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Peripheral muscle wasting, or muscle atrophy, is a common occurrence in advanced chronic obstructive pulmonary disease (COPD) and several other chronic diseases. It involves a significant shortening of the muscle fibres and a loss of overall muscle mass. Muscle atrophy can be caused by the disuse of muscles, malnutrition, ageing, genetics, or certain medical conditions. Disuse atrophy can be caused by a sedentary lifestyle, illness, injury, or old age, leading to a decrease in muscle mass and strength. Neurogenic atrophy, on the other hand, is caused by nerve problems or diseases that affect the nerves connected to the muscles. Treatment for muscle atrophy includes exercise, physical therapy, ultrasound therapy, and in some cases, surgery.
| Characteristics | Values |
|---|---|
| Definition | Peripheral muscle wasting is the loss of muscle mass in the peripheral muscles. |
| Causes | Lack of physical activity, malnutrition, nerve problems or diseases, aging, genetics, and certain medical conditions. |
| Symptoms | Decrease in muscle mass, weakness, numbness, and tingling in the limbs, trouble walking or balancing, and difficulty swallowing or speaking. |
| Diagnosis | Physical examination, blood tests, muscle or nerve biopsy, electromyography (EMG), nerve conduction studies, computed tomography (CT) scans, and magnetic resonance imaging (MRI) scans. |
| Treatment | Exercise, physical therapy, ultrasound therapy, surgery, and nutritional intervention. |
| Associated Conditions | Chronic obstructive pulmonary disease (COPD), amyotrophic lateral sclerosis (ALS), multiple sclerosis (MS), muscular dystrophy, and spinal muscular atrophy. |
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What You'll Learn
- Peripheral muscle wasting is associated with chronic obstructive pulmonary disease (COPD)
- Muscle wasting is caused by muscle weakening and shrinking
- Malnutrition can cause muscle wasting
- Neurogenic atrophy is caused by nerve problems or diseases
- Muscular dystrophy is a genetic condition that leads to muscle wasting
Peripheral muscle wasting is associated with chronic obstructive pulmonary disease (COPD)
Peripheral muscle wasting, or muscle atrophy, is the thinning or wasting of muscle mass. It can be caused by muscle disuse or neurogenic conditions. Peripheral muscle wasting is often associated with chronic obstructive pulmonary disease (COPD).
Muscle wasting is a common finding in advanced COPD and several other chronic diseases. It is caused by repeated bursts of ROS occurring within the peripheral muscles of patients with COPD during daily activities. Although patients with COPD have a low grade of systemic inflammation, they also show a higher prevalence of low plasma levels of testosterone and IGF-I compared to healthy individuals of a similar age. However, the correlation between body weight or muscle mass and plasma levels of these hormones is weak.
The prevalence of muscle wasting in COPD patients can only be estimated because there are no simple techniques to measure muscle mass. One study found that reduced body weight was reported in up to 49% of 253 patients with COPD undergoing pulmonary rehabilitation. However, the actual prevalence of muscle wasting is likely underestimated when using body weight measurements because lean body mass, an indicator of muscle mass, may be reduced despite a stable body weight. This conclusion is supported by data showing a significantly greater reduction in thigh muscle cross-sectional area than body weight, indicating a preferential loss of muscle tissue in emaciated patients with COPD.
Low muscle mass in COPD patients is associated with weaker peripheral muscles, impaired functional status, and poor health-related quality of life. The reduction in peripheral muscle mass and strength is comparable in COPD, suggesting that the remaining contractile apparatus is functionally preserved. This may not hold for patients frequently exposed to systemic corticosteroids, where the loss of strength may be disproportionate to the reduction in muscle mass.
The best available therapeutic approach to preserve muscle mass is strength training, as physical activity can reduce proteasome activity. Anabolic steroid and growth hormone supplementation have been disappointing so far, but the doses used were likely subtherapeutic. Further studies are needed to determine the optimal dosage of these anabolic hormones, and their use should be studied in conjunction with exercise training as synergy may be observed.
