Alec Titan
The human body is an intricate machine, boasting over 600 muscles that work tirelessly to keep us alive and moving. These muscles are soft tissues that perform two types of movements: voluntary and involuntary. While we often think of muscle as a sign of strength and physical fitness, they can also be a source of pain and discomfort, signalling a variety of conditions. From the familiar muscle soreness after a workout to the more insidious symptoms of muscular dystrophy and atrophy, it's important to recognize the signs our muscles give us and understand when to seek help.
| Characteristics | Values |
|---|---|
| Number of muscles in the body | More than 600 |
| Muscle movement | Voluntary and involuntary |
| Types of muscles | Skeletal muscle, cardiac muscle, and smooth muscle |
| Muscle pain | Myalgia |
| Muscle disease | Muscular dystrophy, muscle atrophy |
| Muscle atrophy symptoms | Reduced muscle mass, weakness, numbness, tingling, difficulty swallowing or speaking, facial weakness, memory loss |
| Muscle dystrophy symptoms | Progressive muscle weakness, inability to relax muscles, drooping eyelids, long thin faces, shoulder blades sticking out |
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What You'll Learn
- Muscular dystrophy: Progressive weakness and loss of muscle mass due to abnormal genes
- Myalgia: Muscle pain with many causes, usually temporary and treatable at home
- Muscle atrophy: Wasting or thinning of muscle mass due to disuse or neurogenic conditions
- Skeletal muscle: The most common type of muscle, comprising 30-40% of body mass, allowing movement
- Involuntary movements: Muscles work automatically to keep organs functioning, e.g., heart beating
Muscular dystrophy: Progressive weakness and loss of muscle mass due to abnormal genes
Muscular dystrophy (MD) is a group of genetic diseases that cause progressive weakness and degeneration of skeletal muscles. MD is characterised by abnormal genes (mutations) that interfere with the production of proteins required for healthy muscle formation. There are more than 30 forms of MD, each with a unique genetic mutation, and the diseases vary in age of onset, severity, and the pattern of affected muscles. MD can affect several body tissues and organs, but its primary feature is damage to the integrity of muscle fibres.
The root cause of MD lies in mutations affecting genes responsible for muscle structure and function, leading to the gradual degeneration and loss of muscle fibres. This loss of muscle fibres causes progressive muscle weakness and wasting, particularly in the proximal muscles of the lower limbs, pelvic girdle, and shoulders. The specific signs and symptoms of MD depend on the type of MD and typically begin in childhood, mostly in boys. However, other types of MD do not surface until adulthood. The most common variety, Duchenne MD, usually occurs in young boys, with symptoms including progressive weakness and muscle wasting, beginning in the upper legs and pelvis before spreading to the upper arms. Many children with Duchenne MD are unable to run or jump, and they may also experience enlarged calf muscles due to fat and connective tissue accumulation.
Other types of MD include:
- Limb-girdle MD, which affects the hip and shoulder muscles, causing difficulty in lifting the front part of the foot and resulting in frequent tripping.
- Myotonic MD, characterised by an inability to relax muscles following contractions, typically affecting the facial and neck muscles first. People with this form often have long, thin faces, drooping eyelids, and swan-like necks.
- Facioscapulohumeral (FSHD) MD, where muscle weakness begins in the face, hip, and shoulders, causing the shoulder blades to stick out like wings when the arms are raised.
- Congenital MD, which affects both boys and girls and is apparent at birth or before age 2.
While there is currently no cure for MD, medications and therapy can help manage symptoms and slow the disease's progression. MD is a debilitating condition that requires a comprehensive interprofessional plan of care to address the various aspects of an individual's health.
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Myalgia: Muscle pain with many causes, usually temporary and treatable at home
Myalgia is the medical term for muscle pain, which has numerous causes. It is usually temporary and not serious, but some chronic diseases can cause ongoing, widespread myalgia. Most types of muscle pain can be treated at home, but it is important to know when you need medical care.
