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Muscle atrophy is the wasting or thinning of muscle mass. It can be caused by the immobility resulting from injury or illness, aging, malnutrition, medications, or a wide range of diseases that impact the musculoskeletal or nervous system. The muscle appears smaller, but not shorter, than the one that can be moved. However, it is not clear whether atrophy causes muscle shortening.
| Characteristics | Values |
|---|---|
| Definition | Wasting or thinning of muscle mass |
| Cause | Lack of physical activity, malnutrition, age, genetics, nerve problems, diseases, medications |
| Symptoms | Muscle weakness, difficulty in balancing, difficulty swallowing, difficulty breathing, disability |
| Reversibility | Can be reversed with exercise, physical therapy, surgery, and nutritional therapy |
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What You'll Learn
Malnutrition and inadequate nutrition
Muscle atrophy is the wasting or thinning of muscle mass. It can be caused by the disuse of muscles, neurogenic conditions, malnutrition, age, genetics, and certain medical conditions. Malnutrition is a leading cause of muscle atrophy, and inadequate nutrition can lead to muscle wasting and atrophy.
Malnutrition is a global issue, with poverty and a lack of understanding of nutrition being the primary causes. It can affect anyone, but certain populations are more vulnerable, including children, the elderly, and those with chronic illnesses. Malnutrition can lead to muscle atrophy by impairing the body's ability to absorb nutrients, resulting in extreme weight loss and muscle wasting. Conditions such as cachexia, which is often a symptom of underlying illnesses like cancer or HIV, can cause significant loss of appetite and unintentional weight loss despite consuming adequate calories.
Inadequate nutrition can also contribute to muscle atrophy. Diets low in lean protein, fruits, and vegetables can impair muscle growth and maintenance. Micronutrient deficiencies, such as vitamin A and vitamin D deficiencies, can have severe consequences, including vision problems, soft bones, and stunted growth in children. Additionally, malnutrition can slow cardiac activity, leading to low heart rate, low blood pressure, and low body temperature.
The treatment for malnutrition includes addressing underlying conditions, implementing diet and exercise plans, and providing long-term support systems such as counseling, behavioral therapy, and education in nutrition. Treating malnutrition can help prevent or slow down muscle atrophy.
Inactivity or disuse of muscles is another significant contributor to muscle atrophy. When muscles are not used, the body breaks them down to conserve energy, leading to a decrease in muscle size and strength. This can be a particular concern for individuals with sedentary lifestyles, desk jobs, or those who are immobile due to illness or injury. However, disuse atrophy can be reversed through regular exercise, physical therapy, and proper nutrition.
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Lack of physical activity
Muscle atrophy is the wasting or thinning of muscle mass. It is caused by the disuse of muscles or neurogenic conditions. When muscles are not contracting, the body starts breaking them down, leading to a decrease in size and strength.
The good news is that muscle atrophy due to inactivity is reversible. Regular exercise and physical therapy can help treat this form of muscle atrophy. It is important to note that the time it takes to recover from muscle atrophy depends on its type and severity. Disuse atrophy can be treated with an exercise plan and improved nutrition. Physical therapy can include specific stretches and exercises to prevent immobility and promote muscle healing. Ultrasound therapy, for example, uses sound waves to aid in muscle healing.
In addition to exercise and physical therapy, nutritional intervention may be recommended. A healthy diet and nutritional supplements can help with muscle recovery. In some cases, surgery may be necessary if tendons, ligaments, skin, or muscles are too tight and prevent movement.
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Neurogenic atrophy
Muscle atrophy refers to the wasting or thinning of muscle mass. It can be caused by muscle disuse, malnutrition, age, genetics, or certain medical conditions. One type of atrophy is neurogenic atrophy, which 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 necessary to stimulate muscle activity, leading to a decrease in muscle size and strength.
Spinal cord injuries can cause neurogenic atrophy by disrupting the nerve signals that control muscle movement. Multiple sclerosis, an autoimmune condition, can also lead to neurogenic atrophy by attacking the central nervous system and causing harmful inflammation in the nerve fibers. Muscular dystrophy, a hereditary condition, results in muscle weakness and can also contribute to neurogenic atrophy.
