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Muscle atrophy, or muscle wasting, is the thinning or wasting away of muscle tissue and loss of muscle mass. It can be caused by a variety of factors, including disuse or physiologic atrophy, neurogenic atrophy, malnutrition, age, genetics, and certain medical conditions. Disuse atrophy occurs when muscles are not used enough, leading to a decrease in size and strength. Neurogenic atrophy, on the other hand, is caused by nerve problems or diseases that affect the nerves connected to the muscles, resulting in an inability to stimulate muscle contractions. Malnutrition, ageing, and medical conditions such as amyotrophic lateral sclerosis (ALS), muscular dystrophy, and multiple sclerosis can also contribute to muscle deterioration.
| Characteristics | Values |
|---|---|
| Type | Physiologic, Pathologic, Neurogenic |
| Causes | Prolonged inactivity, Malnutrition, Age, Genetic disorder, Neurological injury or disease |
| Symptoms | Loss of movement, Loss of strength, Numbness, Tingling, Weakness, Difficulty swallowing or speaking |
| Treatment | Exercise, Ultrasound therapy, Surgery, Nutritional changes, Physical therapy |
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What You'll Learn
Neurogenic atrophy caused by nerve injuries or diseases
Muscle atrophy is the wasting or thinning of muscle mass. It can be caused by disuse of muscles or neurogenic conditions. Neurogenic atrophy is caused by nerve injuries or diseases that affect the nerves connected to the muscles. When these nerves are damaged, they cannot trigger the muscle contractions necessary for muscle activity. As a result, the muscles stop contracting, and the body starts breaking them down, leading to a decrease in muscle size and strength.
Neurogenic atrophy is considered the most severe type of muscle atrophy. It tends to occur more suddenly than physiologic atrophy, which is caused by muscle disuse. Neurogenic atrophy is often irreversible due to the physical damage to the nerves. The time it takes for neurogenic atrophy to develop depends on the individual's health condition, age, and fitness level.
Diseases and conditions that can lead to neurogenic atrophy include Amyotrophic Lateral Sclerosis (ALS), also known as Lou Gehrig's disease, which affects nerve cells throughout the body. In people with ALS, the nerve cells that control voluntary movement die, causing the muscles to atrophy due to lack of use. Another example is Guillain-Barre syndrome, a disorder in which the body's immune system attacks the peripheral nervous system, leading to muscle weakness and potential paralysis.
Carpal tunnel syndrome is also a condition that can cause neurogenic atrophy. It involves pressure on the median nerve in the wrist, resulting in pain, numbness, and tingling in the hand and arm. Spinal cord injuries and multiple sclerosis can also lead to neurogenic atrophy by affecting the nerves that control muscles.
In summary, neurogenic atrophy is a severe form of muscle atrophy caused by nerve injuries or diseases. It occurs when the nerves that connect to the muscles are damaged, resulting in a loss of muscle contractions and subsequent muscle breakdown. The treatment for neurogenic atrophy depends on the underlying cause and may include physical therapy, ultrasound therapy, and, in some cases, surgery.
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Physiologic atrophy caused by muscle disuse
Physiologic atrophy, also known as disuse atrophy, is caused by the lack of physical activity or sedentary lifestyle choices. It occurs when an individual doesn't use their muscles enough, leading to muscle wasting or thinning of muscle mass. This can be due to several factors, including leading a sedentary lifestyle, having a desk job, being on bed rest, or having health problems that limit movement.
Disuse atrophy can affect anyone who doesn't use their muscles regularly. For example, individuals with seated jobs or those who are on bed rest due to injuries or illnesses that restrict movement are at risk. It is also common in astronauts during space travel due to the prolonged immobilization experienced in a weightless environment.
The human body prioritizes energy efficiency, so when muscles are not used, the body stops expending energy on maintaining them. As a result, the body begins to break down the muscles, leading to a decrease in both muscle size and strength. This process can start within two to three weeks of muscle disuse, and the rate of muscle atrophy from disuse is approximately 0.5-0.6% of total muscle mass per day.
The good news is that physiologic atrophy is often reversible. Treatment for disuse atrophy focuses on increasing physical activity and improving nutrition. Exercise programs, including swimming and rehabilitation exercises, can help rebuild muscle mass and strength. Additionally, individuals can work with dietitians to develop healthy eating plans and incorporate nutritional supplements to support muscle growth and recovery.
It is important to consult a healthcare provider for guidance on appropriate treatment options, as the recovery process can take several months or even longer for a full recovery of muscle strength.
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Pathologic atrophy caused by aging, starvation, and diseases
Muscle atrophy refers to the wasting or thinning of muscle mass. It can occur due to several factors, including disuse of muscles, neurogenic conditions, malnutrition, ageing, genetics, and certain medical conditions. Pathologic atrophy is a specific type of atrophy that arises from diseases or the loss of trophic support due to other diseases.
Ageing is a common cause of pathologic atrophy. As individuals age, there is a gradual decrease in the ability to maintain skeletal muscle function and mass, leading to a condition called sarcopenia. The exact cause of sarcopenia remains unknown, but it may result from a combination of factors, such as the failure of satellite cells to regenerate skeletal muscle fibers and a decrease in the availability of critical secreted growth factors necessary for muscle maintenance.
