Logan Steele
Muscle wastage, or atrophy, is the wasting or loss of muscle tissue and mass. It is caused by a lack of physical activity, nerve problems, or underlying health conditions. Symptoms include a decrease in muscle mass, muscle weakness, and numbness or tingling in the limbs. Muscle wastage can often be reversed with exercise, physical therapy, and proper nutrition.
| Characteristics | Values |
|---|---|
| Definition | Wasting, thinning, or loss of muscle mass or tissue |
| Other Names | Muscle atrophy, muscle wasting |
| Symptoms | Decrease in muscle mass, one limb being smaller than the other, weakness, numbness, tingling, difficulty swallowing or speaking, difficulty standing from a seated position, walking, climbing stairs, etc. |
| Causes | Lack of physical activity, nerve problems or diseases, malnutrition, aging, medications, immobility, genetic disorders, muscular dystrophy, Charcot-Marie-Tooth disease, stroke, etc. |
| Diagnosis | Physical examination, blood tests, muscle or nerve biopsy, electromyography (EMG), nerve conduction studies, CT scans, MRI scans, etc. |
| Treatment | Exercise, healthy diet, ultrasound therapy, surgery, nutritional therapy, anabolic agents, etc. |
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What You'll Learn
- Muscle atrophy types: physiologic, pathologic, and neurogenic
- Causes: aging, malnutrition, nerve damage, immobility, disease
- Symptoms: loss of muscle mass, weakness, difficulty swallowing
- Diagnosis: physical exam, blood test, muscle biopsy, EMG, CT scan
- Treatment: exercise, nutrition, ultrasound therapy, surgery
Muscle atrophy types: physiologic, pathologic, and neurogenic
Muscle atrophy is the wasting or thinning of muscle mass. It can be caused by muscle disuse, nerve damage, aging, malnutrition, medications, or a wide range of injuries or diseases that impact the musculoskeletal or nervous system. There are three types of muscle atrophy: physiologic, pathologic, and neurogenic.
Physiologic atrophy, or disuse atrophy, occurs when muscles aren't used enough due to a sedentary lifestyle, health problems that limit movement, or decreased activity levels. It can also be caused by malnourishment or aging. This type of atrophy can often be reversed 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 overuse of corticosteroids or having overactive adrenal glands. It can also be caused by certain systemic diseases, such as cancer, congestive heart failure, chronic obstructive pulmonary disease, AIDS, and liver disease.
Neurogenic atrophy is the most severe type of muscle atrophy. It occurs when there is a disruption of nerve signals to the muscles due to nerve damage or diseases that affect the nerves connecting to the muscles. Examples of diseases that can cause neurogenic atrophy include Amyotrophic Lateral Sclerosis (ALS) and carpal tunnel syndrome. This type of atrophy tends to occur more suddenly than physiologic atrophy and can lead to involuntary muscle twitching or muscle spasticity.
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Causes: aging, malnutrition, nerve damage, immobility, disease
Muscle atrophy, or muscle wastage, is the wasting or thinning of muscle mass. It can be caused by several factors, including aging, malnutrition, nerve damage, immobility, and disease.
Aging
Muscle atrophy can occur as a natural part of the aging process, with conditions such as sarcopenia, a form of muscle degeneration, becoming more common with age. The risk of muscle wastage increases with age due to a reduction in the body's production of proteins that promote muscle growth. This leads to muscle cells shrinking and a decrease in overall muscle mass and strength.
Malnutrition
Inadequate nutrition is another contributing factor to muscle wastage. Diets lacking sufficient calories, protein, fruits, and vegetables can impair muscle growth and maintenance. Malnutrition-related muscle atrophy may also develop as a result of medical conditions that impair the body's ability to absorb nutrients. For example, cachexia, a complex metabolic condition, causes extreme weight loss and muscle atrophy and is often a symptom of underlying conditions such as cancer or HIV.
Nerve Damage
Neurogenic atrophy, or nerve damage, is another cause of muscle wastage. Diseases and conditions such as amyotrophic lateral sclerosis (ALS), multiple sclerosis, and carpal tunnel syndrome can affect the nerves that control muscles, resulting in muscle atrophy. When these nerves are damaged, they can no longer trigger the muscle contractions necessary for muscle activity, leading to a decrease in muscle mass and strength.
Immobility
Low physical activity and immobility are significant contributors to muscle wastage. Disuse atrophy occurs when muscles are not used enough, causing the body to break down muscle tissue to conserve energy. This can happen during periods of inactivity, such as recovery from an illness or injury, or as a result of a sedentary lifestyle. However, disuse atrophy can often be reversed through regular exercise and physical therapy.
Disease
Various diseases and chronic conditions can also lead to muscle wastage. For example, muscular dystrophy is a group of progressive conditions that cause loss of muscle mass and weakness. Additionally, certain medical conditions can impair the body's ability to absorb nutrients, leading to malnutrition-related muscle atrophy. In some cases, muscle wastage may be a symptom of an underlying disease, such as cancer or HIV.
