There are many kinds of schoolbags for primary and middle school students, such as double shoulder bags, drawbars, schoolbags and so on. Although rod schoolbags can relieve the pressure on children's shoulders, some schools forbid children to use rod schoolbags for safety reasons. So far, what we call student bag usually refers to the form of shoulder bag. But whether children can carry schoolbags correctly and protect their shoulders and bones is something that many people will overlook. So let's go into the details of the right way for children to carry backpacks, which, of course, is equally effective for adults.
Usually, we see children carry their backpacks this way, and over time, we mistake it for nothing. But this is the worst knapsack way we have to say.
Reason
1, the principle of mechanics.
First of all, from a mechanical point of view, the shoulder blade is the best point of force on the back, which is why many children carry heavy schoolbags, the body will bend forward, because this can transfer weight to the shoulder blades above. However, unreasonable backpack size and unreasonable way of carrying, will make the backpack center of gravity to the body of the gap increased, thus the body's entire center of gravity backwards, resulting in instability of the body movement, more likely to cause falls or collisions.
2, the shoulder strap is loose.
Secondly, the shoulder strap of the backpack is loose, causing the backpack to move downward as a whole, and part of the weight of the backpack is distributed directly to the lumbar spine, and importantly, the force is from the back forward. Because of the position of the spine and its natural bending direction, we know that pressing the lumbar spine backwards and forwards is more likely to cause spinal injury.
3, two shoulder straps are not the same length.
Thirdly, because the shoulder strap of the backpack is loose, the children do not pay much attention to the length and length of the two shoulder straps, and the length and length of the shoulder straps is easy to cause the child's habit of shoulder sloping. Over time, the influence on children's physique will be irreversible.
countermeasure
1, choose the right size schoolbag.
The shoulder bag (especially for primary school pupils) of primary and middle school students should be chosen as appropriate as possible. Proper size means that the bottom of the backpack is not lower than the child's waist, which can directly avoid the child's waist force. Parents will say that children have a lot of homework, so they need a lot of backpacks. In this regard, we suggest that children should be educated to form good work habits, schoolbags can only be filled with necessary books and enough, minimal stationery, do not let children take the backpack as a cabinet, everything is put in.
2, there are pressure relief materials on the shoulder strap.
Selection of shoulder straps with decompression cushioning function of the bag, decompression cushion is made of elastic material, so can be adjusted slightly shoulder straps are not the same length. At present, there are only two kinds of cushioning materials on the market, one is sponge, but the thickness of the sponge used by different brands is different; the other is memory cotton, the same material as memory pillow. According to the relevant tests, the decompression effect of the two materials is usually about 5% ~ 15% because of the different thickness of the material.
3, tighten the shoulder strap and try to move up.
When a child carries a backpack, he must tighten his shoulder straps and try his best to keep the backpack close to the child's body, instead of slacking it on his back. It looks relaxed, but the damage is the greatest. We can see from the soldiers' knapsack that the way of soldiers' knapsack is worth learning.