Starvation or malnutrition can also induce pathologic atrophy. Malnutrition refers to a lack of proper nutrition, including insufficient protein intake or deficiencies in specific nutrients vital for muscle health. Prolonged malnutrition can lead to muscle wasting and thinning, as the body breaks down muscle tissue to meet its energy needs.
Diseases can also cause pathologic atrophy, particularly those impacting the motor nerves or muscle tissue itself. Examples of atrophy-causing nerve diseases include Charcot-Marie-Tooth disease, poliomyelitis, amyotrophic lateral sclerosis (ALS), and Guillain-Barré syndrome. Atrophying muscle diseases include muscular dystrophy, myotonia congenita, and myotonic dystrophy. Additionally, certain cancers and AIDS can induce a wasting syndrome called cachexia, characterised by severe muscle atrophy.
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Muscular dystrophy, a genetic condition causing muscle weakness
Muscle atrophy or wasting can be caused by a variety of factors, including disuse or physiologic atrophy, neurogenic atrophy, malnutrition, age, genetics, and certain medical conditions. One such medical condition is muscular dystrophy, a group of more than 30 genetic disorders that cause progressive muscle weakness and degeneration.
Muscular dystrophy is characterised by mutations in genes responsible for maintaining healthy muscle structure and function. These mutations prevent cells from carrying out their normal role, leading to progressive muscle weakness. The condition can be inherited from one or both biological parents, or it can occur spontaneously due to a de novo mutation.
There are several types of muscular dystrophy, including myotonic dystrophy, which affects an individual's ability to relax their muscles after use and can also impact the heart, lungs, and endocrine system. Congenital muscular dystrophies (CMD) are a group of muscular dystrophies that are apparent at or near birth and cause overall muscle weakness, possible joint stiffness or looseness, spinal curvature, breathing issues, and intellectual disabilities. Facioscapulohumeral (FSHD) muscular dystrophy typically causes muscle weakness in the face, shoulders, and upper arms, often affecting one side of the body more than the other. Limb-girdle muscular dystrophy (LGMD) is characterised by progressive muscle loss and the symmetrical weakening of voluntary muscles in the shoulders and hips.
The symptoms of muscular dystrophy tend to worsen over time, and many individuals with the condition eventually lose the ability to walk. The condition can also impact other organs, including the heart, lungs, gastrointestinal system, endocrine glands, spine, eyes, and brain. Some people with muscular dystrophy may develop a swallowing disorder, which can lead to nutritional deficiencies and an increased risk of lung infections.
While there is currently no cure for muscular dystrophy, treatment options focus on managing symptoms and slowing the progression of muscle weakness. Physical therapy, exercise, ultrasound therapy, and nutritional interventions may be recommended to help maintain muscle strength and function. In some cases, surgery may be necessary to correct contractures or other complications.
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Amyotrophic lateral sclerosis (ALS), a disease affecting nerve cells
Amyotrophic lateral sclerosis (ALS) is a neurodegenerative disease that affects nerve cells in the brain and spinal cord. It causes progressive muscle weakness and wasting, leading to atrophy or a decrease in muscle size and strength. The condition gets worse over time, impacting movement, speech, and breathing.
ALS damages motor neurons, which are nerve cells that control muscle cells and voluntary movements. When these motor neurons degenerate and die, they stop sending signals to the muscles, resulting in muscle atrophy. This loss of nerve supply causes the muscles to waste away, becoming smaller, weaker, and softer, or stiff, tight, and spastic.
The word "amyotrophic" comes from Greek roots meaning "without nourishment to muscles". "Lateral" refers to the location of the damage in the spinal cord, and "sclerosis" means "hardened", describing the hardened nature of the spinal cord in advanced ALS. The combination of these terms describes the progressive degeneration and scarring that occurs in the affected areas of the spinal cord.
The specific cause of ALS is unknown, but it typically affects individuals in their late middle age or later. Men before the age of 65 or 70 are slightly more likely to develop ALS than women. There are two main types of ALS: sporadic and familial. Sporadic ALS, which makes up about 90% of cases, occurs randomly without a known family history or genetic mutation. Familial ALS, accounting for 5-10% of cases, is caused by inherited gene changes passed down from a parent.
While there is currently no cure for ALS, treatment options are available to manage symptoms and slow the progression of the disease. These include therapies, medications, and multidisciplinary care approaches. Recent advancements include the FDA's approval of tofersen (Qalsody) for treating a form of ALS associated with a specific gene mutation. Research efforts continue worldwide to develop more effective treatments and improve the understanding of ALS.
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Frequently asked questions
Muscle atrophy is the wasting or thinning of muscle mass. It can be caused by muscle disuse or neurogenic conditions.
Symptoms of muscle atrophy include a decrease in muscle mass, one limb being smaller than the other, and numbness, weakness and tingling in the limbs.
There are three types of muscle atrophy: physiologic, pathologic, and neurogenic. Physiologic atrophy is caused by not using the muscles enough. Pathologic atrophy is seen with aging, starvation, and diseases such as Cushing disease. Neurogenic atrophy is caused by an injury or disease affecting nerves that connect to the muscles.
