Dominic Stone
Muscle atrophy, or the wasting and thinning of muscle mass, can be caused by several factors, including malnutrition, ageing, genetics, lack of physical activity, and certain medical conditions. Physiologic atrophy, for example, is caused by not using muscles enough, while neurogenic atrophy is caused by nerve problems or diseases. Age-related muscle loss, called sarcopenia, is a natural part of ageing, but it can be accelerated by injury, illness, or prolonged periods of inactivity. The good news is that muscle loss can often be reversed through physical therapy, strength training, cardio, flexibility exercises, and improved nutrition, particularly increased protein intake.
| Characteristics | Values |
|---|---|
| Type | Physiologic (Disuse) atrophy, Pathologic atrophy, Neurogenic atrophy |
| Causes | Not using muscles enough, ageing, starvation, diseases, nerve problems, stroke, osteoarthritis, sedentary lifestyle, malnutrition, injury, illness, genetic disorders |
| Symptoms | Decrease in muscle mass, weakness, poor balance, frailty, numbness, difficulty swallowing or speaking, trouble walking |
| Treatments | Physical therapy, ultrasound therapy, surgery, strength training, cardio, flexibility exercises, nutrition plan with more protein and calories |
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Muscle atrophy
Physiologic atrophy, also known as disuse atrophy, is the most common type and is caused by a lack of physical activity or sedentary lifestyle. This can occur due to prolonged periods of inactivity during illness or injury recovery, certain medical conditions such as osteoarthritis, or simply not using the muscles enough. The good news is that physiologic atrophy can often be reversed through regular exercise, physical therapy, and improved nutrition.
Pathologic atrophy is often associated with aging, starvation, and diseases such as Cushing's disease, hypothyroidism, or conditions causing overactive adrenal glands. Malnutrition and certain medications can also contribute to pathologic atrophy. Nutritional therapy and medical treatment of the underlying condition are crucial in addressing this type of atrophy.
Neurogenic atrophy is the most severe form of muscle atrophy and is caused by nerve injuries or diseases affecting the nerves that connect to the muscles. Conditions such as amyotrophic lateral sclerosis (ALS), muscular dystrophy, or nerve injuries due to trauma or surgery can lead to neurogenic atrophy. Treatment options for neurogenic atrophy may include physical therapy, ultrasound therapy, or, in some cases, surgery.
It is important to note that muscle atrophy can have various symptoms, including reduced muscle mass, weakness, numbness or tingling in the limbs, and difficulty with balance or performing physical tasks. The treatment for muscle atrophy depends on the underlying cause and may involve exercise, nutritional interventions, and addressing any medical conditions contributing to the atrophy.
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Malnutrition
Muscle atrophy, or the wasting and thinning of muscle mass, can be caused by several factors, one of which is malnutrition. Malnutrition refers to undernutrition, or a deficiency of nutrients. It can be caused by an inadequate diet or the body's inability to absorb nutrients from food. This can lead to a deficiency in macronutrients (proteins, carbohydrates, and fats) and micronutrients (vitamins and minerals).
Undernutrition can cause visible wasting of fat and muscle, resulting in muscle atrophy. This is because the body needs these macronutrients to produce energy and maintain itself. When these are lacking, the body begins to break down tissues and shuts down non-essential functions to conserve energy. Malnutrition is, therefore, a major risk factor for skeletal muscle loss, which can contribute to the onset of sarcopenia, a condition characterized by age-related muscle atrophy.
The effects of malnutrition on muscle wasting can be combated through lifestyle interventions such as good nutrition and physical exercise. Early identification of malnutrition in high-risk populations is crucial, as it can help prevent muscle mass and strength loss. Nutritional assessment, along with muscle mass measurements, can be used to tailor interventions and preserve muscle mass and function.
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Lack of exercise
Muscle atrophy, or muscle wasting, is the loss or thinning of muscle tissue. It can be caused by a variety of factors, including a lack of physical activity or exercise. Sedentary lifestyles or desk jobs can lead to this type of muscle atrophy, known as disuse, physiologic, or inactivity atrophy. When muscles are not used enough, the body breaks them down to conserve energy, leading to a decrease in muscle size and strength.
Physiologic atrophy can occur rapidly, even within 14 days of reduced physical activity. This can lead to weight gain as muscle cells shrink and fat cells expand, burning fewer calories. Over time, this can cause overall weakness, poor balance, and frailty, impacting daily tasks and quality of life.
Disuse atrophy is often reversible with regular exercise and physical therapy. A comprehensive program including strength training, cardio, flexibility exercises, and a nutritious diet with adequate protein and calories can help rebuild lost muscle mass and improve overall health. Swimming and water exercises are particularly beneficial as they reduce the muscle workload during rehabilitation.
