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Muscle tone is the inherent ability of a muscle to respond to a stretch. A lack of muscle tone, or hypotonia, is often associated with reduced muscle strength and can be caused by malnutrition, ageing, genetics, physical inactivity, or certain medical conditions. This can lead to muscle atrophy, or the wasting and thinning of muscle mass, resulting in symptoms such as decreased muscle size and weakness in the limbs. Those with hypotonia may experience a range of issues, from motor skill delays and speech difficulties to more severe complications such as paralysis and fainting. The treatment for hypotonia often involves physical therapy and/or occupational therapy, with early intervention being key to improving long-term outcomes.
| Characteristics | Values |
|---|---|
| Muscle Tone | Low muscle tone or hypotonia is the amount of tension or resistance to stretch in a muscle. |
| Causes | Lack of muscle tone can be caused by malnutrition, age, genetics, a lack of physical activity, or certain medical conditions. |
| Symptoms | Muscle weakness, numbness or tingling in limbs, difficulty swallowing or speaking, motor skills delay, drooling, poor reflexes, decreased strength, decreased stamina, decreased activity tolerance, poor balance, and constipation. |
| Treatment | The principal treatment for most hypotonia is physical therapy and/or occupational therapy. |
| Types of Hypotonia | Central hypotonia originates from the central nervous system, while peripheral hypotonia is related to problems within the spinal cord, peripheral nerves, and/or skeletal muscles. |
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Muscle atrophy
The 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. Facial muscles may weaken, leading to difficulty speaking or swallowing. Atrophy of throat muscles can cause swallowing difficulties, while diaphragm atrophy can impair breathing. The symptoms depend on the cause and affected muscles.
Muscular dystrophy is a group of diseases causing muscles to weaken and lose mass over time due to changes in genes responsible for forming healthy muscles. It can lead to muscle stiffness, learning or behavioural challenges, and delayed growth. Myotonic muscular dystrophy affects the ability to relax muscles voluntarily, often starting with facial and neck muscles. It can progress to affect the heart and breathing muscles. Facioscapulohumeral muscular dystrophy causes weakness in the face, shoulders, and upper arms, often affecting one side more than the other.
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Muscular dystrophy
Duchenne muscular dystrophy (DMD) is the most prevalent form, predominantly affecting boys, although girls can exhibit milder symptoms. DMD affects the heart and lungs as it progresses. Becker muscular dystrophy (BMD) is the second most common type, typically affecting boys but also manifesting in girls with milder symptoms. BMD symptoms can emerge anytime between ages 5 and 60 but usually appear during teenage years.
Another type is Emery-Dreifuss muscular dystrophy (EDMD), which primarily affects male children and young adults. EDMD causes muscle weakness in the shoulders, upper arms, and shins, and it can also impact the heart. Facioscapulohumeral muscular dystrophy (FSHD) commonly affects the face, shoulders, and upper arms, with symptoms typically appearing before age 20. Limb-girdle muscular dystrophy (LGMD) affects the upper arms, upper legs, shoulders, and hips and can manifest at any age. Oculopharyngeal muscular dystrophy (OPMD) weakens the eyelids and throat muscles, causing droopy eyelids and swallowing difficulties, with symptoms often appearing in middle age.
Myotonic dystrophy, the most common adult-onset form, affects both men and women equally. People with this type of muscular dystrophy experience difficulty relaxing their muscles after use. The condition can impact the heart, lungs, and endocrine system, leading to issues such as thyroid disease and diabetes. Congenital muscular dystrophies (CMD) refer to a group of muscular dystrophies present at or near birth, causing overall muscle weakness, joint stiffness or looseness, spinal curvature, breathing issues, intellectual disabilities, eye problems, or seizures. Distal muscular dystrophy affects the hands, feet, lower arms, and lower legs.
While the term "lack of muscle tone" was not explicitly mentioned in the context of muscular dystrophy, the condition is characterised by muscle weakness and loss of muscle mass, which could be associated with a decrease in muscle tone. Additionally, muscle atrophy, which is the wasting or thinning of muscle mass, can be a symptom or complication of muscular dystrophy. This atrophy can lead to a decrease in muscle mass, weakness, and numbness in the limbs.
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Hypotonia
The underlying causes of hypotonia can vary and may include chromosomal disorders, inborn errors of metabolism, cerebral dysgenesis, or trauma to the brain and spinal cord. Metabolic causes can include glycogen storage disease type II, pyruvate dehydrogenase deficiency, mitochondrial disease, and congenital disorders. Genetic disorders such as Down syndrome can also present within the first six months of life.
While hypotonia itself is not a specific medical disorder, it can be a manifestation of various diseases and disorders that affect motor nerve control by the brain or muscle strength. Central hypotonia originates from the central nervous system, while peripheral hypotonia is related to problems within the spinal cord, peripheral nerves, or skeletal muscles.
