Sleeping with Back Pain

The value of the load, which compresses two vertebrae, is determined to a large extent by the position of the body. It is the lowest when the body is in a horizontal position. In the standing position the pressure between the vertebrae increases. When a person stands, the load at the bottom of the lumbar spine is 4 times greater than when he lies. The total value of the load in this case is equal to the total weight of the upper body.

The allocation of the person’s pressure inside the disk that performs the work in a sitting position or while bending the trunk a little, shows that the rear disk parts are somewhat more unloaded than the front ones.

This means that the pressure inside of the disk is directed toward the spinal canal and has a predominant effect on the rear arc of annulus fibrosus and posterior longitudinal ligament. Obviously, the degenerative and dystrophic process develops in this part first and the possibility of the hernia formation toward the spinal canal is the greatest here. This feature of the allocation of the loads on the widths of the disk makes us understand the reason for the high frequency of degenerative disc disease and its complications in persons of sedentary occupations in comparison with those who perform the dynamic work. In dynamic work all the parts of the disk are loaded more or less uniformly, and thus the probability of a local dystrophic lesion disk decreases.

When a person bends forward from a standing position, the total load increases to a great extent. This is due to the effect of the lever formed between the part of the body, which leans forward, and the vertebrae. Such an effect leads to the fact that the pressure between the two vertebrae in the lower part of the lumbar spine when it is bended is 2,5 times more in comparison with the situation when stands upright, and 10 times more than when simply lies.

The same strong pressure between the two vertebrae occurs when a person sits, leaning forward, not leaning on hands. If lean on the hands, putting them on a table or chair, the load on the upper body is reduced, thereby decreasing the pressure on the vertebrae.

The pressure between the two vertebrae increases when a person lifts an object, leaning forward with straight legs. In this case, the load on the intervertebral disc makes few hundred kilograms.

When spinal traction occurs, for example, when a man is hanging by his hands, without standing on the legs, the pressure is lower than in the prone position. At the same time the stretching in the intervertebral disk may even happen. This fact is sometimes used in treating of certain diseases of the spine.

The weight of the head puts pressure at the cervical vertebrae. Even the hands make load on the cervical spine, because the shoulder girdle muscles, which raise the hands up, are constipated to the back part of the head and neck. When raising the hands up, those muscles tense up, and thereby vitiate the vertebrae. Many knowledge workers unconsciously raise the shoulders. This leads to additional load on these vertebrae. There are great loads on the cervical vertebrae when working with hands rose up (for example, washing windows), particularly when there are heavy objects in the hands.

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