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Muscle hypertonicity, or hypertonia, is a condition in which there is too much muscle tone, causing stiffness and difficulty moving the affected body parts. It is caused by upper motor neuron lesions, which may be the result of injury, disease, or conditions that involve damage to the central nervous system. Hypertonia can also be caused by resistance to externally imposed movement, which increases with the speed of stretch and the direction of joint movement. It is often observed in patients with neurological conditions such as post-stroke spasticity or Parkinson's disease, as well as in rheumatologic and physiatric practices.
| Characteristics | Values |
|---|---|
| Cause | Upper motor neuron lesions |
| Occurrence | When the regions of the brain or spinal cord that control signals to the muscles are damaged |
| Damage cause | Blow to the head, stroke, brain tumours, toxins that affect the brain, neurodegenerative processes, neurodevelopmental abnormalities |
| Symptoms | Muscle stiffness, uncontrollable muscle spasms, muscle contractions, abnormal muscle tone, rigidity, dystonia |
| Detection | Electromyography (EMG) |
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What You'll Learn
- Muscle hypertonicity is caused by upper motor neuron lesions
- Hypertonicity can be caused by injury, disease, or conditions that damage the central nervous system
- Hypertonicity is associated with neurological conditions such as Parkinson's disease
- Hypertonicity can be caused by a blow to the head
- Hypertonicity can be caused by toxins that affect the brain
Muscle hypertonicity is caused by upper motor neuron lesions
Muscle hypertonicity (MHT) is generally believed to be either an associated or secondary consequence of various pain-generating or other underlying abnormalities. It is caused by upper motor neuron lesions which may result from injury, disease, or conditions that involve damage to the central nervous system. The lack of or decrease in upper motor neuron function leads to a loss of inhibition with resultant hyperactivity of lower motor neurons. Different patterns of muscle weakness or hyperactivity can occur based on the location of the lesion, causing a multitude of neurological symptoms, including spasticity, rigidity, or dystonia.
Spastic hypertonia involves uncontrollable muscle spasms, stiffening or straightening out of muscles, shock-like contractions of all or part of a group of muscles, and abnormal muscle tone. Hypertonia happens when the regions of the brain or spinal cord that control these signals are damaged. This can occur for many reasons, such as a blow to the head, stroke, brain tumours, toxins that affect the brain, neurodegenerative processes such as multiple sclerosis or Parkinson's disease, or neurodevelopmental abnormalities such as cerebral palsy.
In rheumatologic and physiatric practices, MHT may also be observed in patients with pericranial and cervical muscle stiffness of tension-type headache (TTH) or associated with other painful syndromes of the neck and shoulders. Increased trapezius muscle hardness or tightness has been observed in TTH patients compared with that in control patients. Among juveniles and young adults, phenotypic variations in muscular hypertonicity are known to affect various regions of the body, e.g. hamstring tightness. Increased tonus may be related to the individual’s body build, gender, or degree of flexibility training.
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Hypertonicity can be caused by injury, disease, or conditions that damage the central nervous system
Hypertonicity, or hypertonia, is a condition in which there is too much muscle tone, causing stiffness and difficulty moving the arms and legs. It is caused by upper motor neuron lesions, which can be the result of injury, disease, or conditions that damage the central nervous system.
Hypertonia happens when the regions of the brain or spinal cord that control signals to the muscles are damaged. This can occur due to a blow to the head, stroke, brain tumours, toxins that affect the brain, neurodegenerative processes such as multiple sclerosis or Parkinson's disease, or neurodevelopmental abnormalities such as cerebral palsy.
In neurological practice, hypertonicity is recognised as occurring in various pathological conditions, such as post-stroke spasticity or rigidity in Parkinson's disease. It may also be observed in patients with pericranial and cervical muscle stiffness associated with tension-type headache (TTH) or other painful syndromes of the neck and shoulders. Increased trapezius muscle hardness or tightness has been observed in TTH patients compared to control patients.
Among juveniles and young adults, phenotypic variations in muscular hypertonicity can affect various regions of the body, such as hamstring tightness. Increased tonus may be related to an individual's body build, gender, or degree of flexibility training. Athletic coaches and directors have expressed concerns that sports injuries can be increased when overloaded muscles are either too tight or insufficiently strengthened.