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Symptoms: loss of muscle mass, weakness, difficulty swallowing
Muscle wastage, or muscle atrophy, is the wasting or thinning of muscle mass. It can be caused by disuse of muscles or neurogenic conditions. Symptoms of muscle atrophy include a decrease in muscle mass, weakness, and difficulty swallowing.
Muscle atrophy can occur due to malnutrition, age, genetics, a lack of physical activity, or certain medical conditions. Disuse atrophy happens when muscles are not used enough, while neurogenic atrophy occurs due to nerve problems or diseases. Disuse atrophy can be caused by leading a sedentary lifestyle, having a stroke, or age-related atrophy. Neurogenic atrophy can be caused by an injury or disease affecting the nerves that connect to the muscles.
The symptoms of muscle atrophy differ depending on the cause. The most obvious sign is reduced muscle mass, with one limb sometimes appearing smaller than the other. Other symptoms include weakness in one arm or leg, numbness or tingling in the limbs, trouble walking or balancing, and difficulty swallowing or speaking. If muscle atrophy occurs in the face or throat, it may cause facial weakness and difficulty speaking or swallowing.
To diagnose muscle atrophy, a healthcare provider will perform a physical exam and ask about the patient's symptoms. They will measure the patient's muscle mass and may order additional tests such as blood tests, muscle or nerve biopsies, and imaging scans. Treatment for muscle atrophy caused by disuse typically involves exercise and a healthy diet. Physiotherapy and ultrasound therapy may also be recommended.
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Diagnosis: physical exam, blood test, muscle biopsy, EMG, CT scan
Muscle wastage, or muscle atrophy, is the wasting or thinning of muscle mass. It can be caused by disuse of muscles, neurogenic conditions, malnutrition, age, genetics, or a lack of physical activity. Symptoms of muscle atrophy include a decrease in muscle mass, weakness or numbness in the limbs, and trouble with balance or swallowing.
To diagnose muscle atrophy, a healthcare provider will typically perform a physical exam and ask about symptoms. They will also measure the muscle mass in the arms and legs. In addition, they may order the following tests:
Blood test
Blood tests can be used to check creatine kinase (CK) levels, which can indicate the presence of muscle damage. CK is an enzyme normally found in muscles, but it can leak into the blood following muscle damage. While raised levels of CK can point towards muscle damage, this test alone cannot provide a conclusive diagnosis, as other factors such as intense physical exercise can also lead to increased CK levels.
Muscle biopsy
A muscle biopsy involves inserting a needle into the muscle to extract a tissue sample for examination. If a larger sample is required, a small incision may be made in the skin, and sharp scissors can be used to cut sections of muscle tissue. A muscle biopsy can help determine the source of any abnormalities and ensure proper treatment.
Electromyography (EMG)
EMG is a technique used to detect voltage changes or polarity changes that occur across the muscle fibre membrane. These voltage changes are necessary for the muscle to become active and produce force. EMG can be used to determine if a muscle is "on" or "off", and can also provide information on the volume, amplitude, frequency, and latency of the signal.
Computed tomography (CT) scan
CT scans provide detailed images of any part of the body, including bones, muscles, fat, and organs. They offer greater clarity and detail than standard X-rays and can help visualise the placement of needles during biopsies or the aspiration of fluid from the chest. CT scans can be performed with or without contrast, which involves ingesting or injecting a substance to make certain organs or tissues appear more clearly.
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Treatment: exercise, nutrition, ultrasound therapy, surgery
Muscle atrophy, or muscle wasting, is the loss or thinning of muscle mass. It can be caused by disuse of muscles, neurogenic conditions, malnutrition, age, genetics, lack of physical activity, or certain medical conditions. Treatment for muscle atrophy depends on the type and underlying cause.
Exercise
Disuse atrophy can be reversed with regular exercise, which helps to slow down muscle loss, enhance strength and mobility, and improve overall physical functionality. Moderate-intensity aerobic activities and low-to-moderate strength training can improve overall fitness. Working out in the water, such as exercises in the pool, can reduce muscle workload. Even if you can't move certain joints, you can still exercise with the support of a splint or brace. Before starting any exercise program, it is important to consult a doctor or physiotherapist.
Nutrition
A healthy diet and proper nutrition are crucial in treating disuse atrophy. A healthcare provider may recommend working with a dietitian to develop a healthy eating plan, which may include nutritional supplements. Malnutrition can lead to muscle atrophy, so addressing nutritional deficiencies is essential.
Ultrasound Therapy
Ultrasound therapy is a treatment option for neurogenic atrophy, which is caused by nerve problems or diseases. Ultrasound therapy uses sound waves to promote muscle healing.
Surgery
In cases of severe muscle atrophy, surgery may be required. If an individual develops a contracture, a condition where muscle tissues become fibrous and prevent movement, surgery can be performed to correct it.
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