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Muscle wasting is caused by muscle weakening and shrinking
Peripheral muscle wasting is a common occurrence in advanced chronic obstructive pulmonary disease (COPD) and several other chronic diseases. It is a form of muscle atrophy, or muscle wasting, which is caused by muscle weakening and shrinking.
Muscle atrophy can be caused by the disuse of muscles or neurogenic conditions. Physiologic atrophy, or disuse atrophy, is caused by not using muscles enough. This can be due to a sedentary lifestyle, malnutrition, lack of exercise, or being bedridden. When muscles are not in use, the body conserves energy by breaking them down, resulting in a decrease in muscle size and strength. This type of atrophy can often be reversed with exercise and improved nutrition.
Neurogenic atrophy, on the other hand, is caused by nerve problems or diseases that affect the nerves connecting to the muscles. When these nerves are damaged, they cannot trigger the muscle contractions needed for muscle activity, leading to muscle wasting.
Muscle wasting can also be caused by certain medical conditions, such as amyotrophic lateral sclerosis (ALS), muscular dystrophy, multiple sclerosis (MS), and spinal muscular atrophy. These conditions can lead to progressive muscle weakness and wasting. Additionally, malnutrition can contribute to muscle wasting due to inadequate nutritional intake, which can be caused by various factors such as anorexia nervosa, cancer, or persistent nausea.
The treatment for muscle wasting depends on the underlying cause. Exercise and proper nutrition are crucial in preventing and treating muscle wasting. Doctors may recommend specific exercises or physical therapy, and in some cases, ultrasound therapy or surgery may be suggested. Addressing any underlying medical conditions is also essential to prevent further muscle atrophy.
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Malnutrition can cause muscle wasting
Peripheral muscle wasting is a common occurrence in advanced chronic obstructive pulmonary disease (COPD) and several other chronic diseases. It is associated with weaker peripheral muscles, impaired functional status, and poor health-related quality of life.
Malnutrition is a state of inadequate nutritional intake, which can cause muscle loss, leading to muscle wasting. It is one of the main risk factors for skeletal muscle loss and is included in the diagnostic criteria for malnutrition. Malnutrition can lead to changes in body composition, resulting in functional impairment and poor clinical outcomes. It is a major independent risk factor for the reduction of muscle cross-sectional area (CSA) and strength.
In a study of older hospitalized patients, malnourished individuals lost 10% of handgrip strength and 12% of knee extension strength during their hospital stay. Their mean mid-thigh muscle CSA also declined by 7.0 cm2, or 9%, while that of non-malnourished patients remained relatively stable. Furthermore, malnutrition was significantly and independently associated with acute muscle wasting in frail older patients during a 2-week hospitalization.
The impact of malnutrition on muscle wasting is particularly evident in older individuals. Ageing and disease both result in a progressive decrease in muscle mass, which can limit independence. Older adults with lower muscle strength and mass are at a higher risk of developing geriatric conditions, including malnutrition, falls, and functional disabilities. Thus, malnutrition, when combined with physical inactivity, not only contributes to muscle wasting but may also adversely affect muscle strength and physical functioning in the upper and lower extremities of older individuals.
To prevent and treat muscle wasting, proper nutrition is essential. A diet providing sufficient calories, protein, and other nutrients that promote muscle development can help address muscle wasting.
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Neurogenic atrophy is caused by nerve problems or diseases
Peripheral muscle wasting, also known as muscle atrophy, is the wasting or thinning of muscle mass. It can be caused by the disuse of muscles or neurogenic conditions. Neurogenic atrophy is a type of muscle atrophy that 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 necessary for muscle activity. As a result, the muscles don't contract, and the body breaks them down, leading to a decrease in size and strength.
Neurogenic atrophy can be caused by various nerve problems or diseases, including:
- Amyotrophic lateral sclerosis (ALS): This is a progressive disease that affects nerve cells throughout the body, leading to motor weakness and muscle atrophy.
