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Muscle wasting, or atrophy, is the thinning or loss of muscle tissue and mass. It is usually caused by a lack of physical activity or exercise, and it can be reversed with a proper diet, exercise, or physical therapy. Muscle atrophy can also be caused by malnutrition or nerve problems, and it may be a symptom of another underlying health condition. As people age, they lose muscle mass, and this process can be accelerated by certain diseases.
| Characteristics | Values |
|---|---|
| Definition | Wasting or thinning of muscle mass |
| Other Names | Muscle atrophy, muscle wasting |
| Symptoms | Decrease in muscle mass, one limb being smaller than the other, weakness, numbness, and tingling in the limbs, trouble walking or balancing, difficulty swallowing or speaking |
| Causes | Lack of physical activity, malnutrition, nerve problems or diseases, genetic factors, aging, underlying health conditions |
| Treatments | Exercise, healthy diet, physical therapy, ultrasound therapy, surgery, anabolic steroids, dietary supplements, adequate nutrition, focused ultrasound therapy |
| Prevention | Exercise, proper nutrition |
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What You'll Learn
Muscle atrophy is caused by inactivity, illness, or injury
Muscle atrophy, or muscle wasting, is the thinning or wasting of muscle mass. It is caused by inactivity, illness, or injury. When a person is unable to move due to an injury or underlying health condition, muscle wasting can occur. This is because the body no longer needs to waste energy taking care of those muscles and so it starts to break them down, resulting in a decrease in size and strength. This can also happen to astronauts after a few days of weightlessness.
Disuse atrophy, or physiologic atrophy, is caused by a sedentary lifestyle, malnutrition, or lack of exercise. It can also be caused by being bedridden, having certain genetic disorders, or age-related atrophy. The process of muscle atrophy can begin within two to three weeks of muscle disuse. It is important to note that disuse atrophy can be reversed with exercise and a healthy diet.
Neurogenic atrophy is caused by an injury or disease that affects the nerves connecting to the muscles. When these nerves are damaged, they cannot trigger the muscle contractions needed to stimulate muscle activity. Neurogenic atrophy may develop sooner depending on the individual's health condition.
To diagnose muscle atrophy, a healthcare provider will perform a physical exam and ask about symptoms. They will also look at the patient's arms and legs and measure muscle mass. Further tests may be ordered, such as blood tests, muscle or nerve biopsies, and imaging scans.
Preventing and treating muscle atrophy involves a combination of medical interventions, physical therapy, and lifestyle changes. Certain exercises can be incorporated to maintain muscle strength and function, even during periods of restricted mobility. It is important to consult a healthcare professional before starting any exercise program.
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Malnutrition and ageing cause muscle wasting
Muscle wasting, or muscle atrophy, is the thinning or loss of muscle tissue. It can be caused by various factors, including malnutrition and ageing.
Ageing is a common cause of muscle wasting. Sarcopenia, a type of muscle atrophy, is an age-related condition characterised by the progressive loss of muscle mass and strength. The rate of muscle loss varies, but individuals with sarcopenia may lose up to 8% of their muscle mass per decade. The condition primarily affects older individuals, with rates ranging from 5% to 13% in people aged 60 and above, and increasing to 11% to 50% in those aged 80 and older. Sarcopenia can significantly impact an individual's quality of life, reducing their ability to perform daily tasks and decreasing their lifespan.
As people age, their bodies undergo changes that contribute to the development of sarcopenia. One key factor is a decrease in protein synthesis, resulting in smaller muscle cells. Additionally, age-related changes in hormone levels, such as testosterone and insulin-like growth factor (IGF-1), can affect muscle fibres and lead to sarcopenia.
Malnutrition is another significant factor contributing to muscle wasting. Recent definitions of malnutrition include low muscle mass as a diagnostic criterion. Prolonged stays in intensive care units (ICUs), often required for COVID-19 patients, can directly worsen or cause malnutrition, leading to severe muscle loss and functional decline. Malnutrition in older adults, especially when combined with ageing-related factors, can further exacerbate muscle wasting.
Both ageing and malnutrition result in a progressive decrease in muscle mass. This loss of muscle tissue, or atrophy, can be addressed through interventions such as physical exercise and improved nutrition. Resistance exercises, such as using resistance bands or lifting weights, are particularly effective in preventing and reversing muscle wasting. Additionally, ensuring adequate calorie and protein intake can help slow down the rate of muscle loss.
