Why Does an Achilles Tendon Tear? / Mr. Denjiro's Happy Energy! скачать в хорошем качестве

Why Does an Achilles Tendon Tear? / Mr. Denjiro's Happy Energy!

DENJIRO: You need strong muscles and sturdy bones to lift heavy objects. They are connected by something known as "tendons." Do you know what the thickest tendon in your body is? It connects your calf muscles to your heel bone: the Achilles tendon. The name comes from the powerful warrior in Greek mythology known as "Achilles," whose only weakness was his heel. It's a very important part of your body. Let's take a look at an actual Achilles tendon. This comes from a cow. Let me cut it. You can see that it's tightly bound together with vertically running fibers. This is the dried Achilles tendon of a cow. Back in the day, this was pulled apart into finer strands then twisted together to make bowstrings. Let's see how strong an Achilles tendon is. This is a dried cow tendon that's been shaved down. Let me hang from this. It's not tearing at all! But sometimes, this durable tendon can get torn. The Achilles tendon doesn't stretch; it's actually the muscles that stretch and contract. If you look at a human foot, the distance from the toes to the ankle is about twice the distance from the ankle to the heel. Therefore, if you stand on your toes, the force applied to your Achilles tendon is about twice your weight due to the principle of the lever. If you were to jump when your muscle is extended, you could tear your Achilles tendon due to excessive strain. Make sure you stretch before you work out to loosen up your muscles. This will prevent any excessive strain on your Achilles tendon. I hope energy will bring you all happiness. Our magic word is "Happy Energy!"