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Muscle atrophy is the loss of muscle mass, which can cause a decrease in movement or strength. There are several factors that can cause muscle atrophy, including physical inactivity, malnutrition, ageing, and nerve damage. Physiologic atrophy, for example, is caused by insufficient muscle use, and can be treated with exercise and better nutrition. On the other hand, neurogenic atrophy is caused by nerve damage, which prevents the stimulation of muscle contractions. This type of atrophy can be treated with physical therapy or electrical stimulation.
| Characteristics | Values |
|---|---|
| Type | Physiologic, Pathologic, Neurogenic |
| Cause | Lack of physical activity, nerve damage, aging, malnutrition, genetic factors, medical conditions |
| Treatment | Regular exercise, physical therapy, healthy diet, nutritional supplements, electrical stimulation |
| Prevention | Staying active, good nutrition, passive movement |
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Physiologic atrophy
The process of physiologic atrophy can begin within two to three weeks of muscle disuse. During this time, the body starts to break down muscle tissue, leading to a decrease in muscle size and strength. This type of atrophy is often reversible with targeted exercises and improved nutrition. Healthcare providers may recommend physical therapy, exercises in a swimming pool, or the use of braces or splints to facilitate movement and rebuild muscle.
The treatment for physiologic atrophy focuses on increasing muscle use and improving nutrition. Regular exercise, including strength training and high-intensity interval training (HIIT), can help restore muscle mass and strength. Additionally, working with a dietitian to improve dietary intake and nutritional supplements may be recommended.
It is important to note that the time required to regain muscle after physiologic atrophy depends on the severity of the condition and the individual's age and fitness level. While some improvement may be seen within a few months, full recovery of muscle strength can take a more extended period.
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Neurological conditions
Neurogenic atrophy is a type of muscle atrophy caused by an injury or disease affecting the nerves that connect to the muscles. When these nerves are damaged, they cannot trigger the muscle contractions necessary for muscle activity. As a result, the muscles do not receive stimulation, and the body begins to break them down, leading to a decrease in muscle size and strength. Neurogenic atrophy is considered the most severe form of muscle atrophy and can occur more suddenly than other types.
Several neurological conditions can lead to neurogenic atrophy. These include amyotrophic lateral sclerosis (ALS), also known as Lou Gehrig's disease, which affects the nerves that control muscles. Carpal tunnel syndrome, a condition that affects the median nerve in the wrist, can also cause neurogenic atrophy. Other neurological disorders that can lead to neurogenic atrophy include Guillain-Barre syndrome, multiple sclerosis (MS), and spinal cord injuries.
Neurogenic atrophy can be treated with a specialised form of physical therapy called electrical stimulation or electromyostimulation. This treatment involves placing electrodes on the skin over the affected muscles. Small electrical impulses are then sent to the nerves and muscles, artificially stimulating the muscles and helping to maintain muscle mass and strength.
In some cases, surgery may be an option for treating neurogenic atrophy. Surgical procedures can improve muscle function in individuals with neurological conditions, injuries, or malnutrition-related muscle atrophy. One surgical technique involves the use of focused ultrasound, which stimulates contractions in atrophied muscle tissue to aid in recovery. Another approach is targeted mitochondrial therapy, where active mitochondria or carrier cells are transplanted to the treatment site to regulate mitochondrial function and enhance treatment efficiency.
While neurogenic atrophy is a severe condition, it is important to note that physiologic atrophy, caused by muscle disuse, is more common. This type of atrophy can often be reversed through exercise and improved nutrition. However, neurogenic atrophy requires more specialised treatment options, as outlined above.
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Genetic factors
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 genetics.
Spinal Muscular Atrophy (SMA) is a genetic disorder that affects the central nervous system, peripheral nervous system, and voluntary muscle movement. SMA is the most common genetic cause of mortality in infants, affecting 1 in 6,000 to 10,000 babies worldwide. It is caused by a deficiency of a motor neuron protein called SMN, which is essential for normal motor neuron function. The most common form of SMA is chromosome 5-related SMA, where a mutation in the SMN1 gene on chromosome 5 results in insufficient SMN protein production. This protein is crucial for gene expression in motor neurons, and its deficiency leads to muscle atrophy.
