During strenuous exercise, the microstructure of muscle fibers is damaged. This damage breaks the homeostasis of calcium ions in the cell, causing necrosis. To eliminate this, macrophages are activated and their byproducts and structures in the cell are accumulated in the intercellular cortex. These substances accumulated in the intercellular cortex stimulate the sensory nerves of the muscles and cause pain. Muscle pain is more severe during extensional contraction (in which muscles are stretched) than during isotonic contraction (in which muscles are shortened with constant external resistance) or isometric contraction (in which muscle fibers are stretched). On the other hand, it is known that muscle pain is rarely caused during isokinetic (muscle contraction with the same joint angle moving at the same speed). 비앤비 여성전용아로마스웨디시 마사지