how lifting ojects can cause back pain?

We lift object with hand, so how it effect our back?

It's your fault, for walking around on two legs instead of four.

 

Your backbone was designed to be a horizontal bridge connecting the limbs of a quadruped, not a vertical column to support an upright torso. Also, remember that you're putting more weight on your spine when you pick something up.

 

The hand is more for grasping, the arms do part of the lifting, and your back and leg muscles are usually involved as well, depending on how heavy the object is. Humans are balancing their torsos and their big-brained heads over their hips when they walk or pick something up, plus we're also twisting and torquing our backbones in ways other mammals don't. Since the back has the poorest design for that type of work, it's your back that suffers.

It's your fault, for walking around on two legs instead of four.

 

And for bending your back when lifting. This sot of injury is largely avoidable.

We were born with the instinct to lift correctly... but then... we unlearn it as we grow older!

 

plus we're also twisting and torquing our backbones in ways other mammals don't.

I dont understand twisting and torquing our backbones is really hard, backbones dont move it always stationary, why you mention twisting and torquing?

I dont understand twisting and torquing our backbones is really hard, backbones dont move it always stationary, why you mention twisting and torquing?

 

Really? You can't stand with your hips stationary and turn your shoulders? You can only bend rigidly at the waist?

 

I don't think so.

I dont understand twisting and torquing our backbones is really hard, backbones dont move it always stationary, why you mention twisting and torquing?

 

Imagine a skeleton playing tennis. Or moving boxes onto a truck. As we set our feet for balance, we can still twist at the hips and shoulders, as well as bend our legs at the knees and ankles. And our backbones aren't rigid like a stick, if that's what you mean by stationary. All the vertebrae act as a flexible bridge to aid in movement and support for a creature with four limbs. Our hands and upper bodies have evolved to suit our bigger heads and the broader variety of things we now use our hands for, but the spine is such a major piece of skeletal framework that it would be really expensive (in an evolutionary sense), to change it just because we're now walking upright.