After coming across people with depression and fatigue and experiencing a small amount myself recently (but with no anxiety), I was reminded of the effects of using extremely cold water years ago when the hot water heater broke and the landlord didn't get it fixed right away. I noticed this had a huge effect on me chemically and hormonally and it caused a huge increase in breathing in and out (in the shower) which causes increased oxygen to the brain. Other things I believe happen like increasing noradrenaline and possibly some other hormones as well. It woke me up more than any caffeine ever did which shows that is clearly has a physiological affect. This could be a coincidence but I remember during that time when the hot water heater was not working, I had much less depression, more energy, and was able to get out of bed much easier. I was doing some other things at the time though as well so it might have not been the cause.
I did some very quick research and found this article here:
https://www.ncbi.nlm.nih.gov/pubmed/17993252
If anyone decides to experiment with this please post back here. I just did and got a very temporary cold forehead and increased breathing (went down after shower). It was rather exhilarating. The problem was, I took a hot shower for a long time before and then switched it to cold water for a fairly short amount of time. I'm thinking about just getting in next time without the hot shower.
I also found this article on the internet but do not know if everything is 100% accurate:
http://www.menprovement.com/benefits-of-cold-showers/
I did some very quick research and found this article here:
https://www.ncbi.nlm.nih.gov/pubmed/17993252
If anyone decides to experiment with this please post back here. I just did and got a very temporary cold forehead and increased breathing (went down after shower). It was rather exhilarating. The problem was, I took a hot shower for a long time before and then switched it to cold water for a fairly short amount of time. I'm thinking about just getting in next time without the hot shower.
I also found this article on the internet but do not know if everything is 100% accurate:
http://www.menprovement.com/benefits-of-cold-showers/