DunDunDunpachi
Banned
(guided breathing video if people wish to learn / follow along)
I've been doing this since last August. I'm typing this outside in a thin t-shirt and shorts, in ~40*F/4.4*C temp. I can feel the cold, but my body isn't shivering. I just tolerate it. I bike for 1 1/2 hours several times a week (to/from work) in shorts and t-shirt as well and I can manage the trek fine. I don't get sick from all this cold exposure, either. Last year, I was walking around in the snow barefoot in nothing but sports shorts. That... was pushing the limits of my tolerance, I won't lie. It was quite extreme, but I never once broke out in shivering or caught a cold. One day I actually built a snow-fort with my kids in nothing but shorts. Spent an hour out there in sub-freezing temp. The sunlight helped, admittedly.
So now that I've established how thoroughly crazy I am, would you like to learn what led me to do this?
The idea is to build up brown fat. In order to stay warm, most people must resort to shivering. However, if the body has sufficient stores of brown fat, your ability to maintain internal temperature is improved. Brown fat is dense tissue full of mitochondria. It's main purpose is to burn calories to generate body heat. That's pretty much it. Babies have a lot of it because they cannot shiver. Burns calories. Keeps you warm.
Well, if you gradually expose yourself to cold temperatures, your body will start converting yellow fat into brown fat. And this brown fat also is burning calories while you expose yourself to the cold. You can do this by taking cold showers, wearing fewer layers of clothing, turning down the thermostat in colder months, and walking outdoors in the cold. The Japanese have been studying this phenomenon as well.
If you shiver, you're done. Put on more clothes and go about your business. The goal isn't to torture yourself in the cold. You are supposed to gradually introduce yourself to longer stretches of time and colder temperatures, gauging yourself as you go.
Has anyone else heard of this or tried it themselves? If nothing else, I can definitely tolerate much colder temperatures than I ever could. Growing up, 60*F was considered "make sure to put on a jacket or hoodie" weather. Now I can tolerate sub-freezing for quite a while.
Since winter is coming for many people, might be a fun thing to investigate and try out for yourself.
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