Often it is called a cramp.
A painful contraction of a muscle is a cramp or charley horse.
A painful muscle contraction is a cramp.
A sudden painful involuntary contraction of a muscle is called a muscle cramp. This can happen due to various reasons such as dehydration, muscle fatigue, or poor blood circulation. Stretching and massaging the affected muscle can help alleviate the discomfort.
Such a painful muscle contraction is commonly known as cramp.
A cramp is a sudden over-shortening of a muscle. Cramps are involuntary and, often, severe. They can be extremely painful.
constant contraction of a muscle is called the muscle tone
A muscle spasm caused by prolonged muscle contraction is called a "cramp." This localized involuntary contraction can be triggered by muscle fatigue, dehydration, or electrolyte imbalances. Cramps are usually sudden and can be painful, but they typically resolve on their own.
instant movement
a cramp or spasm.
It is called concentric isotonic contraction.
An involuntary muscle contraction is called a spasm.
Tetanus is a life-threatening disease with uncontrolled contraction of skeletal muscle (a sign known as tetany).