In this position the pressure on the spine is greatest, say scientists.
Prolonged sitting upright is most inappropriate for the body because it can quickly provoke pain, Canadian researchers reported.
They have observed healthy people sitting in different poses - lean forward with your back straight, gently sloping back and resting on the back of the chair back and found that the most dangerous back is bent forward posture with the body in which the backbone faces.
"The less stress on the spine does position in a reclining position with a deviation of the body back to 135 degrees. This situation is closest to utterly relaxed state when he lies, "advised Canadian scientists quoted by the BBC.
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