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Muscle wasting, also known as muscle atrophy, is the thinning or loss of muscle mass. It can be caused by various factors, including lack of physical activity, ageing, malnutrition, nerve damage, and certain illnesses and diseases. The severity and rate of muscle loss depend on the underlying cause, and it can significantly impact an individual's quality of life by reducing their ability to perform daily tasks. While muscle wasting typically occurs gradually, it can be treated and, in some cases, reversed through exercise, nutritional changes, and physical therapy.
| Characteristics | Values |
|---|---|
| Type | Physiologic (Disuse), Pathologic, Neurogenic |
| Causes | Lack of physical activity, ageing, malnutrition, nerve damage, genetic disorders, chronic diseases (e.g. COPD, kidney disease, diabetes, cancer, HIV, rheumatoid arthritis), reduction in hormone levels |
| Symptoms | Decrease in muscle mass, weakness, numbness, tingling in limbs, trouble walking or balancing, difficulty swallowing or speaking, slower movement, loss of balance |
| Treatment | Exercise, physical therapy, ultrasound therapy, surgery, nutritional changes |
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What You'll Learn
- Physiologic atrophy is caused by not using muscles enough
- Neurogenic atrophy is caused by nerve problems or diseases
- Malnutrition or inadequate protein intake can cause muscle wasting
- Genetic conditions such as muscular dystrophy cause muscle wasting
- Age-related atrophy (sarcopenia) is caused by the natural ageing process
Physiologic atrophy is caused by not using muscles enough
Muscle wasting, or atrophy, is the thinning or loss of muscle mass. Physiologic atrophy, or disuse atrophy, is caused by insufficient muscle use. If a person stops using their muscles, their body will conserve energy by breaking down the muscles, leading to reduced size and strength.
Disuse atrophy is often reversible through exercise and improved nutrition. However, it requires sustained effort and time to fully recover muscle strength. Physiologic atrophy is commonly associated with sedentary lifestyles, including seated jobs, health problems that limit movement, and low activity levels.
Age-related muscle atrophy, known as sarcopenia, is a specific form of physiologic atrophy. It is characterised by a gradual loss of muscle mass, strength, and function, typically commencing in the 30s or 40s and accelerating from 65 to 80 years of age. Sarcopenia is influenced by various factors, including reduced protein synthesis, hormonal changes, physical inactivity, and inadequate nutrition. It significantly impacts an individual's quality of life, affecting their ability to perform daily tasks and leading to a loss of independence.
Malnutrition or inadequate protein intake can also contribute to physiologic atrophy. A well-balanced diet, rich in protein, is crucial for maintaining muscle health. Additionally, certain genetic disorders, such as muscular dystrophy, can lead to muscle wasting due to gene mutations that affect the production of proteins necessary for healthy muscles.
Overall, physiologic atrophy, caused by insufficient muscle use, can have detrimental effects on an individual's health and independence. However, through regular exercise, a nutritious diet, and, in some cases, medical treatment, muscle wasting can often be reversed or slowed down.
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Neurogenic atrophy is caused by nerve problems or diseases
Muscle atrophy is the wasting or thinning of muscle mass. It can be caused by the disuse of muscles or neurogenic conditions. The former is reversible through exercise and a healthy diet. However, neurogenic atrophy is caused by nerve problems or diseases and is the most severe type of muscle atrophy. When nerves that connect to the muscles are damaged, they cannot trigger the muscle contractions necessary for muscle activity. As a result, the muscles atrophy and waste away.
Neurogenic atrophy can occur due to an injury or disease affecting nerves that connect to the muscles. Diseases and conditions that can affect these nerves include Amyotrophic Lateral Sclerosis (ALS), Guillain-Barre syndrome, carpal tunnel syndrome, spinal cord injury, and multiple sclerosis. The severity of the nerve damage influences the rate of muscle loss.
Neurogenic atrophy tends to occur more suddenly than physiologic atrophy. It usually cannot be reversed because of the physical damage to the nerves. However, it can sometimes be treated with a special type of physical therapy called electrical stimulation. This involves placing electrodes on the skin over the muscles to send electrical impulses that stimulate muscle contractions. Ultrasound therapy can also be used to promote muscle healing.
Neurogenic atrophy can cause a range of symptoms, including reduced muscle mass, weakness in the limbs, numbness or tingling in the arms and legs, trouble walking or balancing, and difficulty swallowing or speaking. The time it takes to regain muscle after atrophy depends on the severity and type of atrophy.
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Malnutrition or inadequate protein intake can cause muscle wasting
Malnutrition is a major risk factor for muscle wasting, especially in older individuals. Studies have shown that malnourished patients experience a significant decrease in muscle mass during hospitalisation, with a notable loss of handgrip and knee extension strength. This highlights the adverse impact of malnutrition on muscle strength and physical functioning.
