Dominic Stone
Muscle atrophy, or the wasting and thinning of muscle mass, can occur due to several factors, including malnutrition, age, genetics, lack of physical activity, or certain medical conditions. Disuse atrophy, caused by insufficient muscle movement, can lead to a decrease in muscle size and strength. Neurogenic atrophy, on the other hand, is the result of nerve problems or diseases that impair muscle contractions. Additionally, specific conditions like muscular dystrophy contribute to muscle weakness and loss of mass. Age-related atrophy, known as sarcopenia, is characterized by a gradual loss of muscle mass and strength, commonly affecting older individuals. While muscle atrophy can have various causes, it can often be mitigated through exercise and a healthy diet.
| Characteristics | Values |
|---|---|
| Muscle atrophy | The wasting or thinning of muscle mass |
| Causes | Disuse of muscles, neurogenic conditions, malnutrition, age, genetics, lack of physical activity, certain medications, nerve problems, diseases |
| Symptoms | Decrease in muscle mass, one limb being smaller than the other, weakness, numbness, tingling in limbs, trouble walking or balancing, difficulty swallowing or speaking |
| Reversal | Exercise, healthy diet, physical therapy, ultrasound therapy, surgery |
| Types | Physiologic, pathologic, neurogenic |
| Muscle dystrophy | A group of diseases that cause muscles to become weaker and lose mass over time |
| Sarcopenia | Age-related progressive loss of muscle mass and strength |
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What You'll Learn
Muscular dystrophy
There are several types of MD, including Duchenne MD, Becker MD, myotonic MD, facioscapulohumeral MD, limb-girdle MD, oculopharyngeal MD, and Emery-Dreifuss MD. Duchenne MD is the most common form, primarily affecting boys but occasionally affecting girls as well. It usually manifests in early childhood, causing muscle weakness and affecting movement, including frequent falls, trouble running and jumping, and waddling gait. Becker MD is similar to Duchenne MD but less severe and with a later onset, usually in the teens or early adulthood. Myotonic MD can develop at any age and affects both men and women, causing progressive muscle weakness and wasting, often first affecting the smaller muscles in the face, jaw, and neck. Facioscapulohumeral MD also affects both men and women, typically progressing slowly and causing asymmetric weakness, with muscles around the eyes and mouth affected first. Limb-girdle MD usually develops in late childhood or early adulthood and can progress quickly, affecting muscles around the shoulders and hips and causing serious disability. Oculopharyngeal MD typically develops later in life and tends not to affect life expectancy. Emery-Dreifuss MD usually develops in childhood or early adulthood, and most people with this condition live until at least middle age.
MD can affect an individual's ability to move, walk, and perform daily activities. It can also impact the heart and respiratory muscles, leading to life-threatening complications. While there is currently no cure for MD, treatments such as drug therapy, surgery, heart care, speech therapy, respiratory care, and physical therapy can help manage symptoms and slow the progression of the disease.
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Neurogenic atrophy
Diseases and conditions that can affect the nerves leading to neurogenic atrophy include Amyotrophic Lateral Sclerosis (ALS), Guillain-Barre Syndrome, Carpal Tunnel Syndrome, Spinal Cord injuries, and Multiple Sclerosis.
To diagnose neurogenic atrophy, a healthcare provider will conduct a physical examination, including a review of the patient's symptoms, and measure the muscle mass in the arms and legs. Further tests may include blood tests, muscle or nerve biopsies, electromyography (EMG), nerve conduction studies, computed tomography (CT) scans, and magnetic resonance imaging (MRI) scans.
Treatment for neurogenic atrophy aims to manage the condition and improve the patient's quality of life. While there may be some interventions, reversing the atrophy is typically not possible due to the nerve damage.
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Age-related atrophy
Sarcopenia is a serious condition that can significantly impact an individual's quality of life, making everyday activities like walking, cleaning, and even dressing difficult. It is a major cause of disability and can increase the risk of dangerous falls, broken bones, and even death. The development of sarcopenia is influenced by a combination of biological, lifestyle, and dietary factors.
