The cervical vertebra is located at the uppermost end of the human spine and is wrapped in the neck and consists of 7 vertebrae. The so-called physiological curvature is a smooth, forward-facing arc formed by the seven vertebrae, and the single-occipital pillow can just maintain this normal physiological curve.
The length of the pillow is 15 cm wider than the width of the shoulder. The height is equal to the height of the boxing (the height of the fist is higher than the height of the tiger's mouth). On the surface of the pillow, the part supporting the neck and the back (neck curvature) should be cylindrical and have a certain hardness, which can be set to support and support the neck curvature. The part supporting the back of the head should be 3-5 cm lower than the above part, so that it can support the head and adapt to the height of the neck.
Although the pillow is higher, it can make people feel emotionally stable and easy to fall asleep. However, if the pillow is used for a long time and the neck is fixed in the front flexion position, it will increase the symptoms of the elderly suffering from cervical spondylosis. The neck closure also forces the carotid artery to impede blood circulation. The pillow is too low, the blood flowing into the head is too much, the blood vessels are congested, and the neck muscles can not relax. After a night, the morning will feel head swelling, neck acid, and eyelid edema.
In addition, elderly people with cardiopulmonary disease can use two or three soft pillows to form a slope. After lying down, the upper body is slightly raised, so that the blood returning to the heart is reduced, which can reduce the burden on the heart and blood stasis in the lungs, and help sleep.
In the Tang Dynasty, the famous medical scientist Sun Sizhen said in the "Thousands of Gold" that "the winter is frozen, the spring and autumn are frozen, and the common law for the saints." It can be seen that the temperature of the pillow should be lower than the temperature of the head. Helps sleep. Modern medicine also believes that the temperature of the head should be lower to help to enter the dream. Wild chrysanthemum tastes bitter, spicy, slightly cold; into the lung and liver, is the first choice for pillow.