Dominic Stone
Muscle atrophy is the thinning or loss of muscle tissue or mass. It can be caused by the disuse of muscles, neurogenic conditions, malnutrition, age, genetics, lack of physical activity, or certain medical conditions. Symptoms include a decrease in muscle mass, weakness, numbness, and tingling in the limbs. Disuse atrophy can be reversed with exercise and a healthy diet, while neurogenic atrophy is caused by nerve problems or diseases that disrupt nerve signals to the muscles. Muscle atrophy can lead to severe muscle weakness and cause difficulty in performing physical tasks, such as standing from a seated position or climbing stairs. Treatments include physical therapy, functional electric stimulation, ultrasound therapy, and in some cases, surgery.
| Characteristics | Values |
|---|---|
| Definition | Wasting or thinning of muscle mass |
| Other Names | Disuse atrophy, physiologic atrophy, neurogenic atrophy, pathologic atrophy |
| Causes | Malnutrition, age, genetics, lack of physical activity, nerve damage, nerve diseases, nerve injuries, muscle diseases, medications, musculoskeletal injuries, nervous system diseases, cancer, severe infections |
| Symptoms | Decrease in muscle mass, one limb being smaller than the other, weakness, numbness, tingling in limbs, trouble walking or balancing, difficulty swallowing or speaking, involuntary muscle twitching, muscle spasticity, difficulty breathing |
| Treatments | Physical therapy, functional electric stimulation, ultrasound therapy, surgery, medication, anabolic steroids, exercise, healthy diet, nutritional therapy, β-hydroxy β-methylbutyrate (HMB) supplementation |
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What You'll Learn
- Muscle atrophy is caused by muscle disuse, malnutrition, ageing, genetics, or medical conditions
- Physiologic atrophy occurs when muscles aren't used enough, such as during illness or a sedentary lifestyle
- Neurogenic atrophy is caused by nerve damage or disease, resulting in muscles no longer receiving signals from nerves
- Pathologic atrophy is caused by disease, cancer, severe infections, or malnutrition
- Treatments include exercise, nutrition, physical therapy, ultrasound therapy, medication, and in some cases, surgery
Muscle atrophy is caused by muscle disuse, malnutrition, ageing, genetics, or medical conditions
Muscle atrophy is the wasting or thinning of muscle mass. It can be caused by muscle disuse, malnutrition, ageing, genetics, or medical conditions.
Muscle disuse, or physiologic atrophy, occurs when muscles are not used enough. If this happens, the body will break down muscles, causing them to decrease in size and strength. This can be caused by a sedentary lifestyle, a desk job, or being bedridden. Physiologic atrophy is reversible with exercise and a healthy diet.
Malnutrition can also cause muscle atrophy. This is because the body does not have the nutrients it needs to maintain muscle mass. Malnutrition can be caused by an unhealthy diet or certain medical conditions that affect nutrient absorption or intake.
Ageing is another common cause of muscle atrophy. Sarcopenia, for example, is a type of muscle atrophy that occurs due to the natural ageing process. It is characterised by a decrease in both the number and size of muscle fibres, leading to muscle weakness and a reduced ability to perform daily tasks. The risk of sarcopenia increases with age, with rates ranging from 5% to 13% in people aged 60 and older, and 11% to 50% in people aged 80 and older.
Genetics can also play a role in muscle atrophy. Certain genetic disorders, such as muscular dystrophy or Charcot-Marie-Tooth disease, can cause muscle atrophy by affecting the nerves that control muscle movement.
Finally, medical conditions can also lead to muscle atrophy. Neurogenic atrophy, for instance, 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 to stimulate muscle activity, leading to muscle wasting and thinning.
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Physiologic atrophy occurs when muscles aren't used enough, such as during illness or a sedentary lifestyle
Physiologic atrophy, or disuse atrophy, occurs when muscles aren't used enough. This can be due to a sedentary lifestyle, a desk job, bed rest, or a period of immobility due to illness or injury. Physiologic atrophy can also be caused by malnutrition or a lack of exercise.
When muscles are not used, the body stops wasting energy on maintaining them, and the muscles begin to break down, resulting in a decrease in muscle size and strength. This process can begin within two to three weeks of muscle disuse.
Physiologic atrophy is distinct from neurogenic atrophy, which is caused by nerve problems or diseases that disrupt nerve signals to the muscles. Neurogenic atrophy can be caused by peripheral neuropathy, spine disease, conditions affecting the brain, or injuries that damage the nerves that control the muscles.
Treatment for physiologic atrophy typically involves regular exercise and improved nutrition. A healthcare provider may recommend physical therapy or an exercise plan, which can include pool exercises. In some cases, a healthy diet and nutritional supplements may be suggested.
It is important to note that muscle atrophy can also be caused by certain medical conditions, genetic factors, age, and inflammation. The treatment for muscle atrophy depends on the underlying cause and the degree of muscle loss.
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Neurogenic atrophy is caused by nerve damage or disease, resulting in muscles no longer receiving signals from nerves
Muscle atrophy is the wasting or thinning of muscle mass. It can be caused by the disuse of muscles, malnutrition, age, genetics, a lack of physical activity, or certain medical conditions.
