Tuesday, November 28, 2006

Sitting up straight could cause back problems

Sitting up straight might not be the best choice ...

"It seems that "sit up straight" is a parental command that just lost its thunder.

It turns out sitting up stick-straight is bad for the back, researchers say.

Your back is best off in a reclining position, which takes pressure off the spinal disks in the lower back, compared to the upright posture that most people consider normal, according to new research presented today at the annual meeting of the Radiological Society of North America.

"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," said Waseem Bashir, the study's author, in a news release.

Though reclining might relieve strain, it won't necessarily alleviate back pain.

Lay Back, Relax Your Back

Researchers used a positional MRI scanner to collect images from 22 volunteers with no history of back pain.

A positional MRI, as opposed to the better-known tunnel MRI, allows patients to move around during imaging and allows scientists to see how different body positions affect the back and spine.

Using the MRI images, scientists determined which sitting position with feet still on the floor -- put the least stress on the back by measuring changes in the height between vertebral discs and other changes in the way the spinal column was curved.

Images of volunteers sitting upright at 90 degrees showed more signs of strain on the spine than images of those who were reclining at 135 degrees.

This reclining position also put less strain on the spinal disks and associated muscles and tendons compared to slouching forward, the study authors say.

Researchers conclude the reclining posture is the best and recommend that patients invest in some home or office furniture that is ergonomically designed to let someone sit in this "optimal position."

Could the Right Chair Halt the "Inevitable" Decline?" (Continued via ABC7 Chicago) [Ergonomics Resources]

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