Are you accustomed to sedentary, hunched over and desperately working? Are you often back pain, neck and shoulder numbness, pain after work? Perhaps all this is because you do not pay attention to the health of the spine. Medical research shows that when the development of the intervertebral disc is completed, its degenerative changes begin. In the role of multiple factors, it will occur with age and irreversible “aging”, resulting in the original intervertebral disc to absorb the load, disperse stress function gradually declined. Due to modern lumbar muscle exercise less, poor sitting posture, prolonged use of computers, etc., so that the lumbar and cervical disc aging is particularly obvious, which can easily lead to reduced stability of the spine, small joint disorders and osteophytes, etc., and in serious cases, even the symptoms of compression of nerves and blood vessels. In many postures such as sitting, standing, walking and lying, it is widely believed that sitting is the most harmful to the spine, but which sitting posture is the most damaging? 1, leaning forward to sit: spine “pressure” for a long time sitting in a chair at work, sitting posture, I’m afraid, is the longest pose of the day. Sometimes people will choose the right posture at the beginning: sitting, only waist leaning on the back of the chair, but reading, writing, organizing materials, unconsciously on the body leaning forward and bending, such a posture seems to feel comfortable some, in fact, the pressure on the spine than the taut back sitting is also greater, the most powerful evidence is the data – taut Back sitting spine pressure is 110 (to natural standing spine burden index of 100 as a benchmark), while forward bending sitting is likely to reach 166. 2, taut back sitting: pressure is twice the weight of the study shows that in the chair without a backrest is sitting (upper body taut), the pressure on the lumbar spine is about twice the weight. That is to say, can sit in a chair with a backrest, never sit in a chair without a backrest. If sitting on a chair without a backrest, the body tilted forward about 20 °, because the abdominal muscles do not need to force, the back muscles must be like a tight bowstring, pulling the entire upper body, this posture on the “lumbar spine” pressure is three times the weight. Of course, the lumbar back muscle damage here, not because of the pressure, but because of a long period of continuous contraction. The same is sitting on a chair without backrest, if the sitting posture is completely relaxed, the pressure on the spine will be small, for 92. 3, the upper body bent forward to sit: the lumbar spine is very unfavorable whether there is no backrest, and whether the body is leaning forward, as long as there is support, the pressure on the spine will be reduced. For example, when sitting on the ground or on the bed, people are used to bending forward, this posture is very unfavorable to the lumbar spine, but if the two hands or elbows propped up on the thighs, it will reduce pressure, 86. 4, the whole body lazy sitting: spinal pressure by half in all sitting posture, there is a sitting method quite let the spine “open”, that is, lazy sitting, that is The body is trapped in the chair, the buttocks completely into position, the waist and back completely leaning, at this time the spinal pressure is 54. 5, driving forward to sit: the lumbar spine is unbearable load driving sitting is also the majority of the workplace population can not avoid sitting, so to speak, if the upper body completely back on the back of the chair, then it is basically the same posture as sitting in an office chair. If the upper body leans forward or back away from the backrest, such as arms on the steering wheel, it will produce a great load on the lumbar spine. 6, long-distance travel to sit: the spine is extremely vulnerable to injury when traveling by train, car and airplane, we have to sit for a long time, especially the continuous vibration of the transport will produce a continuous impact on the spine, thereby aggravating lumbago. Of course, the plane than the car, train vibration is smaller, but there may be other problems. For example, when flying at an altitude of 9,000 meters or more, the air pressure in the cabin is still maintained at 2,000 meters, which is lower than the air pressure at sea level, and the force of the nucleus pulposus protruding outward is greater than at ground level, so the fibrous ring has to bear greater tension. What is the best sitting posture for the body? The best sitting posture: lean back on the back of the chair tilted back 120 ° U.S., British and Canadian experts through their own research found that the backrest tilted back 135 ° sitting posture so that the lumbar spine to bear the least pressure. However, 135 ° sitting posture is easy to slide down from the chair, so experts recommend that the chair back angle adjusted to tilt back about 120 ° is better. If you can not complete this posture when using the computer, you can let the waist and back and hips completely against the backrest of the chair, in order to avoid leaning forward, try to put the chair close to the desk, or even inserted under the desk, the chair is too high when you can pad a footstool at the feet. The most taboo hip sitting in front of the chair about 1/2 place, that most tired waist. When sitting on the floor, the back of the waist cushion cushion leaning against the wall, you can also lean against the wall after sitting, curl up a leg. When driving, do not “cat waist” driving, but also avoid driving seat and steering wheel spacing is too large. The best position is to lean back completely on the back of the seat, the upper body slightly backward. During the trip, the body should move every hour for 10 minutes, if you can leave the seat and walk around a bit best; really can not, in the seat every once in a while to do some upper body bending forward or alternate hip lifting action, the spine is also beneficial, this method is also applicable to long-distance train or airplane people.