wasting.
Muscular dystrophy is characterised by mutations in the genes responsible for healthy muscle structure and function. These mutations interfere with the production of proteins necessary for forming healthy muscles. As a result, the cells that typically maintain muscles can no longer do so, leading to progressive muscle weakness and wasting. The symptoms of muscular dystrophy vary depending on the specific type, but they generally worsen over time.
There are over 30 types of muscular dystrophy, which can be classified based on specific features or the location of initial symptoms. For example, myotonic dystrophy, the most common adult-diagnosed type, affects an individual's ability to relax their muscles after use. Facioscapulohumeral (FSHD) muscular dystrophy typically causes muscle weakness in the face, hips, and shoulders. Congenital muscular dystrophies (CMD) cause overall muscle weakness and may also lead to joint stiffness or looseness, spinal curvature, breathing issues, intellectual disabilities, and eye problems.
The treatment options for muscular dystrophy aim to manage symptoms and slow the progression of the disease. While there is currently no cure, medications, therapy, and surgical interventions can help improve quality of life. Additionally, early treatment with ACE inhibitors and beta-blockers may slow the progression of cardiomyopathy and prevent heart failure, a potential complication of myotonic dystrophy.
It is important to note that muscle wasting can also be a symptom of other conditions, such as multiple sclerosis, spinal muscular atrophy, heart failure, sepsis, and cancer. Therefore, a comprehensive medical evaluation is necessary to determine the underlying cause of muscle wasting and develop an appropriate treatment plan.
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Multiple sclerosis (MS) is an autoimmune disease that affects nerves and muscles
Muscle wasting, or muscle atrophy, is the thinning or wasting of muscle mass. It can be caused by various factors, including disuse of muscles, neurogenic conditions, malnutrition, ageing, genetics, and certain medical conditions. Some of the medical conditions that cause muscle wasting include muscular dystrophy, multiple sclerosis, and spinal muscular atrophy.
Multiple sclerosis (MS) is an autoimmune disease that affects the brain and spinal cord (central nervous system). It is a chronic and incurable disease that can cause muscle weakness and wasting. MS affects the myelin sheath, a protective covering that surrounds nerve cells. When the myelin sheath is damaged, nerve signals slow down or stop, leading to problems with movement, coordination, and thinking. The nerve damage caused by MS results in the loss of the ability to trigger muscle movement, leading to atrophy.
MS is an unpredictable disease, and its symptoms can vary widely in severity and duration. Common symptoms include vision problems, trouble walking, tingling sensations, movement disorders, coordination issues, and cognitive difficulties. Some people with MS may experience only mild symptoms, while others may lose their ability to see clearly, write, speak, or walk. In some cases, MS can lead to partial or complete paralysis.
The exact cause of MS is unknown, but it is believed to be caused by a combination of genetic and environmental factors. It is more commonly diagnosed in women than in men, typically between the ages of 20 and 40. Treatment options for MS focus on managing symptoms, slowing disease progression, and preventing complications. While there is no cure, medications, physical therapy, speech therapy, occupational therapy, and support groups can help improve quality of life.
Overall, multiple sclerosis is a complex autoimmune disease that can significantly impact an individual's nervous system and muscles. While there have been advancements in treatment options, further research is needed to find a cure and improve the management of this unpredictable disease.
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Spinal muscular atrophy is a genetic disease causing loss of motor neurons and muscle weakness
Muscle wasting, or atrophy, is the thinning or wasting of muscle mass. It can be caused by various factors, including malnutrition, ageing, genetics, lack of physical activity, and certain medical conditions. Some of the medical conditions that can cause muscle wasting include muscular dystrophy, multiple sclerosis, and spinal muscular atrophy.
Spinal muscular atrophy (SMA) is a genetic neuromuscular disorder that causes muscle weakness and wasting. SMA is characterised by the loss of motor neurons, which are nerve cells in the spinal cord that control muscle movement. When these motor neurons are lost, the muscles do not receive the signals needed to move, leading to muscle weakness and atrophy. The muscle weakness caused by SMA tends to be more severe in the proximal muscles, which are those closer to the centre of the body, such as the chest and upper leg and arm muscles.
There are five subtypes of SMA, classified based on the average age of onset and severity of symptoms. SMA type 0 is the rarest and most severe form, evident before birth, with infants often having joint deformities and extremely weak muscle tone at birth. SMA type I, also known as Werdnig-Hoffmann disease, is the most common form, with muscle weakness evident at birth or within the first few months of life. Children with SMA type I often cannot control their head movements and have swallowing problems, leading to poor growth. SMA type II and III are the next most common subtypes, while type IV is rare and typically presents with mild leg weakness.
