cause
① Cold stimulation. For example, exercising in a cold environment in winter. Insufficient preparation activities; The swimming water temperature is low in summer, which easily leads to leg cramps. If you don't cover the quilt when you sleep at night, the calf muscles will be stimulated by cold, which will make people wake up.
② The muscles continue to contract too fast. During strenuous exercise, the whole body is in a state of tension, the leg muscles contract too fast, the relaxation time is too short, the local metabolite lactic acid increases, and the contraction and relaxation of muscles are difficult to coordinate, thus causing calf muscle spasm.
3 excessive sweating. Exercise for a long time, exercise a lot, sweat a lot, and can't replenish salt in time. A large number of fluids and electrolytes are lost in the body, metabolic wastes are accumulated, local blood circulation of muscles is not good, and spasms are also prone to occur.
4 excessive fatigue. When traveling long distances, climbing mountains, and climbing mountains, the calf muscles are most prone to fatigue. Because every time I climb a mountain, I support my whole body weight with one foot. The muscles of this leg need six times the weight of a person to lift the foot. When it is tired to a certain extent, it will have convulsions.
⑤ Calcium deficiency. Calcium ion plays an important role in muscle contraction. When the concentration of calcium ion in blood is too low, muscles are easily excited and twitched. Teenagers grow rapidly and are prone to calcium deficiency, so leg cramps often occur.
6. Bad sleeping posture. If you lie on your back for a long time, press the quilt on your feet, or lie prone for a long time, so that your feet are close to the bed, forcing some muscles of your calf to be in an absolute relaxed state for a long time, resulting in "passive contracture" of the muscles.
⑦ Frequent occurrence may be related to vascular diseases.