Logan Steele
Muscle wasting, or muscle atrophy, is the thinning or loss of muscle tissue due to muscle weakening and shrinking. It is caused by an imbalance between protein synthesis and protein degradation. This can be due to disuse of muscles, neurogenic conditions, malnutrition, age, genetics, or certain medical conditions. Symptoms include a decrease in muscle mass, weakness and numbness in the limbs, and difficulty with physical tasks. Treatment for muscle wasting includes physical therapy, ultrasound therapy, and dietary changes, including adequate calorie and protein intake.
| Characteristics | Values |
|---|---|
| Type | Muscle wasting protein is associated with muscle atrophy |
| Causes | Disuse/inactivity, malnutrition, age, genetics, nerve problems, disease |
| Symptoms | Weakness, difficulty performing physical tasks, decrease in muscle mass, numbness, tingling, trouble swallowing |
| Treatment | Exercise, healthy diet, protein supplementation, physical therapy, ultrasound therapy, surgery |
| Prevention | Adequate calories, protein, and other nutrients, physical activity |
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What You'll Learn
- Muscle atrophy is caused by disuse, malnutrition, ageing, genetics, or nerve problems
- Cachexia is a wasting syndrome caused by underlying diseases such as cancer
- Sarcopenia is age-related muscle atrophy and can be slowed by exercise and protein supplements
- Muscle wasting can be treated with focused ultrasound therapy, physical therapy, and dietary changes
- Conditions causing muscle wasting include muscular dystrophy, multiple sclerosis, and spinal muscular atrophy
Muscle atrophy is caused by disuse, malnutrition, ageing, genetics, or nerve problems
Muscle atrophy is the wasting or thinning of muscle mass. It is caused by disuse, malnutrition, ageing, genetics, nerve problems, or certain medical conditions. Disuse atrophy occurs when muscles are not used enough, leading to a decrease in size and strength. This can be due to a sedentary lifestyle, lack of exercise, or underlying health conditions that limit mobility. Malnutrition and inadequate calorie and protein intake can also contribute to muscle atrophy. Age-related atrophy, known as sarcopenia, is common in older adults and is associated with muscle weakness and a decrease in muscle fibres. Genetic disorders, such as muscular dystrophy, can cause muscle atrophy as well. Neurogenic atrophy is caused by nerve problems or diseases that affect the nerves connecting to the muscles, impairing their ability to trigger muscle contractions. Additionally, certain medical conditions, such as cancer or spinal cord injuries, can lead to complex muscle wasting syndromes.
Disuse atrophy is often reversible with regular exercise and a healthy diet, but it requires time and commitment to regain muscle mass and strength. The rate of atrophy varies among individuals, but it typically occurs within 10 to 42 days of muscle disuse. During this period, muscle protein synthesis rates decline, contributing to muscle loss. However, in cases of nerve damage-induced atrophy, studies have found elevated muscle protein synthesis rates, contrary to the expected decline.
Age-related muscle atrophy, or sarcopenia, is believed to be caused by a decrease in the body's production of proteins necessary for muscle growth, leading to smaller muscle cells. Changes in hormones, such as testosterone and insulin-like growth factor (IGF-1), during ageing also contribute to sarcopenia. The condition affects the elderly population's ability to perform daily tasks and reduces their quality of life. While sarcopenia cannot be prevented, its progression can be slowed down with physical exercise.
Genetic disorders, such as muscular dystrophy or Charcot-Marie-Tooth disease, can also cause muscle atrophy. These disorders impact the nerves that stimulate muscle activity, leading to muscle wasting. Additionally, certain medical conditions, such as cancer, congestive heart failure, chronic obstructive pulmonary disease, chronic kidney disease, and AIDS, can lead to a complex muscle wasting syndrome known as cachexia. Cachexia is associated with dramatic muscle atrophy and cannot be completely reversed with nutritional therapy.
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Cachexia is a wasting syndrome caused by underlying diseases such as cancer
Cachexia, pronounced kak-ex-ee-a, is a wasting syndrome that causes significant weight loss and muscle loss. It is a complication of severe chronic diseases like cancer, congestive heart failure, chronic obstructive pulmonary disease, chronic kidney disease, and AIDS. Cachexia is characterised by a loss of skeletal muscle mass that cannot be fully reversed by conventional nutritional support and leads to progressive functional impairment. It is associated with a dramatic change in body composition, including muscle wasting, and can happen with or without fat loss.
Cachexia is a multifactorial syndrome, meaning that it is caused by a combination of factors related to the underlying disease. These factors include changes in inflammation, metabolism, and brain signalling. Cachexia can also increase metabolism and suppress appetite, which further contributes to muscle loss. The condition is difficult to define and diagnose because it often occurs alongside malnutrition and sarcopenia (age-related muscle atrophy).
The treatment for cachexia focuses on managing the underlying disease and improving nutrition. High-calorie, protein-rich diets may help stabilise weight, but they do not necessarily improve muscle mass. Current protein recommendations for cachexia patients are 1.5g/kg/day, making up 15-20% of daily calories. Additionally, medications such as glucocorticoids, cannabinoids, and progestins have been used to treat cachexia and increase appetite. However, these medications do not stop muscle wasting and may cause side effects such as fluid retention and fat gain.
