Disk Biochemistry.

Proper joint motion helps remove wastes and fluids from the disks of your spine and improves the flow of proper nutrients into the disk. It is important to understand that the disk does not have a direct blood supply, and disks only stay healthy with motion. With lack of motion there is decreased oxygen, glucose, sulfates, and proteoglycan content, all of which are essential for disk health.

Journal of Manipulative and Physiological Therapeutics, 1992