Why do you tremble with Burubles when you do 'pee'?

Immediately after I took a pill in the toilet, I did not feel cold separately, but my body might shiver trembling. It is a reaction that everyone feels on a daily basis, but Live Science is approaching why such a reaction will occur.

Why Do Some Of Us Shiver When We Pee?
https://www.livescience.com/63197-why-pee-shivers.html

There has never been a full-scale study on the reaction of "treating the body as a body trembles", and as of 2018 there are no peer-reviewed papers. The hypothesis commonly known at the present time is that it is close to the "trembling reaction when a person suddenly feels cold". When we do urinating, we expose the local part to the outside air below body temperature and then drain the urine warmed by body temperature from the local part with a great momentum. And it is thought that the body will tremble naturally because the body feels a sudden temperature change at the timing when the urine in the bladder (bladder) becomes empty.

However, Simon Fulford who is a urologist at the James Cook University Hospital in the UK believes that this response is a response derived from the animal's original struggle and escape reaction . "The process of urination is managed by the autonomic nervous system (ANS) which controls the function that automatically works in the body, such as body temperature and beating of the heart, and Mr. Fulford said that the intention of us to" give urine " Before I do, the parasympathetic nervous system (PNS) and the sympathetic nervous system (SNS) are working. "

When the urine in the bladder becomes full, the human body activates the sacral plexus which controls the nerve of the spinal cord. After this, the PNS contracts the bladder wall and prepares to discharge the urine. Mr. Fulford said, "When the urine in the bladder is full, when the bladder wall contracts, the human body slightly increases blood pressure, and blood pressure returns to the original at the same time as urination" and said urine discharge Explain that a phenomenon in which the blood pressure temporarily drops before and after it is explained.

When SNS feels temporary blood pressure lowering, it feels "fighting · escape response" as shown when an animal feels terror. "Because of this struggle and getaway reaction, people are unconsciously trembling their bodies," Mr. Fulford says.

Furthermore, it is thought that there is a tendency that men tend to be stronger than females, "to tremble after doing a piss" reaction. This is because there are many opportunities for men to keep urinating from women and there is a possibility that the posture saying "to stand up" strengthens blood pressure lowering and shows a stronger response.