A good mattress should ensure that no matter what kind of sleeping position a person is in, the spine can be kept straight and stretched, and the whole body can be fully relaxed when lying on it.
The mattress which is too soft will sag down when people lie down, which changes the normal radian of the spine of the human body, causes the spine to bend or twist, and makes the relevant muscles and ligaments to be tightened, long time can not get enough relaxation and rest, resulting in the feeling of backache and leg pain.
A person with a too hard mattress lying on it is only under pressure at the four points of head, back, hip and heel. Other parts of the body are not completely implemented, and the spine is in a state of stiffness and tension, can not achieve the effect of spinal rest and muscle relaxation, wake up still feel tired.
Sleeping on such a mattress for a long time will cause serious burden on muscles and spine and damage health.
When selecting a mattress with moderate hardness, the touch of the hand is not enough to identify the quality of the mattress, * the reliable method is to lie down and flip it left and right.
Good mattress, * * there is no uneven, sunken bedside or moving lining.
You can also test the bed surface with your knees, or sit down at the corner of the bed and try whether the mattress under pressure can be restored to its original state quickly. A mattress with good elasticity can be restored to its original state immediately after being pressed.
A good mattress can maintain the natural stretching degree of the spine, and fully fit the shoulders, waist and buttocks without leaving any gaps.
Lie flat on the mattress, extend your hands to the neck, waist and hip down to the three obvious bending places between the thighs to see if there is any gap;
Turn over to one side and try to see if there is any gap between the sunken part of the body curve and the mattress in the same way.
If the hand can be easily interspersed in the gap, it means that the bed is too hard.
If the palm clings to the gap, it is proved that the mattress fits well with the natural curves of neck, back, waist, hip and legs when people sleep, such a mattress can be said to be a mattress with moderate hardness, suitable for body rest and helpful for sleep.