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Hypertonicity is associated with neurological conditions such as Parkinson's disease
Hypertonicity, or hypertonia, is a condition in which there is too much muscle tone, causing stiffness and difficulty moving the affected body parts. It is caused by upper motor neuron lesions, which can be the result of injury, disease, or conditions that damage the central nervous system.
In addition to Parkinson's disease, hypertonicity is also recognised in neurological practice as occurring in other pathological conditions. For example, post-stroke spasticity or rigidity is often observed in patients with Parkinson's disease. Similarly, in rheumatologic and physiatric practices, muscular hypertonicity may be observed in patients with pericranial and cervical muscle stiffness associated with tension-type headaches or other painful syndromes of the neck and shoulders.
The presence of hypertonicity can be detected by electromyography (EMG), which measures actively contracted muscle stiffness. However, proper clinical evaluation techniques can also be used to assess passive tonus without the need for concurrent EMG monitoring. Among juveniles and young adults, phenotypic variations in muscular hypertonicity can affect various regions of the body, such as hamstring tightness. Increased tonus may be related to factors such as body build, gender, or the degree of flexibility training an individual undertakes.
Furthermore, athletic coaches and directors have expressed concerns that overloaded muscles that are either too tight or insufficiently strengthened can increase the risk of sports injuries. Therefore, understanding and managing hypertonicity is essential for optimising athletic performance and preventing injuries.
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Hypertonicity can be caused by a blow to the head
Hypertonicity, or hypertonia, is a condition in which there is too much muscle tone, causing stiffness and difficulty moving. It is caused by upper motor neuron lesions, which may result from injury, disease, or conditions that involve damage to the central nervous system.
The effects of hypertonicity can vary depending on the location of the lesion. For example, spastic hypertonia involves uncontrollable muscle spasms, stiffening, or straightening out of muscles, shock-like contractions of all or part of a group of muscles, and abnormal muscle tone. Dystonia, another form of hypertonicity, is characterised by sustained or intermittent muscle contractions that cause abnormal, often repetitive, movements and postures.
In addition to blows to the head, hypertonicity can also be caused by other factors such as resistance to externally imposed movement, particularly at high speeds or joint angles. Among juveniles and young adults, phenotypic variations in muscular hypertonicity can affect various regions of the body, and may be related to body build, gender, or degree of flexibility training. Athletic coaches have expressed concerns that overloaded muscles that are too tight or insufficiently strengthened can increase the risk of sports injuries.
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Hypertonicity can be caused by toxins that affect the brain
Hypertonicity, or hypertonia, is a condition in which there is too much muscle tone, causing stiffness and difficulty moving the affected body parts. It is caused by upper motor neuron lesions, which can result from injury, disease, or conditions that involve damage to the central nervous system. This includes the brain and spinal cord.
Toxins that affect the brain can cause hypertonicity by disrupting the normal functioning of the brain and spinal cord, leading to a loss of inhibition and resultant hyperactivity of lower motor neurons. This can cause different patterns of muscle weakness or hyperactivity, depending on the location of the lesion. For example, spastic hypertonia involves uncontrollable muscle spasms, muscle stiffening or straightening, shock-like contractions of all or part of a group of muscles, and abnormal muscle tone.
The presence of toxins in the brain can also contribute to other pathological conditions associated with hypertonicity, such as post-stroke spasticity, rigidity in Parkinson's disease, pericranial and cervical muscle stiffness associated with tension-type headache, and other painful syndromes of the neck and shoulders.
In addition to toxins, other factors that can increase the risk of hypertonicity include resistance to externally imposed movement, particularly at high speeds or joint angles, and fixed postures, although this is usually only seen in severe cases. Among juveniles and young adults, phenotypic variations in muscular hypertonicity can also affect various regions of the body, such as hamstring tightness.
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Frequently asked questions
Muscle hypertonicity is when there is too much muscle tone, causing stiffness and difficulty moving.
Muscle hypertonicity is caused by upper motor neuron lesions, which can be the result of injury, disease or conditions that involve damage to the central nervous system.
Symptoms include uncontrollable muscle spasms, stiffening or straightening out of muscles, shock-like contractions of all or part of a group of muscles, and abnormal muscle tone.
Treatment for muscle hypertonicity can include physical therapy, medication, and in some cases, surgery.