One biological factor contributing to sarcopenia is the decrease in nerve cells responsible for transmitting signals from the brain to initiate movement. Additionally, lower levels of certain hormones, such as growth hormone, testosterone, and insulin-like growth factor, can play a role. The body's ability to convert protein into energy also decreases with age, further contributing to muscle loss.
Lifestyle factors, such as physical inactivity, can significantly increase the risk of sarcopenia. Spending a lot of time sitting or lying down can contribute to muscle loss, even if individuals exercise during other parts of the day. However, progressive resistance training (PRT) has been shown to effectively build muscle mass and strength in older adults.
Dietary factors also play a role in sarcopenia. A poor diet, particularly one low in protein, can contribute to muscle loss. The body's ability to synthesize protein decreases with age, making adequate protein intake crucial for older adults. Additionally, diets low in fruits and vegetables and high in ultra-processed foods have been linked to lower muscle mass.
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Malnutrition
When the body experiences a deficiency in macronutrients, it deprives the body of the energy it needs to function properly. As a result, the body starts breaking down its own tissues, starting with fat stores and then moving on to muscle, skin, hair, and nails. This breakdown of muscle tissue due to malnutrition is known as muscle atrophy or muscle wasting. It is characterized by a decrease in muscle mass and strength, leading to muscle deterioration.
Studies have shown that malnutrition is highly prevalent in older hospitalized patients and is associated with adverse outcomes. Malnutrition has been linked to low muscle strength and muscle mass in these patients, indicating a potential risk factor for developing low muscle mass. Additionally, malnutrition has been identified as one of the main risk factors for skeletal muscle loss, contributing to the onset of sarcopenia, a condition associated with ageing and characterized by progressive muscle loss.
The impact of malnutrition on muscle wasting is particularly evident in frail, older individuals. In one study, malnourished patients experienced a significant decline in mid-thigh muscle cross-sectional area (CSA), indicating muscle wasting. Furthermore, malnutrition, along with physical inactivity, has been speculated to negatively affect not only muscle mass but also muscle strength and physical functioning in older individuals.
The prevention, diagnosis, and treatment of malnutrition are crucial, especially in hospitalized patients and those in intensive care units (ICUs). Early identification of malnutrition and the implementation of appropriate nutritional strategies are essential to mitigate the adverse effects of malnutrition on muscle health and overall well-being.
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Lack of physical activity
During periods of inactivity, muscle performance and strength decrease, and fatigability increases. This is because the muscles undergo structural, metabolic, hormonal, neural, and molecular changes. These changes can be reversed with exercise, and high-intensity interval training has been shown to be a time-efficient strategy for improving sports performance and health-related fitness.
The effects of disuse atrophy are more pronounced in populations predisposed to muscle atrophy, such as the elderly or those with certain diseases. In the elderly, muscle atrophy can lead to a decreased biological reserve and increased vulnerability to stressors, known as the "frailty syndrome". It is also associated with an increased risk of infection, decreased immunity, and poor wound healing.
To prevent and treat disuse atrophy, regular exercise and physical therapy are recommended. Ultrasound therapy, which uses sound waves to promote muscle healing, is another non-invasive treatment option. In addition, nutritional interventions, such as consuming adequate calories, protein, and branched-chain amino acids, can help prevent muscle atrophy.
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Frequently asked questions
Muscle atrophy is the loss or thinning of muscle mass. It can be caused by muscle disuse, aging, malnutrition, medications, or a wide range of injuries or diseases that impact the musculoskeletal or nervous system.
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's disease. Neurogenic atrophy occurs due to nerve problems or diseases.
Symptoms of muscle atrophy include a decrease in muscle mass, one limb being smaller than the other, weakness, numbness, and tingling in the limbs. More severe cases may lead to trouble walking or balancing, difficulty swallowing or speaking, and a decrease in overall quality of life.
Treatment for muscle atrophy depends on the underlying cause but often includes exercise, adequate nutrition, and physical therapy. Anabolic agents may also be used but are not commonly prescribed due to potential side effects. Maintaining physical activity and a healthy diet with sufficient calories, protein, fruits, and vegetables can help prevent muscle atrophy.