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Age-related atrophy
Muscle atrophy is the wasting or thinning of muscle mass, which can be caused by muscle disuse, neurogenic conditions, malnutrition, age, genetics, or certain medical conditions. Age-related muscle atrophy, also known as sarcopenia, is characterised by a reduction in the production of proteins that promote muscle growth. This decrease in protein availability causes muscle cells to shrink, resulting in a loss of muscle mass and strength.
The risk factors for age-related atrophy include cardiovascular disease, high blood pressure, diabetes, and the presence of apolipoprotein E ε4 (APOE4), the greatest genetic risk factor for Alzheimer's disease. The amount of time it takes for muscles to atrophy varies depending on age, fitness level, and the underlying cause of atrophy. Age-related atrophy can be accelerated by leading a sedentary lifestyle, malnutrition, genetic disorders such as muscular dystrophy, and certain illnesses or injuries that cause immobility.
The signs and symptoms of age-related muscle atrophy include a decrease in muscle mass, with one limb sometimes appearing smaller than the other. Other symptoms include weakness, numbness, or tingling in the limbs, difficulty with walking or balancing, and trouble swallowing or speaking. These symptoms can negatively affect an individual's quality of life, increasing the risk of injuries and impacting their ability to perform daily tasks.
The treatment for age-related atrophy aims to slow down the progression and preserve the individual's quality of life. Treatment options include physical therapy, functional electric stimulation, surgery, and targeted interventions. Regular exercise and a proper diet can help reverse muscle wastage caused by immobility, while a healthy diet rich in lean protein, fruits, and vegetables can promote muscle growth and maintenance.
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Genetic disorders
Muscle atrophy refers to the wasting or thinning of muscle mass, which can be caused by muscle disuse or neurogenic conditions. While atrophy itself does not cause muscle shortening, it can be a symptom of certain genetic disorders, such as muscular dystrophy and spinal muscular atrophy (SMA).
Muscular Dystrophy
Muscular dystrophy is a group of genetic diseases that cause progressive weakness and degeneration of skeletal muscles. There are over 30 types of muscular dystrophy, which vary in terms of age of onset, severity, and the specific muscles affected. The main symptom of muscular dystrophy is muscle weakness that worsens over time, making everyday tasks more challenging. Some individuals with muscular dystrophy may also experience muscle shortening or contractures, particularly around the joints. This can further limit range of motion and impact activities such as walking and using the arms.
Duchenne muscular dystrophy is associated with higher rates of autism spectrum disorder, ADHD, obsessive-compulsive disorder, and anxiety. Becker muscular dystrophy, a milder form, tends to emerge in the teens or early adulthood and progresses more slowly. Emery-Dreifuss muscular dystrophy causes muscle stiffness and affects the shoulders, upper arms, and calves.
Spinal Muscular Atrophy (SMA)
SMA is a genetic disorder that affects motor neurons, causing muscle weakness and atrophy. It is caused by mutations in the survival motor neuron 1 (SMN1) gene, resulting in insufficient levels of the SMN protein, which is essential for normal motor function. SMA weakens the muscles closest to the center of the body, including the shoulders, hips, thighs, and upper back. There are five types of SMA, ranging in severity and age of onset, from infancy to adulthood. While there is currently no cure for SMA, certain therapies and medications can help manage symptoms.
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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, or certain medical conditions.
Atrophy does not cause muscle shortening, but it does cause muscle wasting or thinning.
Symptoms of muscle atrophy include a decrease in muscle mass, muscle weakness, and numbness or tingling in the limbs.
Treatment for muscle atrophy includes physical therapy, functional electric stimulation, surgery, and anabolic agents. Lifestyle changes, exercise, and a healthy diet can also help reverse muscle atrophy.
There are two main types of muscle atrophy: disuse (physiologic) atrophy and neurogenic atrophy. Disuse atrophy occurs when muscles are not used enough, while neurogenic atrophy is due to nerve problems or diseases.
