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Muscle atrophy, or muscle loss, is the thinning or loss of muscle tissue. It can be caused by muscle disuse or neurogenic conditions. Physiologic atrophy, caused by not using muscles enough, can be reversed with exercise and better nutrition. Neurogenic atrophy is caused by nerve injuries or diseases that affect the nerves connecting to the muscles. Sarcopenia, a type of muscle atrophy, is the age-related loss of muscle mass and strength. It is caused by the natural aging process, physical inactivity, and an unhealthy diet. To check for muscle loss, you can monitor your body fat percentage, weight loss rate, and physical performance. DXA scans and body fat calipers are accurate tools for measuring muscle mass and body fat. Additionally, feeling tired, sluggish, and experiencing mood swings may indicate muscle loss. Seeking medical advice is important if you notice signs of muscle weakness or loss.
| Characteristics | Values |
|---|---|
| Muscle atrophy | Gradual memory loss, tingling, numbness, or weakness in arms and legs |
| Physiologic atrophy | Caused by not using muscles enough |
| Neurogenic atrophy | Caused by an injury or disease affecting nerves that connect to muscles |
| Sarcopenia | Age-related progressive loss of muscle mass and strength |
| Muscular dystrophy | Progressive weakness and loss of muscle mass due to abnormal genes |
| Facioscapulohumeral (FSHD) | Muscle weakness begins in the face, hip, and shoulders |
| Limb-girdle | Hip and shoulder muscles are affected first |
| Measurement tools | Dual-energy X-ray absorptiometry (DXA) scan, body fat calipers, "smart" scales |
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What You'll Learn
Signs of muscle loss
Muscle loss, or muscle atrophy, is the wasting or thinning of muscle mass. It can be caused by the disuse of muscles or neurogenic conditions. The most common symptom of muscle atrophy is muscle weakness. If you have muscle atrophy in your limbs, you may feel tingling, numbness, or weakness in your arms and legs. If the atrophied muscles are in your face or throat, your facial muscles may start feeling weak, and you may find it difficult to speak or swallow.
There are three types of muscle atrophy: physiologic, pathologic, and neurogenic. Physiologic atrophy is caused by not using the muscles enough. This type of atrophy can often be reversed with exercise and better nutrition. People who are most affected are those who have seated jobs, health problems that limit movement, or decreased activity levels. Pathologic atrophy is seen with aging, starvation, and diseases such as Cushing's disease. Neurogenic atrophy is caused by an injury or disease affecting nerves that connect to your muscles. When these nerves are damaged, they can't trigger the muscle contractions needed to stimulate muscle activity. Diseases and conditions that can affect these nerves include Amyotrophic Lateral Sclerosis (ALS), Multiple Sclerosis, and carpal tunnel syndrome.
There are several signs that you are losing muscle mass. One of the most prominent signs is rapid weight loss. While losing weight is an accomplishment, it is important to note that when losing weight, you lose both fat and muscle. Therefore, it is important to monitor your body fat percentage to gauge how much fat you are losing versus muscle mass. You can use body fat calipers to measure, in millimeters, how much fat you can pinch with your fingers in certain areas of the body. Another sign of muscle loss is feeling tired, sluggish, and finding it hard to complete physical activities. Research has also shown that a decrease in muscle mass may negatively impact your mental health and mood.
If you notice signs of muscle loss, there are several ways to treat it. Treatment for muscle atrophy typically includes lifestyle changes such as physical activity and a healthy diet. Your healthcare provider may recommend progressive resistance-based strength training to improve your strength and reverse your muscle loss.
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Causes of muscle loss
Muscle atrophy is the thinning or loss of muscle tissue and can be caused by several factors. Physiologic or disuse atrophy is caused by not using muscles enough. This can be due to leading a sedentary lifestyle, having a desk job, or having health problems that limit movement. This type of atrophy is reversible and can be treated by exercising regularly and eating a healthy diet.
Pathologic atrophy is caused by aging, starvation, and diseases such as Cushing's disease, which can be the result of taking too many corticosteroids or having an overactive adrenal gland. Sarcopenia is a type of pathologic atrophy that specifically affects people as they grow older, causing a progressive loss of muscle mass and strength.
Neurogenic atrophy is caused by an injury or disease that affects the nerves connecting to the muscles. When these nerves are damaged, they cannot trigger the muscle contractions needed to stimulate muscle activity, leading to a decrease in muscle size and strength. Diseases and conditions that can cause neurogenic atrophy include amyotrophic lateral sclerosis (ALS), Guillain-Barre syndrome, carpal tunnel syndrome, spinal cord injuries, and multiple sclerosis.
Additionally, chronic inflammatory diseases, such as cancer cachexia, can lead to skeletal muscle atrophy and weakness. The inflammatory response caused by cancer cells results in metabolic changes, increased protein degradation, and reduced protein synthesis, ultimately leading to muscle loss.