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Genetic conditions can lead to muscle wasting
Muscle wasting, or muscle atrophy, is the thinning or loss of muscle tissue. It can occur when muscles are not used enough, causing a decrease in muscle mass and strength. Physiologic atrophy can often be reversed with exercise and better nutrition.
Another example of a genetic condition causing muscle wasting is spinal muscular atrophy. This disease is similar to muscular dystrophy and is caused by a loss of motor neurons, leading to muscle weakness. Multiple sclerosis (MS), an autoimmune disease affecting the nerves, can also cause muscle wasting.
In addition to genetic conditions, other factors contributing to muscle wasting include malnutrition, aging, nerve injuries or diseases, and various illnesses such as heart failure, sepsis, and cancer. Treatment for muscle wasting may include physical therapy, ultrasound therapy, and surgery. Exercise and proper nutrition are crucial in preventing and treating muscle wasting.
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Neurogenic atrophy is caused by nerve damage
Muscle atrophy is the wasting or thinning of muscle mass. It can be caused by disuse of muscles, malnutrition, age, genetics, or neurogenic conditions. Neurogenic atrophy is a type of muscle atrophy caused by nerve damage. When nerves that connect to the muscles are damaged, they cannot trigger the muscle contractions necessary for muscle activity. As a result, the muscles atrophy due to a lack of stimulation.
Neurogenic atrophy is typically caused by an injury or disease affecting the nerves that connect to the muscles. Examples of diseases that can cause neurogenic atrophy include amyotrophic lateral sclerosis (ALS), multiple sclerosis (MS), carpal tunnel syndrome, and spinal cord injuries. These diseases damage the motor nerve cells that control the muscles, resulting in muscle atrophy. The symptoms of neurogenic atrophy include reduced muscle mass, muscle weakness, numbness or tingling in the limbs, and difficulty with walking or balancing.
The treatment for neurogenic atrophy depends on the underlying cause and the severity of the condition. In some cases, medications may be prescribed to manage the underlying neurological condition. Surgery may also be required to repair damaged nerves or tissues. Physical therapy and exercise can help improve muscle strength and mobility, but neurogenic atrophy typically cannot be reversed due to the physical nerve damage.
The time it takes for neurogenic atrophy to develop depends on the individual's health condition. It tends to occur more suddenly than physiologic atrophy, which is caused by disuse of muscles. Neurogenic atrophy may develop within two to three weeks, but this varies depending on age, fitness level, and the specific cause of the atrophy.
It is important to seek medical advice if you are experiencing any symptoms of muscle atrophy, as early treatment can help prevent or slow down significant muscle loss and improve quality of life.
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Treatments include exercise, nutrition, and therapy
Muscle wasting, or atrophy, is the thinning or loss of muscle tissue and mass. It is caused by the disuse of muscles or neurogenic conditions. Symptoms include a decrease in muscle mass, weakness and tingling in the limbs, and numbness. In some cases, muscle wasting can be reversed, but it may take time. When it is not reversible, treatment can slow the loss of muscle.
Exercise
Exercise is one of the main ways to treat muscle wasting. The type of exercise recommended by doctors will depend on the cause of atrophy. For instance, certain underlying conditions may limit specific exercises. A healthcare provider may recommend exercises in a swimming pool to reduce the muscle workload. People who cannot actively move one or more joints can do exercises using braces or splints.
Nutrition
Nutrition is important in treating muscle wasting. A diet that provides sufficient calories, protein, and other nutrients that promote muscle development may help treat muscle wasting. Nutritional supplements may be recommended.
Therapy
Therapy can help prevent further muscle wasting. Physical therapy involves performing specific stretches and exercises to prevent immobility. Functional electrical stimulation (FES) is another effective treatment for muscle atrophy. It involves using electrical impulses to stimulate muscle contraction. Ultrasound therapy is a relatively new treatment for muscle wasting that involves directing beams of high-frequency sound waves at specific areas of the body to stimulate muscle contraction.
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Frequently asked questions
Muscle wasting, or atrophy, is the wasting or thinning of muscle mass. It can be caused by the disuse of muscles, neurogenic conditions, malnutrition, age, genetics, or certain medical conditions.
Symptoms of muscle wasting include a decrease in muscle mass, limbs appearing smaller than normal, weakness, numbness, and tingling in the limbs.
Treatment for muscle wasting depends on the underlying cause but often includes exercise, adequate nutrition, and physical therapy. In some cases, ultrasound therapy or surgery may be recommended.
