When only one impulse comes for one motor nerve, that is, the force of short contraction (單收縮) is only 1/3 to 1/5 of the force of the precipitation axis in the case of maximum effort. The maximum muscle strength is proportional to the cross-sectional area of the muscle fibers involved, but usually per 1㎢, people are 5-6kg, and frogs are 3-4kg. Energy is consumed when muscles contract. However, not all of the energy at this time becomes work, and more than 75% of it becomes heat. In the case of contraction, such as supporting weight, no work is done, so all energy is dissipated as heat. In this way, muscle contraction involves heat generation, so exercise warms the body. 비앤비 여성전용아로마스웨디시 마사지