Astronauts will be overweight and weightless during high-speed take-off and return descent when launching in the cockpit of spacecraft. Generally speaking, the strength of your body is applied to you in several times, generally reaching 6-10 g.

According to the scar theory, the strength of the scar on the skin will be greatly reduced, and it is easy to tear if the scar is deep, because even if the scar heals, its strength and toughness are still poor. In this way, when the acceleration exceeds 3 g, if the skin strength at the scar is not enough, it may lead to rupture, which may lead to a series of problems.