what does this mean "don't lock your knees" I'm not a native English speaking person ....?

Question

i've been living here for the pass 4 years..and i really dont understand what does that means...i joined the army and what they keep telling me is dont lock your knees and dont look down otherwise u might pass out????

Answer 1

That's the advice given to troops standing in formation for long periods in the heat, and for good reason.

If you're standing with your legs fully extended, your knee joint is slightly over-centered, in other words locked. If you lose consciousness the joint still stays that way and your body falls like an upright board that is tipped over. Your head will be moving at a pretty good clip when it hits the ground and you can actually be injured fairly badly.

If you keep your knees slightly bent you tend to fall straight down in a heap and don't pick up as much speed.

Locking your knees does not block blood flow or make you more likely to faint. It just makes it worse when you do.

Answer 2

Locking Knees Passing Out

Answer 3

Locked Knees Fainting

Answer 4

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Answer 5

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RE:
what does this mean "don't lock your knees" I'm not a native English speaking person ....?
i've been living here for the pass 4 years..and i really dont understand what does that means...i joined the army and what they keep telling me is dont lock your knees and dont look down otherwise u might pass out????

Answer 6

When you stand at attention they tell you not to lock your knees (as in don't stand with your leg fully extended and your knees "locked") because you can black out.

Answer 7

When standing in formation if your legs are utterly straight(locked knees) after a certain amount of time they won't bend any more and you will fall down(very embarassing).

It can mean don't be set on a path and inflexible in your outlook too.

The advice you were given is accurate.

ret. USAF SNCO, Former MTI(Drill Instructor)

Answer 8

It mean not to put your legs strait. To keep at least one knee so slightly bent so blood will still flow. If you lock your knees, the blood doesn't flow through properly and you loose feelings in your legs and you fall down.

Sit on the floor with your legs out in front of you. Reach for your toes. That's what locking your knees feels like.

Answer 9

It literally means don't lock your knees. Don't stand with your legs absolutely locked straight. It interferes with the blood flow in your body, and can cause you to pass out.

Answer 10

It does has to do with blood flow. Blood pressure is more in arteries than veins. Veins have to usually bring the blood back to the heart against the gravity when standing, unlike arteries, and that is helped by the contraction of muscle tissues all over the body. If your body is moving, contraction in muscles happen and that pushes your blood in veins towards heart. If the knees are locked and there is no movement, there are no contractions and thus the amount of the blood reaching heart decreases, which also decreases blood supply to brain. This leads to fainting and person falling on the ground. Now when the person is in fallen state, lying horizontally, it is easy to body to get back to normal, as the veins don't have to struggle to push the blood towards the heart against the gravity.