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Muscle wasting syndrome, also known as muscle atrophy, is a condition that causes a decrease in muscle mass and strength. It is often caused by advancing age, physical inactivity, malnutrition, nerve damage, or muscle-related health conditions. The wasting of muscle tissue can occur gradually or rapidly, depending on the underlying cause and an individual's health condition. Symptoms of muscle wasting syndrome include reduced muscle mass, muscle weakness, numbness or tingling in the limbs, and in severe cases, difficulty with movement and daily activities. Treatment for muscle wasting syndrome aims to address the underlying cause and may include exercise, physical therapy, focused ultrasound therapy, and nutritional interventions to promote muscle development and improve strength.
| Characteristics | Values |
|---|---|
| Type | Muscle wasting syndrome, also known as muscle atrophy, has two types: disuse (physiologic) atrophy and neurogenic atrophy. |
| Causes | Disuse atrophy is caused by insufficient muscle use due to a sedentary lifestyle, malnutrition, lack of exercise, genetic disorders, or age-related atrophy (sarcopenia). Neurogenic atrophy is caused by nerve problems or diseases, such as injuries or conditions affecting nerves connected to muscles. |
| Symptoms | Decrease in muscle mass, one limb being smaller than the other, numbness, weakness, tingling in limbs, trouble walking or balancing, difficulty swallowing or speaking, muscle weakness, loss of stamina, difficulty performing daily activities, walking slowly, trouble climbing stairs, poor balance, and falls. |
| Diagnosis | Diagnosis involves a physical exam, symptom review, and specific tests like blood tests, muscle or nerve biopsies, electromyography (EMG), nerve conduction studies, CT scans, and MRI scans. |
| Treatment | Treatment includes exercise, a healthy diet, and focused ultrasound therapy. For sarcopenia, progressive resistance-based strength training and increased protein intake are recommended. |
| Related Conditions | Related conditions include muscular dystrophy, multiple sclerosis, amyotrophic lateral sclerosis (ALS), spinal muscular atrophy, carpal tunnel syndrome, and various chronic illnesses such as cancer, chronic kidney disease, heart failure, and HIV. |
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What You'll Learn
Muscle atrophy and its causes
Muscle atrophy, also known as muscle wasting, is the thinning or decrease in size of muscle tissue and loss of muscle mass. It is usually caused by a lack of physical activity or disuse of muscles, leading to a decrease in muscle strength. This can be due to a sedentary lifestyle, old age, or underlying health conditions that limit movement, such as a stroke or osteoarthritis.
Disuse or physiologic atrophy occurs when muscles are not used enough, and the body starts breaking them down. This can be caused by a lack of exercise, leading a sedentary lifestyle, or being bedridden. It can also be caused by malnutrition or malnourishment. Physiologic atrophy can often be reversed with exercise and improved nutrition.
Neurogenic atrophy 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, leading to muscle wasting. Diseases that can cause neurogenic atrophy include amyotrophic lateral sclerosis (ALS), also known as Lou Gehrig's disease, dermatomyositis, and Guillain-Barré syndrome.
Pathologic atrophy is associated with aging, starvation, and diseases such as Cushing's disease, which is caused by the over-use of corticosteroids or overactive adrenal glands.
Sarcopenia is a type of muscle atrophy caused by the natural ageing process, where hormonal changes affect muscle fibres. It is characterised by a gradual loss of muscle mass, strength, and function, leading to a reduced ability to perform daily tasks.
Muscular dystrophy is another cause of muscle atrophy, where changes in genes affect the proteins needed to form healthy muscles. This results in muscle weakness and loss of muscle mass over time, impacting everyday tasks and, in some cases, requiring the use of a wheelchair.
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Malnutrition and muscle wasting
Muscle atrophy, or muscle wasting, is the loss or thinning of muscle tissue and mass. It can occur due to malnutrition, age, genetics, lack of physical activity, or certain medical conditions. Malnutrition is a significant risk factor for muscle atrophy, and the two conditions are closely linked.
Malnutrition can lead to muscle wasting through several mechanisms. Firstly, it can result in a deficiency of essential nutrients, such as proteins and vitamins, that are necessary for muscle growth and maintenance. For example, a diet lacking in protein can contribute to muscle wasting as protein is crucial for building and repairing muscle tissue. Secondly, malnutrition is often associated with a sedentary lifestyle and physical inactivity. This inactivity can lead to disuse atrophy, where the muscles are not used enough, causing the body to break down muscle tissue, resulting in a decrease in muscle size and strength.
Older adults are particularly vulnerable to the effects of malnutrition on muscle wasting. Age-related changes in hormones, such as testosterone and insulin-like growth factor (IGF-1), can affect muscle fibers and lead to sarcopenia, a type of muscle atrophy. Sarcopenia is characterized by a progressive loss of muscle mass and strength, resulting in muscle weakness, decreased functional capacity, and an increased risk of falls and fractures. Malnutrition, in combination with physical inactivity, can exacerbate muscle wasting in older individuals and negatively impact their muscle strength and physical functioning.
The impact of malnutrition on muscle wasting has been studied in hospitalized frail older patients. Research has shown that malnutrition is a significant independent risk factor for acute muscle wasting, leading to a rapid decline in muscle mass and strength during hospitalization. This highlights the importance of routine nutritional assessment and early recognition of malnutrition in this vulnerable population to prevent further muscle wasting and preserve muscle function.
