I've never heard of hyperventilation being dangerous after swimming, but it is dangerous before swimming.
You know when you hold your breath and you feel a strong urge to breathe? This is called the pressure to breathe and it happens before you are actually in danger of running out of oxygen. Your body monitors the level of carbon dioxide (not the level of oxygen) in your blood to decide when to breathe - when it builds up, you feel the pressure to breathe.
By hyperventilating, you can clear more carbon dioxide out of your blood than you do with normal breathing. This mean that you can stay underwater for longer without feeling the pressure to breathe. The dangerous part is that you can run low on oxygen before your carbon dioxide levels get high enough to trigger the pressure to breathe - so you could be swimming along, feeling fine, and suddenly you don't have enough oxygen.
A lot of kids died this way doing diving contests in quarry swimming holes - if you don't have time to get to the surface when your body belatedly realizes that you need to breathe, you can drown.
According to folk wisdom, hyperventilating will increase the oxygen saturation of the blood, allowing for a longer supply of oxygen to the body. In fact, the blood should always be fully saturated when breathing normally in a standard atmosphere.
What hyperventilating does do is cause expulsion of excess carbonic acid from the blood, raising the pH of the blood. This in turn suppresses the urge to breathe. So while hyperventilating does not give you one more second of usable oxygen, it does make you more comfortable with not breathing. In extreme cases, it can make you so relaxed, that you black out from lack of oxygen without realizing it. If you're underwater at the time, this is bad.
Free-divers and competitive apneists are trained to recognize the signs of low blood oxygen (dizziness, loss of peripheral vision, etc).
Because when you take many small breaths before holding your breath, your body can't expell excess amounts of CO2 which can build up and increase the risk of oxygen deprivation under water
you pass out
A swimming pool filter can be dangerous because it operates under pressure and can explode.A fastener secures the top of the filter but in some cases the fastener can fail and allow the filter to top to blow off.
yes, it is dangerous because of the radiation that emits from the core at the bottom of the tank, however the radiation at the surface will only cause health issues later in life such as cancer and tumors, but swimming under the water in the tank deeper down near the core will expose your body to deadly doses of radiation the farther down you go.
Before or During puberty start swimming every day, their is less gravity under water which puts less strain on your growth :)
Well, this has happened to me before in the ocean and it is called a undertoe.. im sorry if t hat is not what you are looking for but that is what i know.
Yes.
by swimming
No, a swimming pool would be covered under Coverage B or "Other Structures" of your policy.
Yes, you can hear under water.
The answer is NO
SHAVE!
no
YES