There are five subtypes of SMA, ranging in severity and age of onset. SMA type 1, also known as infantile-onset SMA, is the most severe form, affecting infants within the first six months of life. SMA type 2 emerges between six and 18 months, while SMA type 3 typically appears in children 18 months or older, with muscle weakness being the primary symptom. SMA type 4, a rare form, often begins in early adulthood, with mild to moderate muscle weakness and breathing problems. SMA type 0 is also rare and can cause symptoms at birth or before age 2. The number of copies of the SMN2 gene influences the severity of the condition, with more copies of SMN2 resulting in milder forms of SMA.
In addition to SMA, other genetic disorders can also lead to muscle atrophy. Muscular dystrophy is a group of diseases characterized by muscle weakness and loss of mass. There are over 30 types of muscular dystrophy, with symptoms ranging from muscle pain and stiffness to learning or behavioral challenges. Myotonic dystrophy affects the ability of muscles to relax, often impacting the facial and neck muscles first. Facioscapulohumeral (FSHD) muscular dystrophy causes muscle weakness, typically beginning in the face, shoulders, and upper arms. Congenital muscular dystrophy can cause symptoms at birth or early development, including muscle weakness and delayed milestones.
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Ageing
The amount of muscle loss and the time it takes for atrophy to occur depend on age, fitness level, and cause. Age-related muscle atrophy can be prevented and treated through regular exercise and a healthy diet. A combination of aerobic exercise, resistance training, and balance training is recommended to maintain muscle mass. For those unable to perform intense exercise, less intensive exercises such as chair yoga, water aerobics, and daily walks are suggested.
In addition to the biological changes of ageing, older adults may have additional risk factors such as inactivity, a poor diet, and chronic disease, which contribute to muscle atrophy. A poor-quality diet, specifically a low intake of protein, is suspected to contribute to sarcopenia as the body has increasing trouble turning protein into energy as it ages.
While sarcopenia is a common condition among people over 65, not everyone who lives long enough will develop it. Staying active as you age can significantly reduce your risk of sarcopenia.
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Malnutrition
Several studies have investigated the impact of malnutrition on muscle atrophy in older adults, specifically those hospitalized. One study found that malnourished older patients experienced a 7.0 cm2 (9%) decline in mean mid-thigh muscle cross-sectional area (CSA) during hospitalization, indicating a significant loss of muscle mass. Another study reported that malnourished individuals lost 10% of handgrip strength and 12% of knee extension strength during their hospital stay, further emphasizing the detrimental effects of malnutrition on muscle strength and function.
The combination of malnutrition and physical inactivity can exacerbate muscle wasting and negatively impact muscle strength and physical functioning, particularly in the upper and lower extremities of older individuals. This highlights the importance of early recognition and intervention for malnutrition in hospitalized patients to prevent or mitigate muscle atrophy.
Treating malnutrition-related muscle atrophy involves addressing the underlying nutritional deficiencies. This may include working with a dietitian to develop a healthy eating plan, incorporating nutritional supplements, and ensuring adequate calorie and protein intake to support muscle health. Additionally, physical activity and strengthening exercises can help rebuild muscle mass and improve muscle function. In some cases, physical therapy or rehabilitation may be recommended to enhance muscle strength and mobility.
It is important to consult with healthcare professionals, including doctors and dietitians, to determine the most appropriate treatment plan for malnutrition-related muscle atrophy, as early intervention is crucial for optimal recovery.
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Frequently asked questions
Muscle atrophy is the loss of muscle mass.
Muscle atrophy is caused by not using the muscles enough, nerve damage, aging, malnutrition, and some medical conditions.
Treatment for muscle atrophy includes regular exercise, physical therapy, and improving nutrition.