Research is ongoing to better understand cachexia and develop more effective treatments. For example, β-hydroxy β-methylbutyrate (HMB), a molecule derived from leucine, has shown positive results in treating cachexia in chronic pulmonary disease, hip fracture, and AIDS-related and cancer-related cachexia. Creatine supplementation has also been studied as a potential treatment to reduce muscle wasting, but more research is needed.
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Sarcopenia is age-related muscle atrophy and can be slowed by exercise and protein supplements
Sarcopenia is a type of muscle atrophy that is caused by the natural ageing process. It is characterised by a decrease in both the number and size of muscle fibres, leading to a loss of muscle mass and strength. The condition primarily affects older individuals, with muscle loss often beginning in one's 30s or 40s. The most common symptom of sarcopenia is muscle weakness, which can result in difficulty performing daily activities such as walking, climbing stairs, and maintaining balance.
The development of sarcopenia is influenced by various factors related to ageing. One crucial factor is the body's decreased ability to produce the proteins necessary for muscle growth. Additionally, changes in hormone levels, such as testosterone and insulin-like growth factor (IGF-1), can affect muscle fibres and contribute to sarcopenia. Age-related inactivity and unhealthy dietary habits are also significant risk factors for the condition.
To slow down the progression of sarcopenia, it is essential to address these underlying factors. Engaging in regular physical activity, particularly progressive resistance-based strength training, can help improve muscle strength and reverse muscle loss associated with sarcopenia. Additionally, maintaining a healthy diet that includes sufficient high-quality protein is crucial. Aiming for 20 to 35 grams of protein in each meal can support muscle growth and slow atrophy.
Supplementation with specific nutrients, such as creatine, omega-3 fatty acids, and vitamin D, may also aid in fighting sarcopenia. Creatine, a small protein typically produced by the liver, can be added to the diet through meat or supplements, promoting muscle growth. Omega-3 fatty acids, obtained from seafood or supplements, have been shown to increase muscle growth and enhance the benefits of resistance training. Vitamin D supplements can also reduce the risk of falling by increasing muscle strength.
While sarcopenia is a natural consequence of ageing, implementing lifestyle changes, including exercise and dietary modifications, can significantly slow its progression and help maintain muscle health and functionality as individuals grow older.
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Muscle wasting can be treated with focused ultrasound therapy, physical therapy, and dietary changes
Muscle wasting, or muscle atrophy, is the thinning or wasting of muscle mass. It can be caused by the disuse of muscles or neurogenic conditions. The predominant symptom is weakness, which may result in difficulty or inability in performing physical tasks depending on which muscles are affected.
Disuse atrophy can be treated with physical therapy and exercise plans. Even if certain joints cannot be moved, exercises can be done wearing a splint or brace. Physical therapy may also involve electrical stimulation, where electrodes are placed on the skin over the muscles, sending small electrical impulses to the nerves and muscles to help maintain muscle mass and strength.
Neurogenic atrophy can sometimes be treated with a special kind of physical therapy called electrical stimulation. However, it typically cannot be reversed due to the physical damage done to the nerves.
Dietary changes are also crucial in treating muscle wasting. Adequate calories and protein are essential to prevent muscle atrophy. Protein needs may vary depending on metabolic factors and disease states, so high-protein supplementation may be beneficial. Nutritional supplements and a healthy eating plan may be recommended by a dietitian.
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Conditions causing muscle wasting include muscular dystrophy, multiple sclerosis, and spinal muscular atrophy
Muscle wasting, or atrophy, is caused by an imbalance between protein synthesis and protein degradation. This can be due to underlying diseases such as cancer, congestive heart failure, chronic obstructive pulmonary disease, chronic kidney disease, or AIDS. It can also be caused by injury or stroke, or be the result of prolonged immobility.
Muscular dystrophy is a group of diseases that cause muscles to waste away and weaken over time. The symptoms of the most common type of muscular dystrophy start in childhood, mostly in boys, but other types can begin in adulthood. The symptoms include muscle pain and stiffness, learning or behavioural challenges, and delayed growth. The muscles in the shoulders, upper arms, and calves are particularly affected. Some people with the disease also develop heart conditions.
Spinal muscular atrophy (SMA) is a disorder affecting the motor neurons—nerve cells that control voluntary muscle movement. SMA causes muscles to atrophy, weaken, and shrink due to inactivity. SMA is classified as type 1, 2, 3, or 4 depending on the age of onset, with type 1 being the most severe, striking infants within the first six months of life. SMA type 2 emerges when a child is between six and 18 months old, and type 3 when a child is 18 months old or older. The later the symptoms develop, the better the outcome for motor function.
Multiple sclerosis is another condition that can cause muscle wasting. It is a disease of the central nervous system that affects the brain, spinal cord, and optic nerves. It can cause a variety of symptoms, including muscle weakness, spasticity, and difficulty with coordination and balance.
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Frequently asked questions
Muscle wasting, also known as muscle atrophy, is the thinning or loss of muscle tissue due to muscle weakening and shrinking. It can be caused by muscle disuse, neurogenic conditions, malnutrition, age, genetics, or certain medical conditions.
Symptoms of muscle wasting include a decrease in muscle mass, one limb being smaller than the other, weakness, numbness, and tingling in the limbs. There may also be difficulty with swallowing or speaking, walking, or balancing.
Treatment for muscle wasting includes physical therapy, ultrasound therapy, and in some cases, surgery. Dietary changes, such as adequate calorie and protein intake, are also crucial to preventing and treating muscle wasting. In some cases, focused ultrasound therapy may be used to stimulate muscle contraction and decrease muscle loss.
