Logan Steele
Muscle loss, or muscle atrophy, is the thinning or loss of muscle tissue and muscle mass. This loss of muscle can cause a decrease in strength and movement. Muscle atrophy can be caused by a variety of factors, including disuse, aging, malnutrition, nerve damage, and certain diseases. The rate of muscle atrophy varies between individuals, but it can progress rapidly, with up to 0.5-0.6% of muscle mass lost per day in cases of disuse. Sarcopenia, a type of muscle atrophy, is specifically associated with aging and can be slowed by exercise. Treatment for muscle atrophy typically includes lifestyle changes, such as physical activity and a healthy diet, and in some cases, medical intervention may be required.
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Muscle atrophy
There are three types of muscle atrophy: physiologic, pathologic, and neurogenic. Physiologic atrophy, also known as disuse atrophy, is caused by not using muscles enough. This can be due to leading a sedentary lifestyle, having health problems that limit movement, or not getting enough exercise. Physiologic atrophy is often reversible with exercise and improved nutrition.
Pathologic atrophy is associated with aging, starvation, and diseases such as Cushing's disease, which can be caused by the over-administration of corticosteroids or an overactive adrenal gland. Aging-related pathologic atrophy is also known as sarcopenia, which specifically affects older people and progresses faster than regular muscle atrophy.
Neurogenic atrophy is the most severe form of muscle atrophy and is caused by injuries or diseases that affect the nerves connected to the muscles. Conditions that can lead to neurogenic atrophy include amyotrophic lateral sclerosis (ALS), carpal tunnel syndrome, multiple sclerosis, and spinal cord injuries. When these nerves are damaged, they cannot trigger the muscle contractions needed to stimulate muscle activity, leading to muscle wastage.
The symptoms of muscle atrophy include muscle weakness, loss of movement, and a decrease in muscle size. These symptoms can vary depending on the cause and severity of the muscle loss. Muscle atrophy can be treated through lifestyle changes, physical therapy, and in some cases, surgery. Exercise, particularly strength training, is an effective way to rebuild muscle mass and reverse the effects of muscle atrophy.
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Sarcopenia
The risk of sarcopenia is increased by inactivity and a poor diet, which can also lead to obesity. When a person has both conditions, it is called sarcopenic obesity. Obesity appears to worsen sarcopenia, as high levels of body fat increase inflammation and change how the body responds to insulin, which can speed up muscle loss. Obesity can also make it harder to stay active, leading to a cycle of muscle loss and fat accumulation.
Chronic diseases can also increase the risk of sarcopenia. These include chronic obstructive pulmonary disease (COPD), kidney disease, diabetes, cancer, and HIV. In addition, hormonal changes that occur with ageing, such as lower concentrations of testosterone and insulin-like growth factor, are thought to play a role in the development of sarcopenia.
While sarcopenia is currently incurable, it can be treated and even reversed. Treatment includes lifestyle changes, such as progressive resistance-based strength training and eating a healthy diet with adequate protein.
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Neurogenic atrophy
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 the most severe type of muscle atrophy. It is caused by an injury or disease affecting nerves that connect to the muscles. When these nerves are damaged, they cannot trigger the muscle contractions that are needed to stimulate muscle activity. When the muscles don't contract, the body thinks they are no longer needed and starts breaking them down, causing a decrease in size and strength. This type of atrophy tends to occur more suddenly than physiologic atrophy.
- Amyotrophic lateral sclerosis (ALS) or Lou Gehrig's disease
- Guillain-Barre syndrome
- Carpal tunnel syndrome
- Spinal cord injury
- Multiple sclerosis
The amount of time it takes for muscles to atrophy depends on age, fitness level, and the cause of atrophy. Neurogenic atrophy may develop sooner depending on the individual's health condition. The condition can be diagnosed through a physical exam, blood tests, muscle or nerve biopsies, and imaging scans such as MRI or CT scans.
Treatment for neurogenic atrophy can be challenging due to the physical damage to the nerves. While physiologic atrophy can often be reversed with exercise and improved nutrition, neurogenic atrophy typically cannot be reversed. However, physical therapy, ultrasound therapy, and in some cases, surgery, may be recommended as part of a treatment plan to help manage the condition and improve functional status and quality of life.
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Physiologic atrophy
Muscle atrophy is the wasting or thinning of muscle mass. It can be caused by the disuse of muscles or neurogenic conditions. Physiologic atrophy, or disuse atrophy, is muscle atrophy caused by insufficient muscle use. This type of atrophy is often reversible with exercise and better nutrition.
People with seated jobs, health problems that limit movement, or decreased activity levels are more likely to be affected by physiologic atrophy. The process of muscle atrophy can begin within two to three weeks of not using the muscles. This can be due to leading a sedentary lifestyle, malnutrition, or a lack of exercise. It can also be caused by being on bed rest, having a genetic disorder, or having health problems that limit movement.
The hallmark sign of muscle atrophy is the loss of lean muscle mass. This change may be difficult to detect due to obesity, changes in fat mass, or edema. The predominant symptom of muscle atrophy is increased weakness, which may result in difficulty or inability in performing physical tasks depending on which muscles are affected. For example, atrophy of the throat muscles may cause difficulty swallowing, and diaphragm atrophy can cause difficulty breathing.
The treatment for muscle atrophy depends on the underlying cause but often includes exercise and adequate nutrition. Anabolic agents may be effective but are not often used due to side effects. There are multiple treatments and supplements under investigation, but there are currently limited treatment options in clinical practice. Given the implications of muscle atrophy and limited treatment options, minimizing immobility is critical in cases of injury or illness.
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Pathologic atrophy
Muscle atrophy is the wasting or thinning of muscle mass. It is the loss of muscle tissue and can be caused by muscle disuse or neurogenic conditions. There are three types of muscle atrophy: physiologic, pathologic, and neurogenic.
Neurogenic atrophy results from nerve damage that inhibits muscle contractions and stimulation. When muscles do not contract, they are broken down by the body, causing a decrease in size and strength. This type of atrophy can be caused by various diseases and conditions, including Amyotrophic Lateral Sclerosis (ALS), Guillain-Barre Syndrome, carpal tunnel syndrome, spinal cord injuries, and multiple sclerosis.
Physiologic atrophy, on the other hand, is caused by not using the muscles enough. It can be reversed with exercise and better nutrition. People with seated jobs, health problems that limit movement, or decreased activity levels are most at risk for physiologic atrophy.
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Frequently asked questions
Muscle loss is when a person's muscle does not work or move normally. The medical term for the complete loss of muscle function is paralysis. The partial loss of muscle function is called paresis.
Muscle atrophy is the loss of skeletal muscle mass or muscle tissue. It can be caused by the disuse of muscles, neurogenic conditions, or nerve damage. It can also be caused by an imbalance between protein synthesis and protein degradation.
Sarcopenia is a type of muscle atrophy that is age-related and specifically affects people as they grow older. It is the degenerative loss of skeletal muscle mass, quality, and strength. Sarcopenia can be slowed by exercise and a healthy diet.
Cachexia is a wasting syndrome caused by an underlying disease such as cancer, congestive heart failure, or chronic kidney disease. It causes dramatic muscle atrophy and cannot be completely reversed with nutritional therapy.
