Logan Steele
Muscle atrophy is the loss of muscle mass and strength. It can occur due to malnutrition, age, genetics, lack of physical activity, or certain medical conditions. Disuse atrophy happens when muscles are not used enough, while neurogenic atrophy is caused by nerve problems or diseases. Sarcopenia, a type of muscle atrophy, is an age-related progressive loss of muscle mass and strength. It is caused by a decrease in protein production and changes in hormones like testosterone and insulin-like growth factor. Muscular dystrophy is another condition that causes muscle atrophy, leading to progressive weakness and loss of muscle mass due to abnormal genes. While muscle loss is a natural part of aging, it can be slowed or reversed through progressive resistance training, a healthy diet, and increased protein intake.
| Characteristics | Values |
|---|---|
| Definition | Muscle atrophy is the loss or thinning of muscle tissue. |
| Muscle appearance | Muscles look smaller than normal. |
| Muscle strength | Loss of muscle strength. |
| Muscle movement | Loss of movement. |
| Muscle weakness | Tingling, numbness, and weakness in arms and legs. |
| Muscle groups | Facial and neck muscles, hip and shoulder muscles, muscles of the arms. |
| Causes | Malnutrition, age, genetics, lack of physical activity, nerve problems, diseases, stroke, sedentary lifestyle, injury, unhealthy diet. |
| Treatment | Progressive resistance-based strength training, healthy diet, physical therapy, surgery, medication. |
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Muscle atrophy
There are three main types of muscle atrophy: physiologic, pathologic, and neurogenic. Physiologic atrophy, also known as disuse atrophy, is caused by not using the muscles enough due to a sedentary lifestyle, malnutrition, genetic disorders, or health problems that limit movement. 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 over-administration of corticosteroids or an overactive adrenal gland. Aging-related muscle atrophy, also known as sarcopenia, is characterised by a decrease in muscle mass and strength due to reduced protein production and changes in hormones such as testosterone and insulin-like growth factor (IGF-1).
Neurogenic atrophy is the most severe form of muscle atrophy and is caused by injuries or diseases affecting the nerves that connect to the muscles. Conditions such as amyotrophic lateral sclerosis (ALS), multiple sclerosis, carpal tunnel syndrome, and spinal cord injuries can lead to neurogenic atrophy. When these nerves are damaged, they cannot trigger the muscle contractions necessary for muscle activity, causing the muscles to waste away.
The treatment for muscle atrophy depends on its underlying cause but often includes exercise, physical therapy, and improved nutrition. In some cases, surgery may be required. While physiologic atrophy is often reversible, neurogenic atrophy and pathologic atrophy due to certain diseases may be more challenging to treat.
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Sarcopenia
The main symptom of sarcopenia is muscle weakness. Other symptoms include loss of stamina, difficulty performing daily activities, walking slowly, trouble climbing stairs, poor balance, and an increased risk of falls and fractures. The condition can greatly impact an individual's quality of life and independence.
The cause of sarcopenia is widely regarded as multifactorial, with neurological decline, hormonal changes, inflammatory pathway activation, declines in activity, chronic illness, fatty infiltration, and poor nutrition all shown to be contributing factors. As people age, their bodies produce fewer proteins that muscles need to grow, and changes in certain hormones, such as testosterone and insulin-like growth factor (IGF-1), affect muscle fibres. Immobility dramatically increases the rate of muscle loss, even in younger people.
While there is no consensus diagnosis or widely accepted definition for sarcopenia, it is typically diagnosed when a patient has muscle mass that is at least two standard deviations below the relevant population mean and has a slow walking speed. Treatment options include progressive resistance-based strength training and maintaining a healthy diet with adequate protein intake.
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Malnutrition
Muscle atrophy, or muscle loss, can be caused by several factors, including malnutrition. Malnutrition refers to undernutrition or overnutrition, or an imbalance of macronutrients (proteins, carbohydrates, fats) and micronutrients (vitamins and minerals). Undernutrition is the most common understanding of malnutrition and is a deficiency of nutrients. This can be due to an inadequate diet or the body's inability to absorb nutrients from food.
Protein intake plays a crucial role in maintaining muscle mass. The use of high-protein oral nutritional supplements in clinical settings and after hospital discharge has been associated with improved functional status and reduced complications. In contrast, patients with malnutrition showed lower handgrip and isometric knee extension strength on admission and at discharge.
Disuse (physiologic) atrophy, caused by a sedentary lifestyle, malnutrition, or lack of exercise, can lead to muscle loss. Neurogenic atrophy, on the other hand, is caused by nerve problems or diseases that prevent muscle contractions, leading to muscle breakdown and a decrease in size and strength.
