In modern society, most people spend most of their waking hours in a "sitting" position. Half of the eight-hour work day is spent sitting in the same chair and maintaining the same posture, and the long-term sitting position eventually accelerates the degeneration of the intervertebral disc.
People often think that the easiest and least labor-saving thing is to sit. actually not. When a person sits in a chair, the weight of the body is not all on the entire buttocks, but in a small area between the two sit bones. Studies have shown that sitting compared to standing, the lumbar spine bears 40% more pressure; if the body is leaning forward, the lumbar spine bears 75% more pressure, even 2.5 times more.
In addition, the intervertebral disc used to buffer the pressure is located between the vertebrae and the vertebrae. Due to the long-term maintenance of a static sitting position, no blood vessels flow into the intervertebral disc. Therefore, sitting in a static posture for a long time will reduce the blood flowing into the intervertebral disc, accumulate waste produced during metabolism, and also accelerate the degeneration of the intervertebral disc. Over a long period of time, the degenerated intervertebral disc will become flat, deformed or ruptured. Since the spine is covered with fragile and vulnerable spinal nerves, when the degenerated intervertebral disc irritates the spine, some symptoms of the musculoskeletal system of the body may appear . For example: pain, numbness, weakness, etc. The most common sites of symptoms include the waist, lower extremities, shoulders, neck and arms.
When sitting, the body weight of the upper body is transmitted through the spine to the sitting bones that contact the seat surface. There are intervertebral discs between the vertebrae to buffer these pressures and provide spinal mobility. Therefore, a good sitting posture can reduce the pressure on the intervertebral disc, slow down the rate of intervertebral disc wear, and reduce the discomfort in the waist caused by sedentary sitting. But choosing a good chair that fits can complement each other.
The principle of ergonomic chair:
To put it simply, the principle of an ergonomic chair is to design it into two sections, the front and back, so that the angle between the upper body and the thigh is maintained at a downward angle of 105-110 degrees without sliding down, and the curvature of the lumbar pillow supports the curvature of the lumbar spine, thereby improving Upper body mobility and comfort.
At the same time, adopt a high sitting posture and inductive backrest, use the horizontal chair surface to support the weight of the upper body, and the forward-tilted chair surface is used to maintain the downward tilt angle of the thighs, so as to reduce the possibility of pelvic rotation curvature and straight spine deformation And use the lumbar backrest to continuously maintain the front curvature of the lumbar spine, while the chest backrest is used as a support for the upper body when the upper body is intermittently tilted back during work.
Therefore, in terms of ergonomics, a good ergonomic chair can greatly reduce the pressure on the muscles of the lower limbs, prevent unnatural body postures, effectively reduce the burden on the blood system and promote its circulation, and ensure the health of the spine. .
How to choose the ergonomic chair that suits you:
There are two types of ergonomic chairs available in the market, one is imported and the other is domestic. Imported ergonomic chairs, such as Japan, the United States, and Germany, have a minimum unit price of 30,000 yuan and a maximum of more than 100,000 yuan; while the price of domestic brands ranges from hundreds to tens of thousands. However, because everyone's body shape is different, some people think that domestic ergonomic chairs are more comfortable; others think that imported ergonomic chairs are better. Therefore, there is no one ergonomic chair in the world that is suitable for everyone. Therefore, when choosing an ergonomic chair, we must pay attention to the following points:
[Seat height] After the seat height of a suitable ergonomic chair is adjusted, the user's feet can be relaxed and flat on the ground when sitting down. Once your feet are relaxed and flat on the ground or on a footrest, you will find that when you put your feet flat your knees and hips are at the same height and there is less pressure on your thighs . Therefore, an ergonomic chair that suits you can maintain the angle between your thigh and calf at 105-110 degrees after adjusting the height to reduce the pressure on your lower limbs.
[Adjustable lumbar support] The lumbar spine of a normal person will have a natural lordotic curvature when sitting. When you sit on an ordinary chair and reach out to touch the waist, you will feel an empty place. It is impossible to fully access the back of the chair. In this way, when sitting for a long time, the muscles of the waist must continue to exert force. Therefore, a suitable ergonomic chair must have proper lumbar support at the fourth and fifth lumbar vertebrae, and the thickness of the lumbar support is preferably about 5 cm, and the height is about 10-18 cm. But if the support point is too low, the spine may cause pain and discomfort due to the constant arching of the spine. Therefore, the lumbar support of the seat should preferably have a spring action and be adjustable in height, which can move in and out with the back of the human body.
[Upper back support] When sitting down, the thoracic spine is different from the lumbar spine, which presents a kyphotic curvature. Therefore, unlike the design of lumbar lordosis support, the support of the thoracic spine on the upper back must have a kyphotic curvature. . Counting from the chair cushion, the height of the upper back support must be 50 cm high.
【Seat Cushion】A good seat can adapt to changing postures. A seat cushion with a large surface area is desirable because it increases the contact surface, thereby reducing uneven pressure distribution while sitting. In addition, the seat cushion made of fiber material can not only breathe, but also reduce the body from sliding down. Never choose a seat cushion with a plastic surface, because the plastic surface is not breathable and the surface is too slippery, making people uncomfortable to wear. Secondly, if you choose a seat cushion that can be adjusted front and rear, it will be easier to adapt to different sitting postures and reduce the stress on the lower limbs, making work more comfortable.
[Chair handle] Chairs with handles can help support the weight of the upper limbs and reduce the burden on the intervertebral disc. The proper height of the handle is better to allow the shoulders to hang down relaxedly when the forearm is placed flat, and it is better to have an adjustable handle to meet the needs of users in different sitting postures. For example, when using a computer, the arm of the chair can make your elbow and the desktop form a 90-degree angle to reduce the burden on your shoulders.
Presentation by IFCO:
There are various types of ergonomic chairs on the market, and the quality varies. In view of this, we sincerely recommend a high-quality ergonomic chair made of aluminum alloy---Ergohuman Plus (Luxury). It is manufactured by the well-known Taiwanese manufacturer Comfort-Seating, and has sold 48,000 copies worldwide.
Ergohuman Plus (Luxury) uses American Matrex mesh fabric, which is tough and durable, with high air permeability and a maximum load capacity of 150 kg. In addition, its ergonomic concept uses the world's first single-lever control chassis, which controls all functions, including the forward and backward movement of the seat cushion, the elevation of the seat height and the inclination angle of the backrest. Ergohuman Plus (Luxury) is also equipped with humanized designs such as a fully automatic elastic lumbar support system, 4D hand pillow, foot pillow, multi-angle adjustable headrest and chair back height, so that users can enjoy the Get all-round protection and support for the upper spine, front spine, elbows, and lower limbs.
Since Ergohuman Plus (Luxury) has been exported abroad for a long time, the quality must be guaranteed. Therefore, this product has not only obtained the US BI FMA office furniture certification, but also passed the GREENGURD international certification and various additional approvals for environmental protection and fire protection, which is unmatched by other ergonomic chairs.
- See more at: https://www.ifco.com.hk/index.php?route=information/information&information_id=4#sthash.kdZDxzG6.dpuf