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Muscle wasting in the legs can be caused by several factors, including aging, physical inactivity, nerve damage, and underlying medical conditions. Age-related muscle loss, known as sarcopenia, typically begins around the age of 30 and progresses gradually, affecting the ability to perform daily tasks. Physical inactivity and a sedentary lifestyle can also contribute to muscle wasting. Additionally, nerve-related conditions such as amyotrophic lateral sclerosis (ALS), multiple sclerosis (MS), and muscular dystrophy can lead to muscle wasting in the legs. Furthermore, chronic illnesses, critical illnesses, and inflammatory diseases are associated with muscle atrophy and wasting. Malnutrition and inadequate protein intake are also factors that can cause muscle wasting. Early diagnosis and treatment are crucial for overall well-being and to prevent further muscle atrophy.
| Characteristics | Values |
|---|---|
| Muscle wasting causes | Muscle atrophy, aging, physical inactivity, nerve or muscle-related health conditions, malnutrition, chronic diseases, autoimmune diseases, hormonal changes, inadequate protein intake, nerve cell decline |
| Symptoms | Reduced muscle mass, weakness in limbs, numbness or tingling in limbs, trouble walking or balancing, difficulty swallowing or speaking, gradual memory loss, loss of stamina, difficulty performing daily activities, poor balance, falls |
| Tests | Hand grip test, chair stand test, walking speed test, 400-meter walk test, short physical performance battery, timed-up and go test, blood test, muscle or nerve biopsy, electromyography, nerve conduction studies, MRI scan, CT scan |
| Treatment | Physical therapy, strength training, cardio, flexibility exercises, nutrition plan with increased protein and calories, healthy diet, exercise |
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What You'll Learn
Neurogenic conditions
Neurogenic atrophy or neurogenic muscle wasting is caused by nerve problems or diseases. It occurs when nerve cells that control voluntary movement die and stop sending signals to the muscles to move. This can be due to a variety of neurogenic conditions, including:
Amyotrophic Lateral Sclerosis (ALS)
ALS is a progressive disease that affects nerve cells throughout the body, including those in the brain and spinal cord that send signals to the muscles to move. The specific cause of ALS is unknown.
Muscular Dystrophy
Muscular dystrophy is a genetic condition that leads to progressive muscle weakness and wasting. There are several types of muscular dystrophy, varying in their age of onset and specific symptoms.
Multiple Sclerosis (MS)
MS is an autoimmune disease that affects the myelin surrounding nerve fibers. This damage to the nerves impacts the muscles, causing atrophy. The rate of muscle loss depends on the severity of the nerve damage.
Chronic Inflammatory Diseases
Chronic inflammatory diseases, such as rheumatoid arthritis and chronic obstructive pulmonary disease (COPD), can lead to neurogenic muscle wasting.
Intensive Care-Induced Muscle Weakness
Being in intensive care can lead to neurogenic muscle atrophy, especially in patients who are immobilized or on bed rest for extended periods.
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Ageing
Muscle wastage in the legs is a common problem as people age. The medical term for this phenomenon is sarcopenia, which comes from the Greek "sarco", meaning flesh, and "penia", meaning deficiency or poverty. Sarcopenia is a type of muscle atrophy, or muscle degeneration, that specifically affects people as they grow older. It is characterised by a decrease in both the number and size of muscle fibres, causing muscles to thin and weaken. While everyone loses muscle mass with age, people with sarcopenia lose it more quickly, starting from around 3% to 5% per decade after age 30, and accelerating after age 60.
There are several factors that contribute to sarcopenia and muscle wastage in the legs as people age. One key factor is physical inactivity and a sedentary lifestyle. Not using muscles leads to faster muscle loss, as the body breaks down the muscle tissue instead of wasting energy maintaining it. This can be due to bed rest or immobilisation after an injury or illness, or simply a lack of physical activity. Inactivity causes a decline in the number of nerve cells that send signals from the brain to the muscles, further exacerbating the problem.
Another factor is diet. As people age, they may consume fewer calories and less protein, which can lead to weight loss and diminished muscle mass. Poor diet and inadequate protein intake can also cause malnutrition, which is another contributor to muscle atrophy. In addition, certain vitamins and minerals play a role in muscle mass and strength, so deficiencies in these can also be a factor.
Hormonal changes that occur with ageing can also contribute to muscle wastage in the legs. Lower levels of hormones such as testosterone, insulin-like growth factor, and growth hormone can affect muscle fibres and lead to sarcopenia.
Finally, certain medical conditions and chronic diseases can increase the risk of muscle wastage in the legs with ageing. These include chronic obstructive pulmonary disease (COPD), kidney disease, diabetes, cancer, HIV, rheumatoid arthritis, and insulin resistance.
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Lack of physical activity
Muscle atrophy or muscle wasting in the legs can be caused by a lack of physical activity. This is also known as disuse (physiologic) atrophy. When muscles are not used enough, the body does not spend energy maintaining them, leading to muscle wastage. Physiologic atrophy can be caused by a sedentary lifestyle or a sudden stop in activity, such as after an injury or surgery. It can also be caused by conditions that make movement difficult, such as osteoarthritis.
