Sitting up straight is not the best position for office workers, a study has suggested. Scottish and Canadian
researchers used a new form of magnetic resonance imaging (MRI) to show it places an unnecessary strain on your back.
They told the Radiological Society of North America that the best position in which to sit at your desk is leaning
slightly back, at about 135 degrees.
Experts said sitting was known to contribute to lower back pain. Data
from the British Chiropractic Association says 32% of the population
spends more than 10 hours a day seated.
Half do not leave their desks, even to have lunch. Two thirds of people
also sit down at home when they get home from work.
The research was carried out at Woodend Hospital in Aberdeen, Scotland.
Twenty two volunteers with healthy backs were scanned using a positional
MRI machine, which allows patients the freedom to move - so they can sit
or stand - during the test. Traditional scanners mean patients have to
lie flat, which may mask causes of pain that stem from different
movements or postures.
In this study, the patients assumed three different sitting positions
- a slouching position, in which the body is hunched forward as if they
were leaning over a desk or a video game console
- an upright 90-degree sitting position
- a "relaxed" position where they leaned back at 135 degrees while their
feet remained on the floor.
The researchers then took measurements of spinal angles and spinal disk
height and movement across the different positions.
Spinal disk movement occurs when weight-bearing strain is placed on the
spine, causing the disk to move out of place.
Disk movement was found to be most pronounced with a 90-degree upright
sitting posture. It was least pronounced with the 135-degree posture,
suggesting less strain is placed on the spinal disks and associated
muscles and tendons in a more relaxed sitting position.
The "slouch" position revealed a reduction in spinal disk height,
signifying a high rate of wear and tear on the lowest two spinal levels.
When they looked at all test results, the researchers said the
135-degree position was the best for backs, and say this is how people
Dr Waseem Bashir of the Department of Radiology and Diagnostic Imaging
at the University of Alberta Hospital, Canada, who led the study, 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."
Rishi Loatey of the British Chiropractic Association said: "One in three
people suffer from lower back pain and to sit for long periods of time
certainly contributes to this, as our bodies are not designed to be so
Levent Caglar from the charity BackCare, added: "In general, opening up
the angle between the trunk and the thighs in a seated posture is a good
idea and it will improve the shape of the spine, making it more like the
natural S-shape in a standing posture.
"As to what is the best angle between thigh and torso when seated,
reclining at 135 degrees can make sitting more difficult as there is a
tendency to slide off the seat: 120 degrees or less may be better."
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Source: BBC News