The main factors affecting the contraction of skeletal muscle are as follows: 1, related to the strength of the stimulus signal, that is, the patient’s own willingness to move is directly related, if the patient wants to move strongly somewhere, it will make the skeletal muscle receive a significant increase in the strength of the stimulus signal, then the skeletal muscle will obviously contract, and vice versa; 2, related to the contraction capacity of the skeletal muscle itself, if the patient’s own skeletal muscle If the patient’s own skeletal muscle contraction ability is stronger, that is, if the muscle is stronger, the skeletal muscle contraction will be correspondingly stronger, and vice versa; 3, related to fatigue, if the skeletal muscle has been very fatigued, its contraction ability will be greatly reduced; 4, related to the internal electrolyte level, if the patient’s body has electrolyte disorder, the muscle contraction ability will be greatly reduced, and if the electrolyte level is stable, the skeletal muscle will be at its best. If the electrolyte level is stable, the skeletal muscle will be in the best working condition; 5, related to the patient’s load, if the patient has to carry out some large load activities, the skeletal muscle will often make a stronger contraction, of course, this is only within a certain range.