Age-related muscle loss, or sarcopenia, is a natural part of the ageing process and can be accelerated by physical inactivity. Sarcopenia is characterised by a loss of muscle mass and strength, which can greatly impact an individual's quality of life by reducing their ability to perform daily tasks. The rate of muscle loss varies, but it is estimated that people may lose 3-5% of their muscle mass per decade after the age of 30, with an acceleration in muscle loss around the age of 60. After the age of 80, studies suggest that between 11% and 50% of people have sarcopenia.
The consequences of muscle atrophy due to inactivity include overall weakness, poor balance, and even frailty. It can also lead to a decrease in stamina and walking speed, as well as difficulty climbing stairs and performing everyday activities.
However, muscle atrophy caused by a lack of physical activity can often be reversed through exercise and a healthy diet. Doctors may recommend physical therapy, strength training, cardio workouts, flexibility exercises, and a nutrition plan that includes adequate protein and calorie intake to help rebuild lost muscle mass and improve strength and mobility.
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Malnutrition
Muscle wasting, or atrophy, is the loss or thinning of muscle mass. It can be caused by disuse of muscles or neurogenic conditions. Malnutrition is a significant cause of muscle wasting, and it can lead to a rapid decline in muscle mass and strength, particularly in the legs.
The impact of malnutrition on muscle wasting is particularly evident in older individuals. Research has shown that significant changes in leg muscle mass occur after the age of 50, with an average loss of 1-2% of muscle mass per year. Older individuals who are malnourished are at an even greater risk of muscle wasting. A study of hospitalized patients aged 66-97 years found that malnourished patients lost 7.0 cm2 (9%) of mid-thigh muscle cross-sectional area (CSA) during their hospital stay, while adequately nourished patients showed no significant loss. Additionally, malnourished subjects lost 10% of handgrip strength and 12% of knee extension strength, indicating a decline in muscle function.
The treatment for muscle wasting caused by malnutrition involves addressing the underlying nutritional deficiencies. This may include dietary changes, nutritional supplements, or medical interventions to manage any health conditions contributing to malnutrition. Physical therapy and exercise can also play a crucial role in rebuilding muscle mass and improving muscle function.
It is important to note that muscle wasting can be a complex issue, and malnutrition may not always be the primary cause. Other factors, such as age, genetics, physical inactivity, and certain medical conditions, can also contribute to muscle atrophy. Therefore, a comprehensive approach to treating muscle wasting may involve addressing multiple factors and seeking appropriate medical advice.
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Diseases such as cancer, muscular dystrophy, and multiple sclerosis
Muscle atrophy, or muscle wastage, can be caused by several diseases, including cancer, muscular dystrophy, and multiple sclerosis.
Cancer patients often experience muscle wasting or cachexia, which is associated with serious clinical consequences such as physical impairment, poor quality of life, reduced tolerance to treatments, and shorter survival. The prevalence of muscle loss in cancer patients varies depending on the type and stage of cancer, ranging from 16% in breast cancer to 40.3% in hepatocellular carcinoma. Available evidence suggests that muscle protein degradation, impaired muscle protein synthesis, and defective myogenesis contribute to cancer-induced muscle wasting. Additionally, metabolic abnormalities and mitochondrial dysfunction have been implicated in the process.
Muscular dystrophy is a group of diseases characterized by progressive muscle weakness and loss of mass. It is caused by genetic mutations affecting proteins necessary for healthy muscles. Duchenne muscular dystrophy, for example, typically manifests in early childhood with symptoms such as delayed walking, frequent falls, and muscle pain. Other types, like Becker muscular dystrophy, may have a slower progression and milder symptoms. Emery-Dreifuss muscular dystrophy causes joint stiffness and muscle wasting in the shoulders, upper arms, and calves. Myotonic muscular dystrophy affects the ability to relax muscles voluntarily, often impacting the facial and neck muscles first.
Multiple sclerosis (MS) is a disease where the body's immune system attacks the myelin sheath that protects nerve fibres. This damage disrupts communication between the brain and body, leading to a range of symptoms, including muscle weakness and spasticity. While MS can affect any muscle group, it commonly impacts the legs, causing difficulties with mobility and balance.
In summary, these diseases—cancer, muscular dystrophy, and multiple sclerosis—can lead to muscle wastage in the legs through various mechanisms, including muscle protein degradation, genetic mutations, and immune system dysfunction. The impact on patients' lives can be significant, affecting their physical abilities, quality of life, and prognosis.
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Frequently asked questions
Muscle wastage, or atrophy, in legs can be caused by several factors, including ageing, physical inactivity, nerve damage, and underlying medical conditions.
Ageing causes muscle wastage through a combination of hormonal changes, decreased nerve cell function, and reduced protein conversion to energy. This process typically begins around the age of 30, with muscle loss accelerating after 60.
Physical inactivity leads to muscle wastage by reducing the demand for muscle mass. This can be due to a sedentary lifestyle, injury, illness, or any prolonged period of immobilization.
Several medical conditions can cause muscle wastage in the legs, including amyotrophic lateral sclerosis (ALS), muscular dystrophy, multiple sclerosis (MS), and certain chronic diseases such as diabetes, cancer, and arthritis.
