Sami Margo, a spokesperson for the International Association of Physical Therapy Chartered, said that the human spine is not suitable for sedentary. The sitting posture changes the natural shape of the human spine, making the muscles and bones more and more uncomfortable. The healthy person's spine has a natural S shape, but the sitting posture pushes the waist back into a C shape, which makes the back and abdominal muscles that support the body lose their function. Over time, the back muscles become weak and unable to support the spine. The movements of the limbs are no longer free, stretched, and the pain and injuries are more frequent than before. Therefore, in addition to choosing the right sofa, mattress and other daily furniture, our daily work can not completely sever the relationship with the chair. How to adjust the sitting position, it is especially important to choose a chair that fits health. Whether the seat is comfortable or not is related to the size of the human body. The crowd is different from the crowd. In general, the northerners are tall, the southerners are slightly shorter, and the same is true in North America and Europe. There are differences between men and women, and individuals and individuals are also different. Therefore, it is uncomfortable to take a try. I mainly know the following points: Standard for healthy chairs Standard 1 seat height is not less than 39cm The seat height should be equal to the length of the calf. After sitting down, the calf will naturally sag and the sole of the foot will land. Too high, the calf is hanging, the pressure on the lower leg is too long for too long; the seat is too low, the thigh is not placed on the seat, the weight of the human body is concentrated on the buttocks, and it will be uncomfortable for a long time. The good seat design should make the center of gravity of the user's upper body fall on the bones of the buttocks, and set the height of the seat according to the reference position of the person's seat (the ischial node). Generally, the height of the seat is 39cm. Between ~42cm, if the height of the seat is lower than 39cm, the user's knee will be arched, resulting in discomfort; when the height of the seat is more than 50cm, the body pressure will be dispersed after the user sits down. To the thigh part, the inside of the user's thigh is compressed, which can cause swelling of the lower leg. In a seat-based chair, the depth of the seat should be equal to the length of the thigh. After sitting down, the bend of the knee joint is just to the side of the chair. The seat is too deep and the back is not covered. The seat is too shallow and the thigh does not have enough support. Not comfortable. Standard 2 seat can not be too narrow When we want to choose a chair that is suitable for ourselves, we should consider the seat, backrest, and armrests of the chair. The width, depth, inclination, and back bend of the seat surface must conform to the scale of the body and the law of movement of each part. A good chair, the width of the seat must also be just right, the seat surface is too narrow, it will make the user feel uncomfortable, because the muscles on both sides of the body will be squeezed; if the seat is too wide, use The double hips of the person will definitely open outwards, so that the tendon tissue such as the latissimus dorsi and the deltoid muscle of the user will be pulled. If you sit for a long time, the user will feel tired. Related reading: chair size and design basis Standard 3 backrest tilt 110 degrees The backrest of a good chair is also very particular. Generally speaking, for a chair, the backrest is not a necessary part. If the user has a large range of activities and wants to be able to flexibly turn and pick up the items, he or she can choose a chair without a backrest. The back of the chair preferably supports all or part of the waist, back and neck. The longer you sit, the better your support will be. The dining chair can be ignored because it is only used during meals, and the office chair is best taken care of. Imported furniture sizes are often more suitable for people in the country of production, and special attention is required when selecting. When the user works for a long time, the chair with the backrest can make the user feel more comfortable. Generally speaking, the height of the backrest is not fixed, depending on the habits and feelings of the user. For the work chair, as long as the movement of the user is not affected, the lower back height can only reach the first second lumbar vertebra of the user. The upper one can reach the shoulder blade and neck of the user; however, for a casual chair, the height of the backrest is preferably to the neck, so that the user's head is supported to facilitate the rest of the user. Standard 4 chair is too soft and hurts people The softness and hardness of the chair is also very important. The anatomy and physiology of the human body tells us that when sitting, the lumbar load of the person is larger than when standing, the position of the spine and the pelvis should be vertical, and the vertical fixed position is the muscles on both sides of the spine. Maintain. If the position of the spine and the pelvis is shifted for a long period of time, the force of the system will be biased, which will easily cause back muscle spasm and even bone damage. Over time, the user will feel back pain. A chair that is too soft is easy for the user to bend up, and the muscles and bones of the whole body are unevenly stressed, which leads to back pain. In this case, the user should consider changing the chair and choosing a harder chair for himself. If you continue to use the original chair, move your hips back as far as possible while sitting down, so that the back is close to the back of the chair instead of Hanging, you can also consider adding a cushion to your waist as a support. Both the seat and back material should be of the "outer soft inner" type - the bracket should be strong enough, but the surface has an elastic layer of a certain thickness. The outermost material that comes into contact with the human body should be breathable, wear-resistant, and dirt-resistant, and it is not easy to generate static electricity from the human body or clothing. Office Supplies Wholesale, Office Supplies Set, Office Stationers JNY International Trade Co., Ltd , https://www.jny-stationery.com
April 09, 2021