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Muscle loosening, or muscle atrophy, is the wasting or thinning of muscle mass. It can be caused by muscle disuse, malnutrition, aging, genetics, or certain medical conditions. Symptoms include a decrease in muscle mass, muscle weakness, and numbness or tingling in the limbs. Treatment for muscle atrophy includes physical therapy, exercise, and in some cases, surgery. Muscle atrophy can be diagnosed through a physical exam, questionnaires, and tests such as blood tests, muscle biopsies, and imaging scans. It is important to address muscle atrophy as it can negatively impact an individual's quality of life and increase the risk of injuries.
| Characteristics | Values |
|---|---|
| Definition | Muscle wasting or thinning |
| Cause | Lack of physical activity, malnutrition, age, genetics, nerve problems, diseases, muscle inflammation, stroke, injury, illness, and certain medical conditions |
| Symptoms | Decrease in muscle mass, one limb being smaller than the other, weakness, numbness, tingling, trouble walking or balancing, difficulty swallowing or speaking, loss of stamina, difficulty performing daily activities, walking slowly, poor balance, falls, decrease in muscle size, muscle weakness, muscle pain, muscle cramps, difficulty speaking, swallowing, using hands |
| Diagnosis | Physical exam, blood test, muscle or nerve biopsy, electromyography (EMG), nerve conduction studies, CT scan, MRI scan, handgrip test, dual-energy X-ray absorptiometry (DEXA or DXA), bioelectrical impedance analysis (BIA) |
| Treatment | Exercise, physical therapy, surgery, anti-thyroid medications, radioactive iodine, healthy diet, progressive resistance-based strength training, protein supplements, focused ultrasound therapy |
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What You'll Learn
Muscle atrophy
Disuse atrophy can often be reversed with exercise and improved nutrition. A healthy diet, sufficient calories, and increased protein intake can help treat muscle atrophy. Physical therapy and exercises, including water exercises, can be recommended to improve muscle strength. In some cases, surgery may be an option to correct the condition, along with addressing any underlying medical conditions.
The symptoms of muscle atrophy depend on its cause and can vary in severity. Common signs include a decrease in muscle mass, with one limb appearing smaller than the other. Other symptoms include weakness, numbness, and tingling in the limbs, along with trouble walking, balancing, swallowing, or speaking. In some cases, muscle atrophy may cause facial muscle weakness and difficulty speaking or swallowing.
The time it takes for muscle atrophy to develop depends on age, fitness level, and the specific cause. Disuse atrophy can start within two to three weeks of muscle disuse, while neurogenic atrophy may develop sooner depending on the individual's health condition. Diagnosis of muscle atrophy involves a physical examination, discussion of symptoms, and specific tests to identify the underlying cause.
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Neurogenic atrophy
Muscle atrophy is the wasting or thinning of muscle mass. It can be caused by disuse of muscles or neurogenic conditions. There are three types of muscle atrophy: physiologic, pathologic, and neurogenic. Physiologic atrophy is caused by not using the muscles enough, which can be due to a sedentary lifestyle, old age, or certain diseases. Pathologic atrophy is associated with ageing, starvation, and diseases such as Cushing's disease.
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. In ALS, the nerve cells that control voluntary movement die, causing muscles to atrophy due to lack of use. Multiple Sclerosis (MS) is an autoimmune disease that affects the myelin surrounding nerve fibres, causing damage to the nerves and, in turn, the muscles. Spinal muscular atrophy generally has a poor outcome, with most cases resulting in respiratory compromise.
To diagnose muscle atrophy, a healthcare provider will perform a physical exam and ask about symptoms. They will look at the arms and legs and measure muscle mass. Further tests may be ordered, such as blood tests, muscle or nerve biopsies, and imaging scans. Treatment for neurogenic atrophy depends on the type and underlying cause. While physiologic atrophy can often be reversed with exercise and better nutrition, neurogenic atrophy often requires targeted treatments like focused ultrasound therapy.
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Malnutrition
Muscle atrophy, or muscle wasting, is the thinning or loss of muscle tissue and mass. It can be caused by disuse of muscles, neurogenic conditions, ageing, genetics, or certain medical conditions. Disuse atrophy 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 affect the nerves connecting to the muscles, resulting in an inability to trigger muscle contractions and subsequent muscle breakdown.
Individuals experiencing malnutrition may exhibit symptoms such as muscle weakness, numbness, or tingling in the limbs. The severity of muscle wasting depends on the extent of muscle mass loss. Malnutrition-induced muscle loss can dramatically impact an individual's quality of life and ability to perform daily tasks. Early identification and intervention are essential, especially in high-risk populations, to prevent further deterioration and improve overall health outcomes.
The effects of malnutrition on muscle health can be mitigated through proper nutrition and physical therapy. Nutritional interventions should focus on ensuring adequate intake of energy, protein, and micronutrients. Physical therapy may involve passive exercises for individuals with limited mobility or specific exercises tailored to an individual's condition. Additionally, focused ultrasound therapy is a novel treatment that stimulates muscle contraction using high-frequency sound waves, aiding in the prevention of muscle loss.
