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this is why you get light headed when you are sitting and stand all of a sudden because when you are sitting your blood tends to pool up in your legs and standing all of a sudden sends a sudden huge burst of a lot of blood to your brain. your brain gets a little oxygen starved when you are sitting. Source(s):
Standing desk aficionados tend to experience more pain in the lower back, legs and feet. If your body is using the same muscles, the same way all the time, you're going to experience strain, said Freedman. When you're standing in one place, the muscles are still working to keep you erect. Your back muscles, the muscles in your core, are still working to keep you up straight.. This is why some experts advocate you take breaks from standing. Dr. Rob DeStefano, a chiropractor in private practice in New York City, recommends alternating back and forth between sitting and standing.