水中分娩为啥不痛?Why in-water childbirth is less painful?

　　水中分娩不痛?产痛源于宫缩时子宫缺血缺氧。水中分娩：1水的浮力使肌肉放松，减少紧张，利于血管扩张，2水温40℃，使血管扩张，加快血液循环，增加宫缩时子宫血供氧供!所以宫缩时子宫缺氧程度低， 时间短，产痛轻，时间短!

　　Why in-water childbirth is less painful?

　　The labour pain is caused by uterine ischemia and hypoxia during contractions.

　　In-water childbirth:

　　1 The buoyancy of water relaxes the muscles, reduces tension, and facilitates blood vessel expansion.

　　2 Water temperature is 40 °C, which causes blood vessels to dilate, accelerates blood circulation, and increases uterine blood oxygen supply during contractions! Therefore, the degree of hypoxia is low, and it lasts for a much shorter time, which lead to a lighter and shorter-period childbirth pain.