The combination of nutritional assessment and muscle mass measurements is crucial for effective evaluation and intervention planning. Healthcare professionals play a vital role in educating individuals about maintaining wellness and good muscle health across their lifespan. By integrating nutritional and physical interventions, clinicians can tailor optimal treatment plans to preserve muscle mass and function in patients experiencing malnutrition-related muscle atrophy.
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Aging
Sarcopenia is a type of muscle atrophy, specifically the loss of muscle tissue, that can greatly impact one's quality of life. The main symptom of the condition is muscle weakness, but it can also cause loss of stamina, difficulty performing daily activities, walking slowly, trouble climbing stairs, poor balance, and an increased risk of falls and injuries. The risk of low-trauma fractures from falls, such as broken hips, collarbones, legs, arms, or wrists, is 2.3 times higher for people with sarcopenia. As people lose muscle, they are also at an increased risk for osteoporosis. This can trigger a cycle where a person becomes less active due to the fear of future accidents, leading to further muscle loss and a higher risk of injuries.
The development of sarcopenia is influenced by various factors, including biological changes, inactivity, poor diet, and chronic disease. Older adults are likely to have additional risk factors, such as inactivity, a poor diet, and chronic diseases, which contribute to muscle loss and weakness. Studies suggest that staying active as you age can significantly reduce the risk of sarcopenia. Engaging in strengthening exercises at least 2 to 3 times a week is essential to maintaining muscle mass and preventing muscle loss. Progressive resistance training (PRT) is recommended, as it involves gradually increasing workout volume, weight, reps, and sets as strength and endurance improve. This constant challenge builds muscle and prevents plateaus.
In addition to exercise, diet also plays a crucial role in maintaining muscle mass. As people age, their bodies require more protein to keep their muscles strong and energized. It is recommended that healthy adults get between 10% and 35% of their daily calories from protein, with a more specific range of 20-35 grams of protein at each meal. Animal sources such as meat, eggs, and milk are considered the best as they provide the proper ratios of essential amino acids. However, it is important to avoid red and processed meat due to high levels of saturated fat and additives. Instead, lean chicken, salmon, poultry, fish, low-fat dairy, lentils, and beans are healthier options. Protein powders can also be added to meals like oatmeal, shakes, and yogurt to boost protein intake. Consuming a drink or meal with a carbohydrate-to-protein ratio of about 3-to-1 or 4-to-1 within 30 minutes after a workout is recommended to maximize muscle growth and improve recovery.
While aging is inevitable, the effects of muscle loss can be slowed down or even reversed through lifestyle changes. By staying active, engaging in strength training, and adopting a nutritious diet with sufficient protein, older adults can maintain their muscle mass, improve their strength, and preserve their independence.
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Sedentary lifestyle
Muscle atrophy is the thinning or wasting of muscle mass. It can be caused by muscle disuse or neurogenic conditions. Physiologic atrophy occurs when muscles are not used enough, while neurogenic atrophy is caused by nerve problems or diseases. A sedentary lifestyle is a common cause of physiologic atrophy.
A sedentary lifestyle involves spending a lot of time sitting and being physically inactive. This type of lifestyle is common among college students and office workers, who are sedentary during most of their school or work and leisure time. The negative health impacts of a sedentary lifestyle are well-documented, including links to chronic illnesses such as cardiovascular, metabolic, and musculoskeletal disorders.
Sedentary behavior is associated with poor well-being, especially in young people, and these adverse effects can extend into adulthood. Students with low physical activity levels and more time spent sitting have been found to have imbalanced trunk muscles, poor respiratory function, poor sleep, and a lower quality of life. Sedentary behavior is also associated with poor mental health, as physical activity is a natural stress reliever. A lack of physical activity can lead to disruptions in brain chemistry, reduced blood flow to the brain, and negative impacts on stress hormones, potentially leading to chronic stress.
In terms of muscle health, a sedentary lifestyle can lead to muscle atrophy, particularly in the legs and gluteal muscles. This means that these muscles become weaker and smaller over time, affecting overall strength and mobility. Sitting for long periods causes hip flexors to shorten and tighten, leading to hip pain, mobility issues, gait changes, and an increased risk of falls. Prolonged sitting can also lead to poor posture, causing chronic pain and discomfort, as well as premature degeneration of spinal discs, resulting in back pain and other spinal issues.
To counteract the negative effects of a sedentary lifestyle, it is important to incorporate physical activity and movement into daily routines. This can include simple strategies such as alternating between sitting and standing throughout the day, taking walking breaks, doing desk exercises, taking active lunch breaks, and incorporating movement into TV time. Household chores can also be opportunities for exercise, and small changes like taking the stairs, parking further away from destinations, and standing on public transport can all help to reduce sedentary time.
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Frequently asked questions
Muscle atrophy is the wasting or thinning of muscle mass. It can be caused by muscle disuse, malnutrition, age, genetics, lack of physical activity, or certain medical conditions.
Symptoms of muscle atrophy include a decrease in muscle mass, one limb being smaller than the other, weakness, numbness or tingling in the limbs, trouble walking or balancing, and difficulty swallowing or speaking.
Yes, muscle atrophy can be reversed through regular exercise, physical therapy, and a healthy diet.
Medical conditions that can lead to muscle atrophy include amyotrophic lateral sclerosis (ALS), muscular dystrophy, multiple sclerosis (MS), polio, mitochondrial dysfunction, and myositis.
