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The sudden jerks and twitching of the body can often be so severe that it can cause a small child to fall. A myoclonic seizure (myo "muscle", clonic "jerk") is a sudden involuntary contraction of muscle groups. The muscle jerks consist of symmetric, mostly generalized jerks, localized in the arms and in the shoulders and also simultaneously ...
Myoclonic dystonia or Myoclonus dystonia syndrome is a rare movement disorder that induces spontaneous muscle contraction causing abnormal posture. The prevalence of myoclonus dystonia has not been reported, however, this disorder falls under the umbrella of movement disorders which affect thousands worldwide. [1]
Bernard was able to slow the car down to 50–60 mph (80–97 km/h) with the brakes, but was only able to bring the car to a complete stop after putting the car in neutral. [50] After this incident, Toyota conducted seven recalls related to unintended acceleration from September 2009 to March 2010.
To avoid vehicle passengers losing control over body motion and getting injured, it is necessary to limit the exposure to both the maximum force (acceleration) and maximum jerk, since time is needed to adjust muscle tension and adapt to even limited stress changes. Sudden changes in acceleration can cause injuries such as whiplash. [2]
The causes of hypnic jerk are yet unclear and under study. None of the several theories that have attempted to explain it have been fully accepted. [ 9 ] One hypothesis posits that the hypnic jerk is a form of reflex , initiated in response to normal bodily events during the lead-up to the first stages of sleep, including a decrease in blood ...
Symptoms include slow, uncontrolled movements of the extremities and trunk [24] and small, rapid, random and repetitive, uncontrolled movements known as chorea. [25] Involuntary movements often increase during periods of emotional stress or excitement and disappear when the patient is sleeping or distracted.
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Myoclonus is defined as a sequence of repeated, often nonrhythmic, brief, shock-like jerks due to sudden involuntary contraction or relaxation of one or more muscles. These movements may be asynchronous, in which several muscles contract variably in time, synchronous, in which muscles contract simultaneously, or spreading, in which several ...
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