Muscle pain can be caused by injuries, infections, or other health issues. It can be temporary or chronic, and its intensity varies from person to person. Everyone can experience muscle soreness, especially after exercise or when trying something new. Delayed-onset muscle soreness (DOMS) typically occurs 6 to 12 hours after exercise and may persist for up to 48 hours. During this time, you may experience pain as your muscles are recovering. Rest, elevation of the affected area, and applying cold or hot compresses can help reduce muscle soreness and improve blood circulation. Over-the-counter pain relievers, such as aspirin, acetaminophen, ibuprofen, and naproxen, can also help reduce pain and inflammation. Complementary therapies, such as massage, acupuncture, and meditation, can provide additional relief and relaxation.
In some cases, muscle pain may be a symptom of a more serious issue that requires professional care. Seek medical attention if your pain persists for more than a few days, worsens despite rest, or is accompanied by other symptoms such as fever, chest pain, muscle weakness, numbness, or loss of bladder control. Muscle pain can be a symptom of infectious, chronic diseases, and disorders, especially those that are inflammatory. It can also be a symptom of nutritional deficiencies, organ dysfunction, or, in rare cases, cancer. Blood tests, CT scans, MRIs, and electromyography (EMG) can help diagnose the underlying cause of muscle pain and determine the appropriate treatment.
Maintaining healthy muscles is crucial for preventing muscle pain. This includes getting regular physical activity, practising good posture, stretching regularly, and using correct lifting techniques. Nutrition also plays a vital role in muscle health, with Vitamin D being particularly important for ensuring muscles function correctly. Dehydration can also lead to muscle aches, so it is important to stay properly hydrated.
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Muscle atrophy: Wasting or thinning of muscle mass due to disuse or neurogenic conditions
Muscle atrophy, or muscle wasting, is a condition that causes a significant loss of muscle mass. It can be caused by disuse of muscles or neurogenic conditions. Disuse atrophy occurs when muscles are not used enough, which can be due to a sedentary lifestyle, old age, malnutrition, or certain illnesses or injuries that limit movement. This type of atrophy is reversible with exercise and a healthy diet.
Neurogenic atrophy, on the other hand, is caused by nerve problems or diseases that affect the nerves connecting to the muscles. When these nerves are damaged, they cannot trigger the muscle contractions needed to stimulate muscle activity. This type of atrophy tends to occur more suddenly than disuse atrophy and is considered the most severe form. Examples of conditions that can lead to neurogenic atrophy include amyotrophic lateral sclerosis (ALS), carpal tunnel syndrome, and polio.
Symptoms of muscle atrophy include a decrease in muscle mass, with one limb sometimes being smaller than the other. Other symptoms include numbness, weakness, and tingling in the limbs, as well as trouble walking or balancing, difficulty swallowing or speaking, and gradual memory loss. To diagnose muscle atrophy, a healthcare provider will perform a physical exam and may order additional tests such as blood tests, muscle or nerve biopsies, and imaging scans.
Treatment options for muscle atrophy depend on the individual case but may include physical therapy, nutritional intervention, or surgery. In some cases, muscle atrophy can be reversed with regular exercise and a healthy diet, especially for disuse atrophy. However, neurogenic atrophy may require more intensive treatment options.
Muscle atrophy is a serious condition that can significantly impact a person's quality of life and ability to perform daily tasks. It is important to seek medical advice if you notice any signs or symptoms of muscle atrophy to ensure prompt diagnosis and treatment.
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Skeletal muscle: The most common type of muscle, comprising 30-40% of body mass, allowing movement
Skeletal muscle, or striated muscle, is the most common type of muscle in the human body, comprising 30-40% of an individual's body mass. These muscles are voluntary, meaning that a person can control how and when they work. Skeletal muscles are attached to bones by tendons, which are tough connective tissues. These muscles allow for a wide range of movements and functions, such as chewing and swallowing, as well as expanding and contracting the chest cavity to enable breathing. They are made up of flexible muscle fibres that contract, allowing the muscles to move the bones.
Each skeletal muscle can contain thousands of fibres, ranging from less than half an inch to just over 3 inches in diameter. These fibres are surrounded by different types of sheaths or coverings, including the epimysium, perimysium, and endomysium. The epimysium is the outermost layer of tissue surrounding the entire muscle, while the perimysium forms the middle layer, surrounding bundles of muscle fibres. The endomysium is the innermost layer, enveloping individual muscle fibres. Skeletal muscle fibres are typically red or white in colour.
