Would it matter if you locked only one leg? I think it has something to do with your capillaries, but I could be wrong.
2006-08-11 15:00:29 · 12 answers · asked by Anonymous in Health ➔ Other - Health
Your heart can not pump blood all the way around your body. It needs help from your muscles. When your muscles flex, they push the blood farther along the veins. When you lock your muscles, you don't use them. That means that the blood that the heart is pumping into your feet is not getting back to the heart. Eventually, not enough blood flows through your brain (at any given time 50% of your blood volume is in your head) and you pass out.
2006-08-11 15:08:21 · answer #1 · answered by Anonymous · 0⤊ 0⤋
That is advice you give Grooms and people in weddings. DO NOT LOCK YOUR LEGS/KNEES OR YOU WILL PASS OUT.
Re: Why does standing with your 'knees locked' make you pass out?
Well the short answer is that it does not cause you to pass out.
By locking the knees, you diminish the use of the muscles in your legs which normally increases the blood return from the legs. As blood pools in the veins of your legs, your heart has less blood returning to be sent to the brain.
By unlocking your knees, you are forced to use the muscles in the legs more for the position of standing. There is no artery that gets blocked in the knees and causes the phenomenon.
Admin Note - It takes quite a long time of standing with the knees locked beforeone begins to feel light-headed and eventually pass out. This is affected by temperature, with fainting more likely on hot days. But in any event, the key is standing with knees locked for long periods, not simply locking your knees.
2006-08-11 15:05:05 · answer #2 · answered by jennifersuem 7 · 0⤊ 0⤋
when you lock both legs at the same time you cut off blood circulation. less oxygen gets to the brain. you pass out!
2006-08-11 15:07:33 · answer #3 · answered by justnotright 4 · 0⤊ 0⤋
If you pass out from locking your legs, you need a check up to see where the block is
2006-08-11 15:05:47 · answer #4 · answered by Anonymous · 0⤊ 1⤋
When you lock your knees it restricts blood flow so that you brain and the rest of your body doesnt get the oxygen it needs
2006-08-11 15:16:38 · answer #5 · answered by wuts wron with me? 1 · 0⤊ 0⤋
Sounds like you're pinching off some arteries. That can be dangerous. Don't do it. Worst case, you could cut off your circulation and actually die from it.
2006-08-11 15:06:53 · answer #6 · answered by Anonymous · 0⤊ 0⤋
when you cross your legs you are restrricing pressure on the blood veins meaning your blood presure rises
2006-08-11 15:03:52 · answer #7 · answered by Elaine F 5 · 1⤊ 0⤋
yea when u do that, circulation gets cut off, and thats why u pass out.
2006-08-11 15:03:00 · answer #8 · answered by rustik 4 · 1⤊ 0⤋
your blood stops going to your brain.
2006-08-11 15:10:52 · answer #9 · answered by Anonymous · 0⤊ 0⤋
I havent ever heard that in my life.
2006-08-11 15:03:12 · answer #10 · answered by perfect.warrior 2 · 0⤊ 1⤋