徒手潜泳是一种不带任何器材,将整个身体潜入水中或水底所进行的憋气游泳运动。这种潜泳具有水下打捞、寻物、拯溺等多种用途,因而它在生产、军事以及援救溺者等方面的实用价值较大。随着社会的发展和游泳人口的增多,潜泳已从一门实用游泳逐渐成为一种大众化的休闲潜水活动。不少人在游泳时喜欢潜入水底游上一会儿,而且无论是在泳池,还是在海滨浴场时常会有人从事徒手潜泳活动。然而在进行潜泳时,水中或水底的物理变化会直接或间接地影响人的生理而产 Snorkelling is a kind of breathless swimming exercise without any equipment, diving the whole body into the water or the bottom. This kind of diving swimming has many uses such as underwater salvage, searching for objects and saving lives, so it has great practical value in production, military and rescue of the drowning. With the development of society and the increase of swimming population, diving swimming has gradually become a popular recreational diving activity from a practical swimming. Many people like to sneak into the water when swimming for a while, and whether it is in the swimming pool, or at the beach are often engaged in snorkelling. However, during the snorkeling, the physical changes in the water or underwater will directly or indirectly affect human physiology