It is important to maintain the health and strength of skeletal muscles. They can be affected by muscle atrophy, which is the wasting or thinning of muscle mass. This condition can be caused by disuse of the muscles or neurogenic conditions that impact the nerves connected to the muscles. Symptoms of muscle atrophy include a decrease in muscle mass, with one limb appearing smaller than the other, as well as numbness, weakness, and tingling sensations in the limbs. Facial muscles may also be affected, leading to difficulty in speaking or swallowing.
Skeletal muscles can be maintained and strengthened through regular physical activity and a healthy diet. Certain conditions, such as muscular dystrophy, can also impact skeletal muscles, causing progressive weakness and loss of muscle mass due to abnormal gene interference with protein production. However, medications and therapy can help manage symptoms and slow the progression of such diseases.
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Involuntary movements: Muscles work automatically to keep organs functioning, e.g., heart beating
The human body has over 600 muscles that help us move, breathe, swallow, and stay alive. Some muscles are visible and can be felt, especially after a workout, while others, like the heart and the muscles that line some organs, are constantly working in the background to keep us alive.
Involuntary movements
Involuntary movements refer to body movements that occur without conscious effort. They are automatic movements that happen without us thinking about them. These movements may be mild, such as a slight eye twitch, or more pronounced, affecting the arms, trunk, or neck. Involuntary movements may be caused by several factors, including chronic diseases, medication side effects, nerve damage, brain injury, stroke, trauma, or lack of oxygen to the brain.
Involuntary movements can be further classified into several types:
- Tremors: Tremors are rhythmic oscillations caused by intermittent muscle contractions. They can affect the hands, head, or other parts of the body. Tremors may worsen when attempting basic movements.
- Tics: Tics are paroxysmal, stereotyped muscle contractions that can be simple or complex. They are commonly suppressible.
- Myoclonus: Myoclonus refers to shock-like, arrhythmic twitches that are not suppressible. When myoclonus affects a single muscle or group of muscles, it is known as focal myoclonus, while multifocal myoclonus affects several muscle groups. The most common type is cortical myoclonus, caused by an irregularity in the sensorimotor cortex part of the brain.
- Chorea: Chorea refers to dance-like, unpatterned movements that often approximate a purpose, such as adjusting clothes or checking a watch. They are often rapid and may involve proximal or distal muscle groups.
- Athetosis: Athetosis describes slow, writhing movements, typically affecting the arms and hands. It is associated with chronic conditions like cerebral palsy, Huntington's disease, and Wilson's disease.
- Dystonia: Dystonia involves sustained or repetitious muscular contractions that often result in abnormal postures.
- Hemiballismus: Hemiballismus refers to wild, large-amplitude, flinging movements on one side of the body, commonly affecting the proximal limb muscles but occasionally the trunk as well.
Involuntary movements, such as the beating of the heart and the movement of the chest and back muscles during breathing, are essential for keeping our organs functioning properly. These movements occur without our conscious control and are vital for maintaining the body's systems and functions.
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Frequently asked questions
Muscle atrophy is the wasting or thinning of muscle mass. Signs of muscle atrophy include a decrease in muscle mass, weakness, numbness, and tingling in the limbs. In some cases, it may also cause facial weakness and gradual memory loss.
Muscular dystrophy is a group of diseases that cause progressive muscle weakness and loss of muscle mass. Signs and symptoms vary depending on the specific type of muscular dystrophy, but may include difficulty lifting the front part of the foot, an inability to relax muscles following contractions, and progressive muscle weakness.
Muscle pain, or myalgia, is usually temporary and not serious. It commonly occurs after exercise or physical activity. However, widespread and long-lasting muscle pain can be a sign of an underlying condition and may require medical attention.
Muscle spasms, or cramps, are common and typically not serious. They can be painful and cause involuntary contractions and tightening of the muscles. While they can usually be treated at home, persistent or severe muscle spasms may be a symptom of an underlying medical condition and require medical attention.