Treating malnutrition and muscle wasting involves addressing dietary and nutritional deficiencies and increasing physical activity. Nutritional interventions, such as improving dietary intake and supplementing with protein, can help prevent and treat muscle wasting. Additionally, regular exercise, including progressive resistance-based strength training, can help improve muscle strength and reverse muscle loss. For individuals with disuse atrophy, a healthy diet and exercise regimen can effectively reverse the condition. However, for those with neurogenic atrophy due to nerve damage, the atrophy may be more challenging to reverse due to the physical damage to the nerves.
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Muscular dystrophy and genetics
Muscle wasting syndrome, or muscle atrophy, is the wasting or thinning of muscle mass. This can be caused by the disuse of muscles or neurogenic conditions. Muscular dystrophy is a group of diseases that cause muscles to waste and weaken over time, and it is a type of muscle atrophy.
Muscular dystrophy is caused by changes in the genes responsible for producing healthy muscles. These genes contain codes for proteins that are essential for strengthening and protecting muscle fibres. When these genes are mutated, the proteins are either not produced or are produced in a form that is unusable by the body. This leads to a weakening of the muscles and progressive disability.
There are many types of muscular dystrophy, including Duchenne, Becker, and myotonic dystrophy. The inheritance pattern for many types of muscular dystrophy is X-linked recessive, meaning the genetic change is passed from one generation to the next through the X chromosome. As males only have one X chromosome, they are more likely to be affected by the disease if one of their X chromosomes is mutated. Females, on the other hand, have two X chromosomes, so they are less likely to develop the disease as the normal copy of the chromosome can usually compensate for the mutated one. However, females can still be affected and can also be carriers of the disease, passing it on to their children.
The symptoms of muscular dystrophy vary depending on the type but often include muscle weakness, pain, and stiffness, as well as challenges with movement such as frequent falls, trouble rising from a seated position, and difficulty walking or running. The symptoms can start at any age, from childhood to adulthood, but the most common type, Duchenne muscular dystrophy, usually affects young boys.
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Age-related muscle loss
Muscle atrophy is the wasting or thinning of muscle mass. It can be caused by the disuse of muscles or neurogenic conditions. Age-related muscle atrophy is known as sarcopenia.
Sarcopenia is the age-related progressive loss of muscle mass and strength. It is a type of muscle atrophy primarily caused by the natural ageing process. Sarcopenia is characterised by muscle weakness, loss of stamina, difficulty performing daily activities, walking slowly, trouble climbing stairs, poor balance, and falls. The rate of muscle loss varies, but it is estimated that people can lose anywhere from 3% to 8% of their muscle mass per decade after turning 30, and this rate of decline is even higher after the age of 60.
The development of sarcopenia is influenced by several factors related to the ageing process. One key factor is a reduction in protein synthesis, which leads to a decrease in muscle cell size. This is partly due to a decline in the number of nerve cells that send messages from the brain to the muscles, instructing them to move. Additionally, hormonal changes, such as a decrease in testosterone and insulin-like growth factor (IGF-1), can affect muscle fibres and contribute to sarcopenia.
Lifestyle factors, such as physical inactivity and an unhealthy diet, can also play a role in the development of sarcopenia. However, it is important to note that sarcopenia is not an inevitable consequence of ageing, and there are steps that can be taken to slow down or reverse its effects. Progressive resistance-based strength training, also known as progressive resistance training (PRT), can help improve strength and rebuild muscle mass. Additionally, adopting a healthy diet with adequate protein intake can support muscle growth and improve recovery after workouts.
The diagnosis of sarcopenia typically involves a physical examination and an assessment of symptoms. Healthcare providers may use tools such as the SARC-F questionnaire, which evaluates strength, assistance with walking, rising from a chair, climbing stairs, and fall risk. Further tests, such as dual-energy X-ray absorptiometry (DEXA) or bioelectrical impedance analysis (BIA), can also be used to measure muscle mass, fat mass, and bone density.
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Treatment and prevention
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. Treatment and prevention of muscle wasting depend on the type of atrophy present.
Disuse atrophy can be caused by leading a sedentary lifestyle, malnutrition, or old age. This type of atrophy can be reversed with exercise and a healthy diet. A healthcare provider may recommend an exercise program that includes pool exercises to reduce muscle workload. They may also suggest working with a dietitian to increase protein intake through food or supplements.
Neurogenic atrophy 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. This type of atrophy cannot typically be reversed due to the physical damage that has been done to the nerves. However, it can sometimes be treated with a special kind of physical therapy called electrical stimulation.
Muscle wasting can also be caused by certain medical conditions, such as amyotrophic lateral sclerosis (ALS), multiple sclerosis (MS), muscular dystrophy, and Guillain-Barre syndrome. Treatment for muscle wasting caused by these conditions may depend on the underlying condition and should be discussed with a healthcare provider.
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Frequently asked questions
Muscle wasting, or atrophy, is the loss of muscle mass and strength, often caused by advancing age, physical inactivity, malnutrition, nerve damage, or muscle-related health conditions.
Symptoms of muscle wasting include muscle weakness, loss of stamina, difficulty performing daily activities, walking slowly, trouble climbing stairs, poor balance, and falls.
Muscle wasting can be caused by various factors, including aging, lack of physical activity, malnutrition, nerve damage, and certain medical conditions such as amyotrophic lateral sclerosis (ALS), muscular dystrophy, multiple sclerosis, or spinal muscular atrophy.
Treatment for muscle wasting depends on the underlying cause and may include exercise, physical therapy, focused ultrasound therapy, and adopting a healthy diet with sufficient calories, protein, and other nutrients to promote muscle development.