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Neurogenic atrophy
Muscle atrophy is the loss or thinning of muscle mass. There are three types of muscle atrophy: physiologic, pathologic, and neurogenic. While physiologic atrophy can be reversed with exercise and a healthy diet, neurogenic atrophy is more challenging to reverse due to the physical damage caused to the nerves.
Diseases and conditions that can lead to neurogenic atrophy include Amyotrophic Lateral Sclerosis (ALS), Guillain-Barre Syndrome, Carpal Tunnel Syndrome, Spinal Cord injuries, and Multiple Sclerosis. The specific nerves affected can be identified through a physical examination and medical history review, along with tests such as blood tests, muscle or nerve biopsies, and imaging scans.
The impact of neurogenic atrophy extends beyond physical symptoms, as individuals may experience a reduced functional status and quality of life. Unfortunately, due to the nature of the nerve damage, neurogenic atrophy typically cannot be reversed, and treatment options are limited. However, physical therapy and other rehabilitation methods may help manage the condition.
In summary, neurogenic atrophy is a severe form of muscle atrophy resulting from nerve injuries or diseases. It causes muscle wasting and loss of function, impacting an individual's quality of life. While treatment options are available, the condition cannot typically be reversed due to the physical nerve damage.
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Muscular dystrophy
Muscle atrophy is the loss or thinning of muscle tissue, resulting in decreased muscle mass and strength. It can be caused by various factors, including malnutrition, age, genetics, lack of physical activity, and certain medical conditions.
Now, muscular dystrophy is a group of more than 30 genetic conditions that cause progressive muscle weakness and other related symptoms. It is caused by abnormal genes (mutations) that interfere with the production of proteins necessary for healthy muscle development. This results in a decrease in muscle mass and strength, similar to muscle atrophy.
There are many types of muscular dystrophy, including:
- Duchenne muscular dystrophy (DMD): The most common form, primarily affecting young boys, but girls can also have milder symptoms. As it progresses, it impacts the heart and lungs.
- Becker muscular dystrophy (BMD): The second most prevalent type, typically affecting boys, with girls experiencing milder symptoms. Symptoms usually manifest between ages 5 and 60, often in the teenage years.
- Myotonic dystrophy: The most frequently diagnosed form in adults, affecting men and women equally. Individuals with this type struggle to relax their muscles after use, and it can also impact the heart, lungs, and endocrine system.
- Congenital muscular dystrophies (CMD): This group of muscular dystrophies is apparent at or near birth and causes overall muscle weakness, along with potential joint stiffness or looseness. It may also involve spinal curvature (scoliosis), breathing issues, intellectual disabilities, and eye problems.
- Distal muscular dystrophy: This variety affects the muscles in the hands, feet, lower arms, and lower legs.
- Emery-Dreifuss muscular dystrophy (EDMD): EDMD predominantly impacts male children and young adults, causing muscle weakness in the shoulders, upper arms, and shins. It can also affect the heart.
- Facioscapulohumeral muscular dystrophy (FSHD): FSHD commonly affects the face, shoulders, and upper arm muscles. It usually manifests before the age of 20.
- Limb-girdle muscular dystrophy (LGMD): LGMD influences the muscles in the upper arms, upper legs, shoulders, and hips. It occurs in people of all ages.
- Oculopharyngeal muscular dystrophy (OPMD): OPMD weakens the muscles in the eyelids and throat, often leading to droopy eyelids and swallowing difficulties. Symptoms typically emerge in the 40s or 50s.
While there is currently no cure for muscular dystrophy, medications and therapies can help manage symptoms and slow the progression of the disease. Organizations like the Muscular Dystrophy Association (MDA) are dedicated to empowering those affected by muscular dystrophy and other neuromuscular conditions to live longer and more independent lives.
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Frequently asked questions
Muscle loss, or muscle atrophy, is the loss or thinning of muscle tissue and mass. It can occur due to malnutrition, ageing, genetics, lack of physical activity, or certain medical conditions.
Symptoms include a decrease in muscle size and strength, leading to reduced mobility and increased risk of falls and fractures. One arm or leg may be noticeably smaller than the other. Other symptoms include muscle weakness, loss of stamina, difficulty performing daily activities, and trouble climbing stairs.
Muscle loss is primarily caused by inactivity, but it can also be related to ageing, genetic factors, malnutrition, and certain diseases or medical conditions.
Muscle loss can often be treated and reversed through regular exercise, physical therapy, and in some cases, surgery. A progressive resistance-based strength training program, paired with a healthy, high-protein diet, can help rebuild and maintain muscle mass.
If you notice certain parts of your body looking smaller or feeling weaker, you should consult a healthcare professional. They will examine your body, review your medical history, and may recommend a treatment plan to help restore muscle mass and strength.
