What Is an Antagonist Muscle?

Antagonistic muscle is a part of human muscle, also known as antagonist muscle. It is a muscle that is located on the opposite side of the original muscle (active muscle) and relaxes and stretches at the same time as the original muscle (active muscle) contracts to complete the action.

Antagonistic muscle is a part of human muscle, also known as antagonist muscle. It is a muscle that is located on the opposite side of the original muscle (active muscle) and relaxes and stretches at the same time as the original muscle (active muscle) contracts to complete the action.
Chinese name
Antagonist muscle
Foreign name
antagonistic muscle
nickname
Antagonist muscle
Location
Opposite side

Antagonistic muscle function

For example, in completing the elbow flexion, the biceps and brachialis muscles are the prime movers. The triceps brachii muscles on the opposite side are relaxed and stretched at the same time. It is the antagonist muscle in the elbow flexion and vice versa. Antagonist muscles and motile muscles are opposite in form, but they are unified and coordinated in the function of orbiting the joint. For example, in completing the elbow flexion, it depends on the contraction of the flexor muscles, and at the same time, the proper relaxation and elongation of the extensor muscles must be matched. In fast movement, the antagonist muscle usually contracts at the end of the primary movement to prevent the excessive movement of the primary movement and make the movement accurate. In this sense, the coordinated relaxation of the antagonist muscle is an indispensable condition for the prime mover to complete a certain action, and the timely contraction of the antagonist muscle is also a guarantee for accurate completion of a certain action. When practicing a variety of movements, beginners often suffer from the difficulty in completing the movements due to the inability of the antagonist muscles to coordinate and relax. When a patient with severe cerebellar injury is active, the movement is always too high and incorrect, because the patient's antagonistic muscle excitement often does not occur in time at the end of the primary movement, and the braking action on the primary movement is lost. In sports health care, in order to reduce muscle spasm, relieve muscle soreness, and increase joint flexibility, the general method is to make the antagonist muscle contract strongly. Antagonistic muscle contraction and the cross-repressive reflex caused by antagonistic muscle contraction will maximize the relaxation of the spastic muscle.

Antagonist muscle active muscle, antagonist muscle conversion test

The subjects took a sitting position, with the trunk straight, the hips and knees held at 90 °, and the flexors and extensors of the elbow joints of the right upper limbs were the designated observation muscles. The exercise load test was performed on an experimental device made in our laboratory. The device consists of a fixed device that can be fixed on the wrist of the subject's load arm, a flexion / extension motion conversion device, a force sensor, and a corresponding load. Two days before the experiment, the subjects completed a maximum isometric elbow flexion and elbow extension force test on the device to determine the load of the subsequent exercise stress test. In the formal experiment, the subject first completed an equal-length elbow flexion fatigue test with a strength of 60% MVC, requiring the subject to maintain the elbow joint at 90 ° for as long as possible. After that, it quickly changed to the elbow extension fatigue test. The load strength of the elbow extensor was 60% of its maximum elbow extension force. The subjects were required to maintain the elbow joint at 90 ° for as long as possible. The durations of the elbow flexion and elbow extension fatigue tests were recorded separately for standardized processing of endurance scores.

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