The treatment for hypotonia depends on the underlying cause and the patient's age, overall health, and medical history. Physical therapy and occupational therapy are common treatments for hypotonia of idiopathic or neurologic causes. Early intervention is crucial for improving symptoms over time, and specific treatments are determined by the physician based on the individual case.
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Neurological conditions
While muscle atrophy, the wasting or thinning of muscle mass, can cause weakness in the limbs, it is not commonly associated with shakiness. However, neurological conditions can cause shakiness or tremors. These involuntary, rhythmic muscle contractions can be categorised as resting or action tremors. Resting tremors occur when the muscles are relaxed, while action tremors occur when the muscles are contracted due to voluntary movement.
Multiple Sclerosis (MS)
MS damages areas in the pathways of the central nervous system that control movement, resulting in tremors. About 75% of people with MS experience some degree of tremor.
Parkinson's Disease (PD)
Parkinson's disease is associated with tremors, which can affect the hands, chin, lips, face, and legs. The tremors are often more pronounced during periods of stress or strong emotion. Rest tremors are common in people with Parkinson's disease.
Traumatic Brain Injury (TBI)
Tremors can occur as a consequence of a traumatic brain injury, known as post-traumatic tremor (PTT).
Essential Tremor
Essential tremor is one of the most common movement disorders, typically affecting both hands and arms but can also involve the head, voice, or lower limbs. It can be inherited and may start at any age but usually appears during adolescence or middle age.
Orthostatic Tremor
A rare disorder characterised by rapid muscle contractions in the legs when a person stands up. It can be felt in the thighs or calves but may not be visible to the naked eye. The cause is unknown.
Myotonic Dystrophy
This type of muscular dystrophy affects the muscles' ability to relax at will. It often starts between the ages of 20 and 30, impacting the facial and neck muscles first. As the disease progresses, it can lead to heart rhythm issues and weaken the muscles involved in breathing.
Friedreich's Ataxia
An inherited disease resulting from a lack of frataxin in mitochondria, leading to oxidative stress and sclerosis of the spinal cord. It causes a loss of coordination and typically appears in early childhood.
Other Conditions
Other neurological conditions that can cause shakiness include Guillain-Barré syndrome, Erb palsy, and Dejerine-Sottas syndrome. Additionally, certain drugs, alcohol withdrawal, an overactive thyroid, and hypoglycemia can also lead to shakiness or tremors.
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Ageing
Sarcopenia can significantly impact an individual's quality of life, making basic daily activities challenging. For example, those affected by sarcopenia may struggle with tasks such as getting out of chairs, opening jars, or carrying groceries. In severe cases, the condition may lead to a need for full-time care.
The development of sarcopenia is influenced by various factors related to ageing. One key factor is a reduction in nerve cells responsible for transmitting signals from the brain to the muscles, initiating movement. Ageing also leads to lower levels of hormones, including testosterone, growth hormone, and insulin-like growth factor, which contribute to muscle maintenance and growth. Additionally, the body finds it harder to convert protein into energy as we age, further impacting muscle health.
Inactivity is a significant risk factor for sarcopenia. Older adults tend to spend more time sitting or lying down, contributing to muscle loss. A sedentary lifestyle, combined with a poor diet, can accelerate muscle atrophy. Specifically, a diet lacking sufficient calories, protein, vitamins, and minerals can increase the risk of muscle atrophy.
To mitigate the effects of ageing on muscle tone, staying active is crucial. Resistance exercises, such as using resistance bands, lifting weights, and calisthenics (e.g., squats, push-ups, and sit-ups), are particularly effective in improving muscle strength. Additionally, consuming adequate calories and high-quality protein can slow down muscle loss. Omega-3 fatty acids and creatine supplements may also promote muscle growth and strength.
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Frequently asked questions
Hypotonia is a state of low muscle tone, often involving reduced muscle strength. It is not a specific medical disorder but a potential symptom of many different diseases and disorders that affect motor nerve control by the brain or muscle strength.
Hypotonic patients may experience a variety of symptoms, including motor skills delay, hypermobile joints, drooling, speech difficulties, poor reflexes, decreased strength, decreased activity tolerance, and poor attention.
Low muscle tone can be caused by a variety of factors, including muscle atrophy, malnutrition, age, genetics, physical inactivity, and certain medical conditions.
Muscle atrophy is the wasting or thinning of muscle mass due to disuse or neurogenic conditions. It can lead to a decrease in muscle mass, numbness, weakness, and tingling in the limbs.
Yes, low muscle tone can lead to decreased muscle strength and coordination, which may result in shakiness or tremors.
