Computer World, Science Guide

How to choose a computer desk? Is it qualified if there is a desktop and legs?

What kind of problems do you understand if you have used a computer desk or chair that is not suitable for your body shape for a long time?

What is the healthiest ergonomic sitting posture? What kind of computer desks and chairs meet this standard?

  1. How does incorrect use of computer desks and chairs affect health?

Different postures, different postures, pressure and weight: sitting> standing> lying down.

When the human body is healthy, the pressure on the intervertebral disc is 100 psi, while the pressure on the sitting posture is 150 psi, and it is as high as 185 psi when hunched over. Most people's postures are not correct. Leaning on the table, hunched over, and legs crossed, almost all the weight of the upper body is concentrated on the 4th and 5th lumbar vertebrae, resulting in uneven pressure on the intervertebral disc.

May cause harm:

(1) The lumbar spine in some locations has slight lesions. Sore waist is the most common reaction.

(2) The hunchback and the reduction of the whole body affect the function of the respiratory and nutritional systems.

(3) Working at a low desk for a long time makes the cervical spine not stressed. If you look at the head and shoot, the body part is focused hard, which leads to animation and pain, and shoulder and neck problems.

If things go on like this, the body will not be able to return to its natural posture, and poor sitting posture will continue to affect the pain and affect the health as well as the body.

  1. The correct posture for using computer desks and chairs

If you search for a healthy office sitting posture, most articles or answers will tell you that the posture should be three 90°. With the development of scientific research, this answer is no longer the most scientific answer.

The judgment of a healthy sitting posture is shown in the figure:

(1) The healthiest sitting posture is that the knees and thighs are at an angle of about 135 degrees to the upper body, not 90 degrees

This is a joint study by Canadian and Scottish experts. Why is it 135 degrees? Because the large angle allows you to tilt your pelvis forward and maintain the natural curve of the lower back. This can reduce the pressure on the intervertebral disc, and the surrounding muscles and ligaments can be relatively more relaxed.

If you sit too low, your feet will easily be placed in front of you naturally, rather than on the sides, inadvertently creating a hunched posture, causing your back to bend abnormally.

(2) The ideal desktop height is just below your elbow and forms a 90-degree angle with your elbow. Your elbows should be relaxed on the elbow support pad. A table that is too high or too low can cause shoulder and neck problems.

(3) When looking up, the line of sight is the upper edge of the computer screen. No matter how large the screen is, it is the upper edge. The best condition is full head up without lowering the head. This will relieve the pressure on the cervical spine.

  1. How to choose a qualified computer desk

The design principle of the computer desk should conform to the principle of ergonomics. Simply put, the size of the computer desk should be in harmony with the height of the user, the height of the chair, and the body shape.

Dimensions, disassembled, are three elements: length, width, and height. For computer desks, the important levels of the three elements are:

High: Decide whether the user can have the correct sitting posture.

Length: Determine whether the arm can be stretched and ensure space for movement. Good planning of storage space brings better office experience

Wide: Decide whether there is enough space on the desktop for arm support, and work more effortlessly

(1) Height:

Most of the above are 70-75 cm tables, you can buy a lift chair to adjust to the height

(2) Length:

The length of the table top is 1 meter, 1.2 meters, 1.4 meters or 1.8 meters, depending on 2 points

①Your body shape, how wide the desktop can make you stretch freely

②Your plan for the desk space

The length of the desktop determines how large the screen, keyboard, mouse pad, etc. can be placed on your desktop. Take the monitor as an example. A small monitor occupies only half a meter in length. Some friends bought large monitors up to 1.2 in length because of professional or hobby needs. Meters, high requirements for space. It is recommended that you buy the right size according to your needs.

(3) Width:

Generally speaking, the width of the table top is more than 70cm so that it does not appear narrow. The forearm plus the palm, the distance to the keyboard, occupies about 45cm width. If you count the thickness of the monitor and the stand, it will take up an additional 25cm of space. Add up to 70cm.


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