Logan Steele
Muscle deficiency, or muscle weakness, is a lack of muscle strength, meaning the muscles may not contract or move as easily as they used to. This can be caused by a variety of factors, including chronic conditions, acute infections, and medication side effects. In some cases, muscle weakness can be a sign of something serious, such as a stroke or multiple sclerosis, and requires immediate medical attention. Certain neuromuscular disorders, such as muscular dystrophy, can also lead to progressive muscle weakness and degeneration of skeletal muscles. Muscular dystrophy is a group of inherited diseases caused by changes in genes that produce proteins necessary for healthy muscles. It results in a loss of muscle strength, increasing disability, and possible deformity. Other causes of muscle weakness include electrolyte imbalances, diabetes, hypothyroidism, sleep disorders, and lack of physical activity.
| Characteristics | Values |
|---|---|
| Definition | Muscle weakness occurs when your full effort doesn't produce a normal contraction. |
| Causes | Muscle weakness can be caused by chronic conditions, acute infections, medications, stroke, multiple sclerosis, electrolyte imbalance, anemia, chronic fatigue syndrome, diabetes, fibromyalgia, hypothyroidism, kidney function problems, sleep disorders, lack of use, genetic disorders, muscular dystrophy, Charcot-Marie-Tooth disease, dermatomyositis, age-related atrophy, neurogenic atrophy, and more. |
| Symptoms | Challenges with movement, such as late walking, frequent falls, trouble rising from the floor, running, jumping, climbing stairs, and waddling gait. Large calf muscles, muscle pain and stiffness, learning or behavioral challenges, delayed growth, cardiac issues, breathing difficulties, swallowing disorders, and progressive loss of muscle function. |
| Diagnosis | Diagnosis of muscle weakness involves a physical exam, discussion of symptoms, observation of muscle mass, and possible blood tests, muscle or nerve biopsies, electromyography, nerve conduction studies, CT scans, and MRI scans. |
| Treatment | Treatment for muscle weakness includes physical therapy, range of motion exercises, stretching, pain relievers, thyroid hormone replacement, dietary changes, and assistive devices. |
| Prevention | Muscle weakness can be prevented by maintaining a healthy diet, staying physically active, and avoiding risk factors such as sedentary lifestyles, malnutrition, and certain medications. |
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What You'll Learn
Muscular dystrophy
There are over 30 types of muscular dystrophy, each resulting from a specific gene change unique to that type. The most common form, Duchenne muscular dystrophy (DMD), primarily affects young boys, causing symptoms such as delayed walking, frequent falls, muscle pain, and learning challenges. Becker muscular dystrophy (BMD) is the second most common type, typically affecting boys but with milder symptoms in girls. While BMD can manifest at any age, symptoms usually appear in the teenage years.
Another type of muscular dystrophy is Emery-Dreifuss muscular dystrophy (EDMD), which mainly affects male children and young adults. EDMD causes muscle weakness in the shoulders, upper arms, and shins, and can also impact the heart. Facioscapulohumeral muscular dystrophy (FSHD) commonly affects muscles in the face, shoulders, and upper arms, with weakness often more pronounced on one side of the body. Limb-girdle muscular dystrophy (LGMD) affects the upper arms, upper legs, shoulders, and hips, while oculopharyngeal muscular dystrophy (OPMD) weakens the muscles in the eyelids and throat.
Myotonic dystrophy, also known as Steinert's disease or dystrophia myotonica, is the most common type of muscular dystrophy diagnosed in adulthood. It affects both men and women, causing difficulty in relaxing muscles after use. Congenital muscular dystrophies (CMD) refer to a group of muscular dystrophies present at or near birth, causing overall muscle weakness and possible joint stiffness or looseness. Distal muscular dystrophy primarily impacts the hands, feet, lower arms, and lower legs.
While there is currently no cure for muscular dystrophy, medications and treatments can help manage symptoms and slow the progression of the disease. Organizations like the Muscular Dystrophy Association (MDA) in the United States aim to empower those affected by muscular dystrophy to live longer and more independent lives through research, care, and advocacy.
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Muscle atrophy
Pathologic atrophy is associated with aging, starvation, and specific diseases such as Cushing's disease, which can be caused by prolonged use of corticosteroids or overactive adrenal glands. Lastly, neurogenic atrophy is the most severe form of muscle atrophy, resulting from nerve injuries or diseases affecting the nerves connected to the muscles. This type of atrophy tends to occur more suddenly than physiologic atrophy and can be caused by conditions such as amyotrophic lateral sclerosis (ALS) or carpal tunnel syndrome.
The symptoms of muscle atrophy include decreased muscle mass, with one limb sometimes appearing smaller than the other. Individuals may also experience weakness, numbness, and tingling sensations in the affected limbs. In cases of facial or throat muscle atrophy, individuals may experience difficulty speaking or swallowing. Diagnosis of muscle atrophy involves a physical examination, assessment of symptoms, and various tests, including blood tests, muscle or nerve biopsies, and imaging scans.
While treatment options are currently limited, minimizing immobility is crucial in preventing muscle atrophy. Treatment approaches depend on the underlying cause and may include physical therapy, ultrasound therapy, surgery, and anabolic agents, although the latter are not frequently used due to potential side effects. For physiologic atrophy, exercise programs, particularly those performed in water, and improved nutrition can help reverse the condition.
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Chronic conditions and acute infections
Muscle weakness can be a symptom of many chronic conditions and acute infections. It can also be a side effect of certain medications.
