Dominic Stone
Muscle wasting, or atrophy, is the loss of muscle mass and strength due to several factors, including injury, immobility, and lack of physical activity. It is a natural part of aging, but certain conditions can accelerate this process, such as muscular dystrophy, multiple sclerosis, and spinal muscular atrophy. Disuse atrophy, the most common type, 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 impair muscle contractions. While muscle wasting can have severe consequences, such as overall weakness and poor balance, it can often be treated and even prevented through regular exercise, physical therapy, and proper nutrition.
| Characteristics | Values |
|---|---|
| Natural causes | Ageing |
| Lifestyle causes | Sedentary lifestyle, inadequate nutrition, lack of exercise |
| Medical causes | Malnutrition, injury, illness, surgery, stroke, osteoarthritis, multiple sclerosis, muscular dystrophy, polymyositis, amyotrophic lateral sclerosis, dermatomyositis, Guillain-Barré syndrome, carpal tunnel syndrome, spinal muscular atrophy, cancer, HIV |
| Treatment | Physical therapy, exercise, dietary changes, ultrasound therapy, surgery |
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What You'll Learn
Lack of physical activity
Muscle atrophy, or muscle wasting, is the wasting or thinning of muscle mass. It is usually caused by a lack of physical activity. Physiologic atrophy, or disuse atrophy, occurs when muscles are not used enough. When muscles don't contract, the body thinks they are unnecessary and starts breaking them down, causing a decrease in size and strength.
Physiologic atrophy is often caused by a sedentary lifestyle, a desk job, or a health problem that limits movement. It can also be caused by osteoarthritis, which makes staying active difficult. The risk of physiologic atrophy increases with age, and older people may take longer to recover from muscle loss.
If you are physically inactive, your muscles can waste away. This can happen if you are bedridden or unable to move certain body parts due to a medical condition. For example, astronauts can experience muscle atrophy after a few days of weightlessness. Bed rest or immobility can lead to a loss of muscle mass, and a 40% decrease in muscle strength can occur within the first week.
However, muscle atrophy due to inactivity can often be reversed with regular exercise and physical therapy. Doctors recommend strength training, cardio, and flexibility exercises to rebuild muscle. Weight training with dumbbells and resistance bands is ideal, and other muscle-building exercises include rowing, swimming, walking, and cycling.
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Malnutrition
Muscle wasting, or atrophy, is the loss or thinning of muscle tissue. It is usually caused by a lack of physical activity or underlying health conditions. Malnutrition is a significant cause of muscle atrophy, and it can lead to a rapid decrease in muscle mass and strength.
People who are malnourished may experience a decrease in muscle mass and strength, which can lead to a condition called sarcopenia. Sarcopenia is characterized by a progressive loss of muscle mass and strength, which is common among older adults. It contributes to functional decline, an increased risk of falls and fractures, and higher morbidity and mortality. Malnutrition, in combination with physical inactivity, can accelerate muscle wasting and negatively impact muscle strength and physical functioning, especially in older individuals.
The impact of malnutrition on muscle wasting has been studied, and it has been found that malnutrition is a major risk factor for significant muscle loss. In one study, malnourished older individuals experienced an average loss of 9% of thigh muscle mass within just 14 days of illness, which is comparable to the average muscle mass loss during nine years of aging. This highlights the rapid and severe effects of malnutrition on muscle wasting.
To prevent and treat muscle wasting due to malnutrition, addressing the underlying nutritional deficiencies is crucial. This may involve dietary changes, supplements, or a combination of both. Additionally, regular exercise and physical therapy can help reverse muscle atrophy. Ultrasound therapy, a non-invasive procedure using sound waves, is another potential treatment option for muscle wasting caused by malnutrition.
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Ageing
Muscle wasting or atrophy is usually caused by a lack of physical activity. This can be due to an injury, an underlying health condition, or a sedentary lifestyle. Age-related muscle loss, called sarcopenia, is a natural part of the ageing process. It is a clinically significant loss of muscle mass and strength resulting from normal ageing. Sarcopenia can begin as early as age 30, but for many older adults, this loss happens more quickly and can lead to increased falls, hospitalization, and reliance on long-term care. After 40 years of age, muscle mass begins to decrease around 1-2% per year, and after 50-60 years, the strength of the muscle gradually decreases around 1.5% per year. Sarcopenia can lead to an increased risk of falls, hospitalization, reliance on long-term care, and even death.
