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False.

The intradiscal pressure of the L4-5 intervertebral disc while lying supine (face up) is 0.1MPa, while sitting relaxed in chair is 0.46. That's only 4.6x greater. This is from the latest research done in 1999.

Earlier research from the 1960's showed higher intradiscal pressures while sitting, but this was done with less sophisticated technology and still wasn't 11 times higher.

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Q: Intradiscal pressure is eleven times greater when seated versus lying down?
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