Your body function

Crunching in the joints has various sources, today we will zoom in on the most relevant in our opinion.

A joint is the union of two or more bones🦴 which are covered by cartilage. This joint is mobile and inside the joint we find the synovial layer. This has vascular and nerve supply and has a regulatory capacity. This layer produces synovial fluid that prevents friction, ensures smooth gliding of the articular surfaces and nourishes the cartilage.

However, air can get into the synovial fluid 🌬. If we stretch the joint, the negative pressure in the joint sucks carbon dioxide and oxygen into the synovial fluid. These gases combine in the fluid to form large bubbles 💭 which can then burst. And this bursting can even be audible 👂.

But according to some research, the loud sound is produced when a bubble 💭 forms in a joint and not directly by its exploding 💣.

And I'm sure you're wondering if cracking in joints is harmful ❓
Be careful here, there's no such thing as cracking. The above described cracking in the joints according to research is not harmful. Cracking can also be caused by structures rubbing against each other. Or in very thin people, a tendon running over a bone makes a loud sound. Be careful in these cases and consult it with a physiotherapist or a doctor 👨⚕️.

There are more theories about the origin of the crunching, such as the theory of the meniscoid pinching, the theory of cartilage sticking or muscle spasm.
Do you know any other theories of how crunching in joints arises? Let us know in the comments 😊

In these days, immunity is important, so... How long do you sleep every day?
Sleep 💤 affects various immune parameters, reduces the risk of infection and can improve vaccine responses 💉.
This happens by regulating immunological markers and cells. T lymphocytes are a type of lymphocytes (white blood cells), which protect us from harmful substances. Research shows that sleep💤 improves the ability of T lymphocytes to fight harmful substances. If we don't get enough sleep, we reduce the production of T lymphocytes, which can lower our defence mechanisms and make us more susceptible to infections🤕.
How about COVID-19 and sleep?
Sleep affects immunity. The COVID-19 pandemic can promote sleep disturbances😴 and impair immune function🤧 because immunological markers are upregulated. The psychological problems induced by the COVID-19 pandemic change circadian rhythms, compromising sleep quality and therefore the immune system.
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This is also why sufficient sleep is important.
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