The causes of muscle wasting in the elderly are multifactorial, including changes in skeletal muscle quantity and quality, leading to muscle weakness and disability. This can be accelerated by underlying diseases and conditions, such as malnutrition, cancer, and gastrointestinal disorders. Additionally, a sedentary lifestyle and a lack of exercise can contribute to muscle wasting in older adults.
To prevent and treat muscle wasting in the elderly, exercise and nutritional interventions are crucial. Resistance and endurance training are effective measures to improve muscle metabolism and function, thereby enhancing the quality of life. Additionally, a diet rich in high-quality protein can help prevent sarcopenia by providing the amino acid leucine, which is essential for regulating muscle growth. Soy, fish, and beef are excellent sources of leucine.
It is important to note that muscle atrophy can often be reversed through regular exercise and proper nutrition. Physical therapy and focused ultrasound therapy are also recommended treatments for muscle wasting. However, it is always best to consult with a doctor or physical therapist to determine the appropriate exercises and interventions for your specific needs and limitations.
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Medical conditions
Muscle wasting or atrophy is usually caused by insufficient physical activity or disuse of muscles. However, it can also be caused by several medical conditions. Here are some of the medical conditions that can lead to muscle wasting:
Muscular Dystrophy
Muscular dystrophy is a genetic condition that results in progressive muscle weakness and muscle wasting. It is inherited from parents, and each type varies in its specific symptoms and age of onset. The condition causes a loss of strength, leading to the wasting away of muscle tissue.
Multiple Sclerosis (MS)
Multiple sclerosis is an autoimmune disease that affects the myelin surrounding nerve fibers. The damage to these nerves impacts their ability to trigger muscle movement, leading to atrophy. The rate of muscle loss depends on the severity of the nerve damage.
Spinal Muscular Atrophy
Spinal muscular atrophy is a genetic condition similar to muscular dystrophy, caused by a loss of motor neurons. It leads to a gradual weakening of muscles, typically affecting the muscles closer to the center of the body more severely.
Amyotrophic Lateral Sclerosis (ALS)
Also known as Lou Gehrig's disease, ALS is a progressive disease that affects nerve cells throughout the body, including those that control voluntary muscle movement. This results in muscle wasting and weakness.
Other Conditions
Other medical conditions that can contribute to muscle wasting include Guillain-Barre syndrome, an autoimmune condition causing nerve inflammation and muscle weakness; dermatomyositis, which causes muscle weakness and a skin rash; and polymyositis, an autoimmune inflammatory disease. Additionally, malnutrition, cancer, and age-related muscle loss (sarcopenia) can also lead to muscle atrophy.
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Inactivity due to illness or injury
Muscle wasting or atrophy is usually caused by not being able to exercise your muscles regularly. This inability to move may be due to an injury or an underlying health condition. When a disease or injury makes it difficult or impossible for you to move your arm or leg, the lack of mobility can result in muscle wasting. Over time, without regular movement, your arm or leg can start to appear smaller.
Muscle atrophy due to inactivity can occur if a person remains immobile while recovering from an illness or injury. This type of atrophy is reversible with regular exercise, physical therapy, and a proper diet. It can develop within 10 days in healthy older adults on bed rest, and a 40% decrease in muscle strength can occur within the first week.
Muscle wasting can occur rapidly during critical illness and negatively affect quality of life. A 2013 study noted that significant changes to leg muscle mass occur after the age of 50 years when a muscle loss of 1–2% a year is typical.
To prevent muscle wasting, it is important to focus on any activity that is possible. For example, water exercises can help make movement easier. It is also important to improve nutrition, as malnutrition can cause muscle loss.
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Frequently asked questions
Muscle wasting, or atrophy, is caused by a lack of physical activity, malnutrition, injury, illness, old age, and certain medical conditions.
Signs of muscle wasting include a decrease in muscle mass, weakness, and numbness or tingling in the affected area.
Muscle wasting can be treated with physical therapy, exercise, and dietary changes.