- Guillain-Barre syndrome: This syndrome damages nerves, causing muscle weakness and, in some cases, paralysis.
- Carpal tunnel syndrome: This condition compresses the median nerve in the wrist, leading to numbness and muscle weakness in the hand and arm.
- Spinal cord injuries: Damage to the spinal cord can result in nerve damage, causing muscle atrophy and loss of function below the level of the injury.
- Multiple sclerosis (MS): MS is an autoimmune disease that damages the myelin surrounding nerve fibers, affecting their ability to trigger muscle movement and leading to atrophy.
The time it takes for neurogenic atrophy to develop depends on the individual's health condition, age, and fitness level. Unlike disuse atrophy, neurogenic atrophy typically cannot be reversed due to the physical damage caused to the nerves. However, treatments such as electrical stimulation and ultrasound therapy can help maintain muscle mass and promote healing.
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Muscular dystrophy is a genetic condition that leads to muscle wasting
Peripheral muscle wasting is a common occurrence in advanced chronic obstructive pulmonary disease (COPD) and several other chronic diseases. It refers to the loss of muscle mass due to muscle weakening and shrinking. While there is currently no effective treatment for peripheral muscle wasting, research in molecular biology has improved our understanding of how muscle mass is maintained.
Muscular dystrophy is a group of more than 30 genetic conditions that lead to progressive muscle weakness and muscle wasting. It is caused by mutations in the genes responsible for maintaining healthy muscle structure and function. These mutations prevent the cells from fulfilling their role, resulting in muscle degeneration and weakness. The symptoms of muscular dystrophy vary and can be present at birth, develop in childhood, or manifest in adulthood. They include progressive muscle weakness, muscle wasting, and in some cases, heart conditions.
There are several types of muscular dystrophy, including Duchenne muscular dystrophy (DMD), which is the most common form in childhood. DMD is caused by an absence of the muscle protein dystrophin and primarily affects boys. Other types include myotonic dystrophy, facioscapulohumeral (FSHD), and congenital MD. The symptoms of FSHD typically begin in the teenage years and often affect the face, shoulders, and upper arms. Congenital MD causes muscle weakness that worsens over time, leading to disability.
The diagnosis of muscular dystrophy involves various tests, such as creatine kinase blood tests, genetic tests, muscle biopsies, and electromyography (EMG). While there is currently no cure for muscular dystrophy, treatments focus on managing symptoms and improving quality of life. These treatments include physical and occupational therapies, corticosteroids, and gene therapy. Researchers are actively working towards finding a cure and improving treatment options.
In summary, peripheral muscle wasting is a condition characterised by the loss of muscle mass and is commonly associated with chronic diseases such as COPD. Muscular dystrophy is a genetic condition that contributes to peripheral muscle wasting by causing progressive muscle weakness and degeneration. The symptoms and treatment options for muscular dystrophy vary, and researchers are continuously working to improve patient outcomes.
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Frequently asked questions
Peripheral muscle wasting is the loss of muscle mass in the arms and legs. It is often caused by a lack of physical activity, but it can also be caused by malnutrition, age, genetics, or certain medical conditions.
Symptoms of peripheral muscle wasting include a decrease in muscle mass, limbs appearing smaller than normal, weakness, numbness, and tingling in the arms and legs.
Peripheral muscle wasting is diagnosed through a physical examination and a review of medical history. A doctor may also order additional tests, such as blood tests, muscle or nerve biopsies, and imaging scans.
Yes, peripheral muscle wasting can often be treated through exercise, physical therapy, and nutritional interventions. In some cases, surgery may be necessary.
Peripheral muscle wasting has a variety of causes, including muscular dystrophy, multiple sclerosis, amyotrophic lateral sclerosis (ALS), and certain autoimmune conditions. It is also commonly associated with chronic obstructive pulmonary disease (COPD).