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Measuring muscle loss
Muscle atrophy is the thinning or loss of muscle tissue and mass. It can be caused by the disuse of muscles or neurogenic conditions. The former is caused by not using the muscles enough, leading to a decrease in size and strength. The latter is caused by an injury or disease affecting the nerves that connect to the muscles, resulting in a reduction of muscle contractions and, consequently, muscle activity.
There are various methods to measure muscle loss. One way is to monitor your body fat percentage, which can be done through body fat calipers or smart scales. These devices measure body fat in certain areas of the body, such as the triceps, thighs, and belly, and can help determine the proportion of weight loss that comes from fat versus muscle.
Another method is to undergo a dual-energy X-ray absorptiometry (DXA) scan, which is considered the most accurate way to measure muscle mass and body fat. This enhanced X-ray technology captures data on weight, body fat, muscle mass, and bone density. However, it may not be as accessible or affordable as other methods.
Additionally, physical examinations by healthcare providers can help assess muscle loss. They may compare the appearance and strength of different body parts, such as the arms and legs, to identify muscle atrophy. They may also inquire about medical history, symptoms, and perform further tests to determine the extent of muscle loss and its underlying causes.
It is important to note that muscle loss can be influenced by factors such as age, physical activity levels, diet, and underlying health conditions. Maintaining muscle mass through strength-building exercises, adequate protein intake, and a balanced diet can help prevent muscle atrophy and promote overall health.
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Reversing muscle loss
Muscle loss, or atrophy, is a common condition that affects older adults. It can be caused by the natural aging process, physical inactivity, and eating an unhealthy diet. While a small amount of muscle loss is inevitable with age, it can be slowed and sometimes even reversed. Here are some ways to reverse muscle loss:
Exercise
Regular exercise is key to reversing muscle loss. Aim for 2-4 sessions of moderate-intensity exercise per week, focusing on a combination of aerobic exercise, resistance training, and balance training. Resistance exercises are the most direct way to increase muscle mass and prevent its loss. This includes weightlifting, pulling against resistance bands, or moving your body against gravity (e.g. calisthenics such as squats, push-ups, and sit-ups). For those who cannot do intense exercise, even simple movements like daily walks or chair yoga can be beneficial.
Nutrition
A healthy diet, rich in protein, is crucial in reversing muscle loss. Aim for 25-40 grams of protein per meal. Additionally, ensure you are consuming enough calories, as a deficiency can lead to weight loss and diminished muscle mass. Supplements such as omega-3 and creatine may also help.
Lifestyle Changes
Making lifestyle changes can help treat and reverse muscle loss. This includes increasing your overall physical activity, even outside of dedicated exercise sessions. Breaking up periods of inactivity throughout the day can help prevent muscle loss.
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Medical advice on muscle loss
Muscle atrophy is the thinning or loss of muscle tissue and mass. It is often caused by disuse of muscles, neurogenic conditions, nerve problems, or diseases. It can also be caused by malnutrition, age, genetics, or a lack of physical activity. If you have muscle atrophy, you may experience weakness, tingling, or numbness in your limbs. In the case of facial muscle atrophy, you may experience difficulty speaking or swallowing.
If you are experiencing muscle loss, you should contact your healthcare provider. They will perform a physical examination, ask about your medical history, and look at your arms and legs to measure muscle size. They may also recommend progressive resistance-based strength training or other forms of exercise to help rebuild muscle mass. It is important to note that muscle atrophy can often be reversed with exercise and better nutrition.
Sarcopenia is a specific type of muscle atrophy that is age-related and affects people as they grow older. It is characterized by a progressive loss of muscle mass, strength, and function, and can greatly impact one's quality of life by reducing the ability to perform daily tasks. Sarcopenia is typically treated through lifestyle changes, including physical activity and a healthy diet with increased protein intake.
It is important to consult a medical professional if you are experiencing any form of muscle loss to receive a proper diagnosis and treatment plan. They can help determine the underlying cause and recommend the best course of action to improve your muscle health.
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Frequently asked questions
There are several ways to check if you are losing muscle mass. One way is to monitor your body fat percentage to gauge how much fat you're losing against muscle mass. You can use body fat calipers to measure, in millimetres, how much fat you can pinch with your fingers in certain areas of the body. Another way is to use dual-energy X-ray absorptiometry (DXA) scans, which are an enhanced form of X-ray that captures data on weight, body fat, muscle mass and bone density.
Symptoms of muscle loss include muscle weakness, loss of stamina, difficulty performing daily activities, walking slowly, trouble climbing stairs, poor balance, falls, and a decrease in muscle size.
Muscle loss can be caused by several factors, including age, physical inactivity, diet, disease, and nerve damage. Sarcopenia, for example, is a type of muscle atrophy that is caused by the natural ageing process. Muscle atrophy can also be caused by disuse of muscles, which can be due to leading a sedentary lifestyle, malnourishment, or having health problems that limit movement. Neurogenic atrophy, on the other hand, is caused by nerve damage that affects the muscles' ability to contract.
