Fitness knowledge: muscle centripetal, centrifugal, isometric contraction!

As a fitness enthusiast, do you find the words "centric contraction", centrifugal contraction, and static contraction when reading some fitness articles or some exercise knowledge?

　　What do these mean?

　　Some netizens see the word "heart" and think that actions close to the heart are called centrifugal contraction, and actions far away from the heart are called centrifugal contraction. Is this right? 　■ Concentric Muscle Action(Concentric Muscle Action)

　　When the muscle contraction force is greater than the impedance force of the external load, the muscle shortens, and the force generated by the muscle is greater than the force of the external load to stretch the muscle, such as the process of bending the biceps to lift the dumbbell.

　■ Muscle Centrifugal action(Eccentric Muscle Action)

　　The muscle contraction force is less than the impedance force of the external load, and the muscle is lengthened. At this time, the force generated by the muscle is less than the force of the external load to stretch the muscle. The downward stage of the action during weightlifting training is centrifugal contraction (the process of bending the biceps to lower the dumbbell)

　　In standard actions, the muscles apply centrifugal action to resist the gravity acceleration that causes the load to downward. Therefore, during centrifugal action, it is necessary to steadily resist the downward load rather than quickly lower the load.

　■ Isometric Muscle Action)

　When muscle contraction force is equal to the impedance force of the external load, the muscle length remains unchanged. At this time, the force generated by the muscle is equal to the force of the external load stretching tendon. Sitting up, the torso is rolled upwards by 45 degrees, and then it cannot be held back. At this time, the abdominal muscles are contracted in the same length. In contrast, when the upper body is rolled upwards, it is a centripetal effect; when the upper trunk is laying downwards, it is a centrifugal effect.

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