The importance of reinforcing good posture by many practitioners is killing me. So I'm here to give you the break down of this incredible overused sentence " you have bad posture' >:(.
Many hours spent at a desk by many forces us to do a few things.
2. become erect
3. relax into the chair
So whats best?
Well extended strain in static posture is not advised it poses great load and pressure on the spine and muscles in the legs as well. >:) why the evil grin you may ask yourself.. This is actually my meat and potatoes for my line of work. It keeps me busy. Years on people's body, straining in one position at a desk complaining of low back pain and upper body neck tension. We were meant to move. Actually it is the fountain of youth.
Lets explore a bit further.
Excessive bending and twisting at a work station puts the spin in a non neutral position and can damage the spinal discs, increase the demands on the muscles and ligaments.
People at a workstation may also be forced to assume non-neutral arm, shoulder, and neck and wrist posture. >:0 (good for my business and my colleagues).
Lets look at localized contact stress on the hamstrings and gluteals. Basically the weight of yourself on your leg muscles will impede circulation and contraction. It will be harder to use because of this stress. DVT (deep vein thrombosis) and risks associated with DVT increase as well. Think embolism!
So prolonged sitting can cause herniated discs, premature deterioration of discs and overall spinal degeneration. The resulting chronic back pain and possible nerve damage as well as neck pain and TOS (thoracic outlet syndrome).
So whats best??
Measurements of spinal angles, spinal disk height, and movements were taken. When undue strain is placed on a disk, it moves - often out of place. The researchers found that the upright position, at 90 degrees, caused disks to move the most, while the relaxed position (135 degrees) caused disks to move the least. In other words, the upright position is the worst for the back, while the relaxed position is the best.