Rule of comfort

Busy outside, you have to enjoy it when you return home. Every joint of your body needs to find a place to stretch easily. Sitting on a soft and comfortable sofa is the most suitable. The size of each part of the sofa should meet the requirements of ergonomics, and the surface suitable for the physiological structure of the human body is better. If the living room is small, a sofa bed with a sitting function is a good choice. The height of the sofa seat should be equal to the height of the person's calf plus the heel of the shoe or a slightly lower height, which is between 35 and 42 cm. If the seat is too high, the feet will be suspended, the weight of the human body will be pressed on the legs, the back muscles will be tense, and the muscles in the legs and back will feel sore for a long time; if it is too low, the back muscles will not be Being able to be in a natural state, the stress on the thigh will be reduced, and for a long time, you will feel muscle soreness. The width of the front of the single-seat sofa seat should not be less than 48 cm; the double sofa should be above 95 cm; the three-seat sofa should be between 140-145 cm, and the depth of the seat should be between 48-55 cm. When the body is sitting on the sofa to the maximum, it is better to keep the knee joint outside the sofa. If the sofa is too deep, the back cannot be completely attached to the back of the sofa when sitting down, so that the waist lacks effective support, and the waist muscles are always in a state of tension and contraction to maintain the sitting posture. If the time is long, the lumbar muscles will be strained. The height of the backrest is preferably between the shoulder and the ear when sitting down, and is about 68-72 cm from the ground to the top of the backrest. Many people now like to use high-back sofas, which is not scientific. Because the person's shoulder rests on the high back, the waist, back and back should be separated by a certain distance, and the body and the sofa contact surface are less, so that if you can't sit for a long time, you will feel fatigue due to nowhere to rely on the waist and back. In this respect, the low-back sofa has obvious superiority. This is because people sit on the sofa, and the back of the body is almost entirely dependent on it. The contact area is large, the body feels comfortable, and the sitting posture is beautiful and graceful. The inclination of the backrest is preferably between 100 and 108 degrees. The height of the armrests on both sides is between 62 and 65 cm.