Chronic Conditions
Chronic conditions that can cause muscle weakness include fibromyalgia, hypothyroidism, Addison's disease, anemia, chronic fatigue syndrome, rheumatoid arthritis, and lupus.
Fibromyalgia is a chronic condition that causes muscle pain and weakness, and these symptoms may worsen with exercise and physical activity. Hypothyroidism, or an underactive thyroid, can also cause muscle weakness and cramping, which may be treated with synthetic thyroid hormones. Addison's disease, caused by a deficiency in adrenal gland hormones, can also lead to muscle weakness. Anemia, resulting from low hemoglobin levels often due to iron deficiency, can cause muscle weakness. Chronic fatigue syndrome, also known as myalgic encephalomyelitis, is another chronic condition that can result in muscle weakness.
Rheumatoid arthritis is a chronic inflammatory autoimmune disorder that attacks the lining of the joints, causing pain and muscle weakness. Lupus, or systemic lupus erythematosus, is an inflammatory condition that can affect various body parts, including the joints, brain, heart, and lungs. Muscle weakness is a common symptom during lupus flare-ups.
Acute Infections
Acute infections that can lead to muscle weakness include the flu, Lyme disease, meningitis, HIV, polio, and rabies.
The flu virus and Lyme disease (transmitted by infected ticks) can both cause acute or chronic inflammatory responses, leading to muscle weakness. Meningitis is a severe infection causing inflammation in the brain and spinal cord, which can also result in muscle weakness. HIV, if untreated, can lead to progressive muscle weakness. Polio myositis causes muscle weakness and sensitivity, and post-polio syndrome can result in further muscle weakness. Rabies, transmitted through the saliva of infected animals, can also cause muscle weakness.
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Genetic factors
Muscle deficiency, or muscular dystrophy, refers to a group of more than 30 genetic conditions that cause muscle weakness and other symptoms. It is characterised by progressive muscle weakness and wasting, with a global incidence of approximately 1 in 5,000 individuals. The root cause of muscular dystrophy lies in mutations affecting genes responsible for muscle structure and function, resulting in the gradual degeneration and loss of muscle fibres.
Muscular dystrophy is caused by mutations in the genes that are responsible for healthy muscle structure and function. These mutations mean that the cells that normally maintain muscles can no longer do so, leading to progressive muscle weakness. There are several genes and possible genetic mutations that play a role in muscle function, which is why there are so many different forms of muscular dystrophy. These mutations can result in the accumulation of abnormal proteins in muscle cells, triggering inflammation and promoting muscle damage and degeneration.
The majority of muscular dystrophy cases are inherited, with the genetic mutation passed down from one or both biological parents. There are three ways in which muscular dystrophy can be inherited: recessive inheritance, dominant inheritance, and sex-linked (X-linked) inheritance. Recessive inheritance means that a person inherits a genetic mutation from both biological parents. Dominant inheritance means that a person only needs to inherit the mutated gene from one biological parent to develop the condition. Sex-linked inheritance occurs when a genetically male person has a mutation on their single X chromosome, as they have one X and one Y chromosome. As females have two X chromosomes, they may have X-linked disorders but are usually less severely affected.
In rare cases, muscular dystrophy can occur spontaneously due to a de novo mutation that was not inherited. While the specific genetic mutations causing muscular dystrophy may differ, the underlying mechanism of muscle degeneration and loss remains similar across all types of the disease. Early diagnosis, genetic testing, and appropriate management can help improve outcomes and quality of life for those affected by muscular dystrophy.
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Stroke
Muscle weakness can be a sign of a stroke, which is a life-threatening medical emergency that occurs when something prevents the brain from receiving enough blood flow. This can be due to a blocked blood vessel or bleeding in the brain, resulting in blood clots or broken vessels. Strokes are the second-leading cause of death worldwide and can cause permanent disabilities and changes in bodily functions.
Following a stroke, individuals often experience muscle weakness or hemiparesis, which is a significant decrease in muscle function. This can lead to difficulties in performing daily tasks and activities that require precise body movements. The mechanical properties of muscles are altered, resulting in varying levels of force generation when commanded by the nervous system. Factors such as increased stretch reflex excitability, antagonist muscle coactivation, and decreased motor-unit firing rates contribute to muscle weakness.
During the recovery process, physical therapy plays a vital role in preventing muscle stiffness and recommending exercises to address weakness on one side of the body. Over-the-counter pain relievers like ibuprofen can help manage pain, and occupational therapy can aid in adjusting to disabilities and improving motor skills.
It is essential to seek immediate medical attention if you or someone you know is experiencing stroke symptoms. The BE FAST acronym can help identify these symptoms, which include aphasia or trouble speaking. Every second counts in increasing the chances of survival and reducing the risk of permanent damage and disabilities.
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Frequently asked questions
Muscle deficiency, or muscle weakness, is a lack of muscle strength, meaning the muscles may not contract or move as easily as they used to.
Muscle weakness can be caused by a variety of factors, including chronic conditions, acute infections, certain medications, stroke, and genetic factors.
Symptoms of muscle deficiency can include difficulty with movement, such as walking, running, and climbing stairs. It can also cause muscle pain and stiffness, as well as breathing difficulties if the muscles involved in breathing are affected.
The treatment for muscle deficiency depends on the underlying cause. In some cases, physical therapy, exercise, and a healthy diet can help improve muscle strength. In other cases, medication or other treatments may be necessary to manage symptoms.