The genetic cause of SMA is associated with mutations in the SMN1 gene, which is responsible for producing the survival motor neuron (SMN) protein. This protein is essential for the health and function of motor neurons. Individuals with SMA have insufficient levels of SMN protein, leading to the loss of motor neurons and subsequent muscle weakness and atrophy. The number of copies of the SMN2 gene can modify the severity of SMA, with a higher number of copies typically resulting in less severe features of the condition.
Treatment for SMA aims to increase the production of SMN protein and improve muscle movement and function. Early treatment is generally more beneficial, as older individuals with SMA may have experienced greater motor neuron loss. Medications such as nusinersen (Spinraza) and onasemnogene abeparovec-xioi (Zolgensma) have been shown to increase SMN protein production and improve outcomes for people with SMA. Physical therapy, occupational therapy, and rehabilitation can also help improve posture, prevent joint immobilisation, and enhance overall quality of life.
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Muscle atrophy is the wasting of muscle tissue due to disuse or neurogenic conditions
Muscle atrophy, or muscle wasting, is the thinning or loss of muscle tissue. It involves a significant shortening of the muscle fibres and a loss of overall muscle mass. This condition can occur due to several factors, including disuse or neurogenic conditions.
Disuse atrophy, or physiologic atrophy, occurs when muscles are not used enough. If an individual stops using their muscles, the body conserves energy by breaking down the muscles, causing a decrease in size and strength. This type of atrophy is commonly observed in people who lead sedentary lifestyles, are malnourished, do not exercise enough, or are confined to bed rest. It can also be caused by underlying genetic disorders such as muscular dystrophy or Charcot-Marie-Tooth disease. Disuse atrophy can often be reversed through regular exercise, physical therapy, and improved nutrition.
Neurogenic atrophy, on the other hand, is caused by nerve problems or diseases affecting the nerves that connect to the muscles. When these nerves are damaged, they lose their ability to trigger the necessary muscle contractions, leading to a decrease in muscle mass and strength. Examples of conditions that can cause neurogenic atrophy include amyotrophic lateral sclerosis (ALS), multiple sclerosis (MS), and spinal muscular atrophy.
Muscle atrophy can also be caused by certain medical conditions, such as arthritis, myositis, mitochondrial dysfunction, and polio. Additionally, ageing, malnutrition, and genetic factors can contribute to muscle wasting. Treatment options for muscle atrophy include exercise, targeted mitochondrial therapy, focused ultrasound therapy, and in some cases, surgery.
It is important to note that muscle atrophy can have various causes, and a comprehensive diagnosis by a healthcare provider is essential to determine the underlying reasons and recommend appropriate treatment options.
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Causes of muscle wasting include malnutrition, ageing, and prolonged inactivity
Muscle wasting, or atrophy, is the thinning or loss of muscle mass. Causes of muscle wasting include malnutrition, ageing, and prolonged inactivity.
Malnutrition has been found to be a significant and independent risk factor for acute muscle wasting in older patients. Malnourished patients have been observed to lose grip and knee extension strength during hospital stays. Malnutrition, in combination with physical factors, can lead to a higher risk of falls and functional disability in older patients.
Ageing is a natural cause of muscle atrophy, also known as sarcopenia, which becomes more common as people get older. Sarcopenia involves a decrease in muscle mass and strength and can decrease lifespan and quality of life. Older people may also be more susceptible to malnutrition due to changes in their sense of taste, dental issues, and difficulties with shopping and cooking.
Prolonged inactivity or disuse of muscles can also lead to muscle wasting. If muscles are not used enough, the body will start to break them down, leading to a decrease in size and strength. This can be caused by leading a sedentary lifestyle, having a desk job, or being on bed rest. Disuse atrophy can be reversed with exercise and a healthy diet.
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Frequently asked questions
Muscle wasting, or muscle atrophy, is the decrease in size and wasting of muscle tissue. It can be caused by disuse of muscles, neurogenic conditions, malnutrition, ageing, genetics, or certain medical conditions.
Some medical conditions that can lead to muscle wasting include muscular dystrophy, multiple sclerosis, spinal muscular atrophy, and heart failure.
Muscular dystrophy is a group of inherited diseases that cause progressive muscle weakness and loss of muscle mass. It occurs when certain genes involved in making proteins that protect muscle fibres are defective. There are many types of muscular dystrophy, including Duchenne, Becker, myotonic, facioscapulohumeral, and limb-girdle MD.
Symptoms of muscular dystrophy vary depending on the type but often include progressive muscle weakness, trouble walking or using arms, and deformities such as scoliosis. The onset of symptoms can range from childhood to adulthood, with certain types affecting males more than females.
Yes, in some cases, muscle wasting can be treated and even reversed. Treatment options include exercise, focused ultrasound therapy, and nutritional improvements. For muscle wasting caused by an underlying condition, treating that condition may help prevent further muscle wasting.