Neurogenic atrophy is a type of muscle atrophy caused by nerve damage or disease, resulting in muscles no longer receiving signals from nerves. When these nerves are damaged, they cannot trigger the muscle contractions necessary for muscle activity. This can be caused by an injury or conditions that affect the nerves connected to the muscles. Diseases that can cause neurogenic atrophy include Amyotrophic Lateral Sclerosis (ALS), Guillain-Barre Syndrome, Carpal Tunnel Syndrome, spinal cord injuries, and Multiple Sclerosis.
Neurogenic atrophy is typically not reversible due to the physical damage to the nerves. However, it can sometimes be treated with a specific type of physical therapy called electrical stimulation. Electrical stimulation involves placing electrodes on the skin over the muscles, sending small electrical impulses to the nerves and muscles, and attempting to artificially contract the muscles. Ultrasound therapy is another treatment option, using sound waves to promote muscle healing. In some cases, surgery may be required to correct contractures, fibrous tissue that makes it difficult to stretch and move the muscle.
The symptoms of neurogenic atrophy include reduced muscle mass, muscle weakness, numbness or tingling in the limbs, trouble walking or balancing, and difficulty swallowing or speaking. The symptoms and severity of muscle atrophy depend on the cause and severity of the muscle loss.
It is important to note that muscle atrophy can also occur due to inactivity, malnutrition, age, genetics, or certain medical conditions. In some cases, muscle atrophy can be reversed with regular exercise, physical therapy, and a healthy diet.
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Pathologic atrophy is caused by disease, cancer, severe infections, or malnutrition
Muscle atrophy is the wasting or thinning of muscle mass. It can be caused by the disuse of muscles or neurogenic conditions. Pathologic atrophy, a type of muscle atrophy, can be caused by disease, cancer, severe infections, or malnutrition.
Diseases and chronic conditions that can contribute to pathologic atrophy include amyotrophic lateral sclerosis (ALS), multiple sclerosis (MS), arthritis, and myositis. ALS damages the motor nerve cells that control the muscles, while MS occurs when the body's immune system attacks the central nervous system, causing harmful inflammation in the nerve fibers. Arthritis refers to inflammation of the joints that cause pain and stiffness, limiting a person's mobility and potentially leading to muscle disuse and atrophy. Myositis is the inflammation of the muscles, causing muscle weakness and pain.
In addition to these diseases, severe infections such as polio can also lead to pathologic atrophy. Polio is an infectious disease that attacks the nervous system, causing flu-like symptoms and potentially resulting in permanent paralysis. Mitochondrial dysfunction is another condition that can lead to atrophy. It affects muscle tissue regulation and can lead to skeletal muscle atrophy.
Malnutrition is also a contributing factor to pathologic atrophy. This can be due to dumping syndrome, which causes malnutrition, or simply a lack of sufficient nutrition in the diet. Nutritional deficiencies can lead to muscle atrophy as the body does not receive the necessary nutrients to maintain muscle mass.
Overall, pathologic atrophy caused by disease, cancer, severe infections, or malnutrition can result in the wasting or thinning of muscle mass, requiring treatment and lifestyle changes to improve the condition.
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Treatments include exercise, nutrition, physical therapy, ultrasound therapy, medication, and in some cases, surgery
Muscle atrophy is the wasting or thinning of muscle mass. It can be caused by disuse of muscles or neurogenic conditions. Disuse atrophy occurs when muscles are not used enough, while neurogenic atrophy is caused by nerve problems or diseases. Symptoms of muscle atrophy include a decrease in muscle mass, numbness, weakness, and tingling in the limbs.
There are several treatments for muscle atrophy, including exercise, nutrition, physical therapy, ultrasound therapy, medication, and surgery. Disuse atrophy can be treated with regular exercise and a healthy diet. Working out in a pool can reduce the workload on the muscles. A healthcare provider may recommend physical therapy or an exercise plan. They may also suggest nutritional supplements.
Neurogenic atrophy can sometimes be treated with a special kind of physical therapy called electrical stimulation. In this therapy, electrodes are placed on the skin over the muscles, sending small electrical impulses to the nerves and muscles to stimulate contractions. This helps to maintain muscle mass and strength.
Ultrasound therapy is another treatment option. Ultrasound therapy uses sound waves to promote muscle healing. Focused ultrasound, a non-invasive therapeutic technology, has been investigated in preclinical research and has shown promising results in reducing muscle atrophy. However, it is not yet approved by regulatory bodies or covered by medical insurance companies.
In cases where muscle atrophy has led to contractures, surgery may be performed to correct the condition. A contracture occurs when muscle tissues become fibrous, making it difficult to stretch the muscles and restricting movement.
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Frequently asked questions
Muscle atrophy is the wasting or thinning of muscle mass. It can be caused by muscle disuse, malnutrition, age, genetics, nerve damage, or certain medical conditions.
Symptoms of severe muscle atrophy include a decrease in muscle mass, limbs appearing smaller than normal, weakness, numbness, and tingling in the limbs.
Treatment for severe muscle atrophy depends on the underlying cause and the severity of muscle loss. Treatment options may include physical therapy, functional electrical stimulation, ultrasound therapy, surgery, medication, and anabolic steroids.
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