It is important to note that muscle atrophy can also be caused by other factors such as malnutrition, age, genetics, nerve injuries, or certain medical conditions. Seeking advice from a healthcare professional is recommended to determine the underlying cause and develop an appropriate treatment plan for muscle atrophy.
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Ageing
Muscle loss is a natural part of the ageing process, typically beginning in our 30s and progressing from there. This loss of muscle mass and strength is known as sarcopenia, from the Greek "sarco" meaning flesh, and "penia" meaning deficiency. It is estimated that those aged between 60 and 70 have lost around 12% of their muscle mass, with those over 80 losing up to 30%. Sarcopenia can seriously impact an individual's quality of life, making everyday activities such as walking, cleaning, and even dressing difficult. It can also lead to dangerous falls, resulting in injury, disability, or even death.
There are several factors that contribute to sarcopenia. One of the most significant is inactivity. The more time spent being sedentary, the more muscle mass and strength are lost. This can become a vicious cycle, as the loss of muscle strength further hinders an individual's ability to be physically active. In addition to inactivity, poor diet is also a risk factor for sarcopenia. As people age, their eating habits may change, leading to insufficient calorie, protein, vitamin, and mineral intake, all of which are essential for maintaining muscle mass. Nutritional deficiencies can result in weight loss and diminished muscle mass.
Hormonal changes that occur during the ageing process may also contribute to muscle loss. For example, testosterone, a potent anabolic steroid, decreases with age, and this can impact muscle growth and strength. Additionally, the body's ability to turn protein into energy decreases with age, which may further contribute to muscle loss.
While sarcopenia is a common condition, it is not an inevitable part of ageing. Staying active and incorporating strength training and resistance exercises can help prevent and even reverse muscle loss. Simple exercises like walking, or using resistance bands and weights, can help to maintain and build muscle mass. Nutrition also plays a crucial role, and ensuring adequate calorie and protein intake can slow down the rate of muscle loss. Omega-3 fatty acids have been shown to increase muscle growth at any age, and when combined with resistance training, may further increase muscle strength.
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Neurological conditions
Muscle atrophy, or wasting, can be caused by neurological conditions. Neurological conditions that cause muscle atrophy include neuromuscular disorders and muscular dystrophy.
Neuromuscular Disorders
Neuromuscular disorders affect the nerves that control voluntary muscles and those that communicate sensory information to the brain. When nerve cells become unhealthy or die, communication between the nervous system and muscles breaks down, and muscles weaken and waste away. There are many types of neuromuscular disorders, and treatment by an experienced multidisciplinary team is vital.
Muscular Dystrophy
Muscular dystrophy is a group of inherited diseases that cause muscles to become weaker and lose mass over time. It is caused by changes in the genes that make proteins needed to form healthy muscles. There are over 30 types of muscular dystrophy, and symptoms vary depending on the type. The most common type is Duchenne muscular dystrophy, which can be associated with autism spectrum disorder, ADHD, obsessive-compulsive disorder, and anxiety. Other types include Emery-Dreifuss muscular dystrophy, which causes certain joints to become stiff, and myotonic dystrophy, which affects the muscles' ability to relax. Muscular dystrophy can be difficult to diagnose, as some individuals may exhibit symptoms without carrying any of the currently recognized genetic mutations.
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Frequently asked questions
A:
There are many reasons why your muscles may be disappearing, including physiologic atrophy, pathologic atrophy, and neurogenic atrophy. Physiologic atrophy is caused by not using your muscles enough, which can be due to a sedentary lifestyle, malnourishment, or certain medical conditions. Pathologic atrophy is often seen with aging, starvation, or diseases such as Cushing's disease. Neurogenic atrophy is caused by an injury or disease affecting the nerves that connect to your muscles.
A:
Physiologic atrophy, also known as disuse atrophy, is when your muscles start to waste away due to lack of use. This can be caused by a sedentary lifestyle, certain medical conditions, or not getting enough exercise.
A:
Pathologic atrophy is often associated with aging, starvation, or certain diseases. It is a type of muscle atrophy that can cause a rapid decrease in muscle mass.
A:
Neurogenic atrophy is caused by an injury or disease that affects the nerves connected to your muscles. When these nerves are damaged, they can no longer trigger the muscle contractions needed to stimulate muscle activity, leading to muscle wasting.
A:
To prevent muscle atrophy, it is important to maintain a healthy diet that includes enough protein and calories. Regular exercise, including strength training and cardio, can also help prevent and reverse muscle loss. For older adults, it is recommended to focus on exercises that can be done safely and consistently, and to consider working with a trainer to create a specialized plan.
