1, sleeping on a hard bed is to relieve back pain! When people get old, lumbar muscles and lumbar spine will continue to degenerate, become inflexible, and will often lumbago. Young people often bend over to play computer and other incorrect posture, but also lumbar muscle strain, lumbar disc protrusion resulting in lumbago. The normal physiological structure of the human spine has four physiological curves from the side view, namely cervical, thoracic, lumbar and sacral curves, cervical and lumbar vertebrae forward curvature, thoracic and sacral vertebrae backward curvature; any posture of the human body requires muscles, joints, ligaments at all times to maintain a certain tension to resist the influence of gravity. If you sleep too soft bed, the body will be deeply collapsed in the bed, sleep on your back will increase the physiological curvature of the lumbar spine, affecting the development of bones and muscles, ligaments around the spine and the joints between the vertebrae are overloaded, which can cause lumbar subsidence, lumbar muscle strain, disc protrusion, etc. Usually, when sleeping on a hard bed, the whole body weight will be shared by the head, neck, shoulders, back, waist, hips, arms, lower limbs and heels, etc. The burden on the lumbar spine is reduced, and lumbago will be reduced. 2, sleeping on a hard bed is not the same as sleeping on the floor and sleeping on a bare bed! Sleeping on the floor is the biggest bad is the night ground temperature is low, so that the waist blood flow slowed down, but aggravate the lumbar muscle strain. At the same time, when sleeping on a bare bed is empty under the lumbar vertebrae, there is nothing to support, the whole waist will be supported by the 2 most curved lumbar vertebrae. At the same time, the light board bed is too hard, the greater the pressure on the lumbar spine, but the waist can not relax when sleeping. In the long run, the waist instead of more pain. 3, hard board bed in the end is what bed? Hard board bed is relative to Simmons and other very soft bed, it refers to the mattress thickness of less than 10 cm bed. 4, in addition to the hard bed, sleeping position is also very important! In general, you can lay a 7 cm to 10 cm cushion on a thin and thick wooden board, the person lying on it should feel harder than Simmons, than the “light board” soft. The height of the pillow should preferably not exceed 7 cm. In this way, so that the patient in supine to a greater extent to comply with the physiological curvature, not to make some parts too much force, some parts of the suspension, side lying can also get the corresponding “lifting” force from the bed plate, so that people are more comfortable. Supine, in order to reduce the weight borne by the waist, can also be placed under the knee joint cushion, so that the joint parts moderate bending, so that you can share the weight of the waist weight-bearing at the same time, so that the lower limb muscles relax. When you get out of bed, it is best to wear a back brace again to avoid unnecessary sprains. 5, additional advice to programmers: should be consistent with the principles of human biomechanics of the table and chairs, if possible, you can choose a chair with armrests to support the elbow and relieve the pressure on the lumbar region. Seat height should be slightly less than the calf length, that is, when sitting double calf can be placed naturally on the ground, neither suspended nor overly flexed, the knee is naturally flexed about 90 °; sitting front and rear width should be basically the same as the popliteal fossa to lumbosacral length, so that it can well support the thighs and hips; cushion and backrest soft and hard to moderate, backrest angle is different, the pressure on the lumbar intervertebral disc is different, backrest angle to 90 ° The backrest angle reaches 90°, the waist without padding, at this time the pressure on the lumbar disc is the largest, but the backrest angle reaches 110°, while lining a cushion at the lumbar spine, the pressure on the lumbar disc can be reduced to a minimum.