Inadequate protein intake as a result of malnutrition leads to muscle wasting because the body breaks down muscle tissue to meet its protein needs. This process, known as muscle catabolism, is the body's way of ensuring a consistent supply of amino acids, which are the building blocks of proteins. When there is a lack of protein in the diet, the body utilises its own muscle tissue to obtain the essential amino acids it requires for various physiological processes.
Additionally, malnutrition often goes hand in hand with physical inactivity, especially in hospitalised patients or those with health problems that limit movement. This inactivity further contributes to muscle wasting. When muscles are not regularly contracted, the body interprets this as a sign that they are not needed, initiating the breakdown of muscle tissue and resulting in muscle atrophy.
The combination of inadequate protein intake and physical inactivity associated with malnutrition creates a detrimental cycle that exacerbates muscle wasting. Addressing malnutrition and ensuring adequate protein intake is crucial in preventing and treating muscle wasting, particularly in older adults and individuals with limited mobility.
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Genetic conditions such as muscular dystrophy cause muscle wasting
Muscle wasting, or atrophy, is the decrease in size and wasting of muscle tissue. It can be caused by various conditions, including genetic disorders such as muscular dystrophy.
Muscular dystrophy is a group of more than 30 genetic conditions that cause progressive muscle weakness and degeneration of skeletal muscles. The symptoms vary in severity and the specific muscles affected, but generally worsen over time. The condition can be present at birth, develop in childhood, or occur in adulthood. The most common form, Duchenne muscular dystrophy (DMD), usually affects young boys, causing muscle weakness and progressive muscle wasting. DMD is caused by a mutation on the X chromosome, resulting in the absence of the muscle protein dystrophin. This leads to degenerative muscle fibres, beginning in the upper legs and pelvis and spreading to the upper arms. Other forms of muscular dystrophy include oculopharyngeal, limb-girdle, and Emery-Dreifuss, which affect different muscle groups and can cause stiffness, swallowing disorders, and heart conditions.
The underlying cause of muscular dystrophy is gene mutations that affect the production of proteins necessary for protecting muscle fibres. These mutations can be identified through genetic tests, and gene therapy is being explored as a potential treatment option. While there is currently no cure for muscular dystrophy, treatments aim to manage symptoms and improve quality of life. Physical therapy and corticosteroids may be used to strengthen and stretch muscles, delay scoliosis, and improve lung function.
In summary, genetic conditions such as muscular dystrophy can cause muscle wasting due to gene mutations that affect muscle function and structure. The progressive nature of muscular dystrophy leads to worsening symptoms over time, impacting individuals' strength and ability to perform daily activities. Treatment options focus on symptom management and slowing the progression of the condition.
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Age-related atrophy (sarcopenia) is caused by the natural ageing process
Muscle wasting or atrophy is the loss or thinning of muscle tissue. It can be caused by disuse of muscles, neurogenic conditions, malnutrition, genetics, or certain medical conditions. Age-related atrophy, or sarcopenia, is a type of muscle atrophy that occurs due to the natural ageing process. It is characterised by a progressive loss of muscle mass, strength, and function, primarily affecting older adults.
Sarcopenia is driven by ageing-related biological changes, including neurological and hormonal factors. As people age, their bodies undergo hormonal changes, such as lower concentrations of growth hormone, testosterone, and insulin-like growth factor (IGF-1). These hormonal changes contribute to the development of sarcopenia. Additionally, there is a reduction in nerve cells responsible for transmitting signals from the brain to initiate muscle movement, which further exacerbates the condition.
The ageing process also affects protein metabolism, making it more challenging for the body to convert protein into energy. This reduced efficiency in protein utilisation may be a contributing factor to sarcopenia, as suggested by some studies. Furthermore, mitochondrial function and mitochondrial biogenesis in skeletal muscles undergo alterations with age, potentially influencing muscle mass and function.
The decline in muscle mass and strength associated with sarcopenia can significantly impact an individual's quality of life. Everyday activities, such as getting out of chairs, opening jars, or carrying groceries, may become difficult. The condition is estimated to affect 5% to 13% of individuals aged 60 and older, with rates increasing to 11% to 50% in people aged 80 and above.
While sarcopenia is primarily driven by the ageing process, physical inactivity and dietary choices can also play a role. Leading a sedentary lifestyle or having a poor diet, particularly one low in protein, can increase the risk of developing sarcopenia. However, staying active and maintaining a healthy diet can help mitigate the effects of age-related atrophy.
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Frequently asked questions
Muscle wasting, also known as muscle atrophy, is the thinning or loss of muscle mass.
Muscle wasting can be caused by various factors, including lack of physical activity, ageing, malnutrition, nerve damage, and certain illnesses and diseases.
Symptoms of muscle wasting include a decrease in muscle mass, weakness, numbness, and tingling in the limbs, as well as difficulty in performing daily activities.
Treatment and prevention of muscle wasting depend on the underlying cause. In some cases, muscle wasting can be treated or slowed with exercise, nutritional changes, and physical therapy.
