Don’t Sit Up Straight, It’s Bad For Your Back

November 29, 2006 – 3:37 pm | posted in Body Aches, Bones / Orthopaedics, Pain / Anesthetics, Public Health

It seems that sitting up straight, something many of us are taught from a very early age, is not good for your back, say researchers from Scotland and Canada. They found that sitting up straight strains your back unnecessarily. Ideally, you should lean slightly back, at an angle of about 135 degrees, they say.

The researchers, at Woodend Hospital, Aberdeen, Scotland, used a novel form of MRI (magnetic resonance imaging) on 22 healthy volunteers to identify which positions are best, and which are worst, for our backs. The Positional MRI Machine allows the patient to move around during the examination.

The volunteers were asked to sit in three different positions:

1. Slouching. The person hunches forward, with feet touching the floor.
2. Upright, at 90 degrees, with feet touching the floor.
3. Relaxed, reclined backwards at 135 degrees, with feet touching the floor.

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.

Study leader, Dr. Waseem Bashir, University of Alberta Hospital, Canada, said “Sitting in a sound anatomic position is essential, since the strain put on the spine and its associated ligaments over time can lead to pain, deformity and chronic illness.”

The study was presented at the Annual Meeting of the Radiological Society of North America (RSNA).

“The Way You Sit Will Never Be the Same! Alterations of Lumbosacral Curvature and Intervertebral Disc Morphology in Normal Subjects in Variable Sitting Positions Using Whole-body Positional MRI
Waseem Bashir MBChB, Tetsuya Torio MD, Francis Smith MD, Keisuke Takahashi, Malcolm Pope PhD
Click here to view abstract online

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