Humans with an infinite lifespan can improve their muscle strength if they continue to exercise?
Can you have superhuman strength?
Of course not.
It's like you can never build an aircraft carrier with paper. The material properties of human beings are limited to death.
No matter how you exercise, the materials that make up your tissues, skin, muscles, organs, and bones themselves don't change. For example, the skull is only about the same strength as a coconut.
The mechanical properties of coconut shells are as follows[1]:
According to the different warp and weft directions, the strength limit of coconut is about 22.6~59.5MPa (about equivalent to some wood).
Compressive ultimate strength of human bones with different humidity [2]:
It can be seen that according to different bones, as well as dry humidity, the strength of human bones is between 40~76MPa, which is only a little stronger than coconut shells, and the strength range overlaps.
With such extreme intensity, no matter how you exercise, a wolf hammers down, and the person is directly gone.
Although human bones are made up of hydroxyapatite, which usually makes up only two-thirds of the bone, the rest is made up of collagen fibers, which have a much lower elastic modulus.
Adult bones are generally slightly harder than wood, about the same as brick and sandstone, 1/4 of lead and 1/10 of steel [3].
The strongest femur and tibia in the human body have a strength limit of about 120MPa.
Even if we don't consider the strength of the bones, soft tissues and tendons at all, just from the strength of the tibia, we can calculate the limit height that can bounce.
The minimum cross-sectional area of the human tibia is usually 3.2 cm^2.
Let's say you weigh 60kg lighter, have excellent tumbling skills, and have a limit distance of 0 .8m for landing cushioning.
According to the formula: , get:.
In other words, no matter how scientifically you exercise, jumping from a height of 4 meters and landing on solid ground that does not provide additional cushioning will also break a bone.
Perhaps, you can replace the bones directly through futuristic technology.
For example, using ultra-high-strength carbon fiber as a bone, its strength can be close to 10GPa, although it is not superhuman, but the bone can support you to jump freely from a height of 40km.
When the human body falls, the ultimate speed in the air is tens of meters per second (the specific limit speed is related to the way of falling), and the ultra-high-strength carbon fiber can support the speed impact, which is about 2 times the limit speed of the human fall.
However, if you only improve the strength of the bones, the moment you hit the ground, the other tissues of the whole person will fall apart directly.
The typical strength of human skin is far inferior to that of wood.
The skin has to be made into nanomaterials with future technology, isn't it, and the strength of a few GPa or more is about the same.
The strength of human tendons is still good, reaching a strength of 600-1300MPa, but the tendons are too thin, and the impact is much higher than that of bones.
Someone must have thought of replacing tendons with spider silk, but the properties of spider silk are a bit of a toss-up.
The strength of spider silk is about 10 times stronger than that of human tendons, which doesn't look good. However, spider silk has a property, that is, the higher the strain, the greater the strength.
The data in the red box is the strength limit of the spider silk when the strain rate changes, and when the spider silk is stretched by 2.4% per second, the strength can easily reach above.
As long as it is not stationary and keeps moving, the strength of the spider silk is quite MAX if it is made into tendons.
I'm sure if you swap your muscles and tendons for spider silk, you'll be able to experience what is real: ridiculously long, you can't stop.
Of course, muscles need to be remodeled as well. After all, the human muscle fiber has about 0.3μN tensile force per root, and the strength is increased by increasing the dimension of the muscle. However, if you increase the muscle dimension, you will also gain weight, and the overall ability to resist free fall will decrease.
If you want to be static and not break the tendon, I recommend you go straight to the carbon nanotubes. The intensity is more than enough.
But after transforming the muscles, tendons, and bones, can you fly freely in the Oriental Pearl Tower?
No, after all, internal organs, brains are still ordinary materials. Where can it withstand the toss.
So, after changing your brain, are you still you?
Therefore, my suggestion is: since it has an infinite lifespan, when the technology reaches a certain point in the future, wouldn't it be nice to fly directly to the machine?