A short YouTube clip in which Dave Asprey advocates brief cold exposure (cold water on forehead and chest after a hot shower) and claims that repeated one-minute exposures over several days increase cardiolipin in cell membranes, improving mitochondrial heat production and efficiency. He describes a progression of tolerance over days (from a strong survival signal to longer durations) and mentions physiological responses like blood shunting from skin and adrenaline release.
Chapters
Let's talk about showers. These cells in your body, the mitochondria, the first thing they do is they make heat. We're not reptiles. We make our own heat. What happens if, at the end of your hot shower, you put cold water on your forehead and your chest? Within about eight seconds, you'll get a strong signal from your body that says, I'm going to die, and you're going to jump out of the water. You're not going to die. You know you're not going to die, but your body tells you that very strongly, and you'll get out of it. But if you do it again, the next morning, you're going to last for about 30 seconds. And then next morning, maybe 50 seconds. And all of those times, you're gonna be saying, dave Asprey's a jerk, and this is uncomfortable. But the fourth day, something magic happens. And you can Google this. It's called cardiolipin. After three days of continuous cold exposure for just one minute, or as close as you can get, your cell membranes shift to contain more cardiolipin, which allows them to make heat more effectively and to run more efficiently. All of the blood leaves your skin and goes to keep your organs warm, so you get a concentration of oxygenation. Awesome. And probably some adrenaline to keep you warm.