Deliberate cold water exposure reliably increases epinephrine levels and improves focus and concentration.

“If we look to that study from DeGroote et al, the acute stress improves cognitive performance study, they measured concentration before and 30 minutes after the stress was induced and there does appear to be a quite long lasting, really up to an hour or more effect of increasing epinephrine.”

“Cold water exposure, I should say deliberate, cold water or non deliberate cold water exposure reliably increases epinephrine levels. It is incredibly useful as a tool for this, and it is in fact, zero cost or even negative zero cost. How could it be negative zero cost? Well, you can certainly save on your heating bill by taking a cold shower so that's one way.”

“Epinephrine is a neurochemical that will place your vision into more of a tunnel mode, which will allow you to focus on cognitive work or physical work in a more specific way, you're not going to be as distractable, and it's very easy to achieve by getting into a cold shower or a cold body of water for a brief period of time.”

“it's all just a reliable source of inducing adrenaline release. And you get out of a cold shower, you have more energy, and that energy couldn't have been caloric energy, it's adrenaline.”

“you get into the cold shower and if it's cold enough that will be stressful you will experience an increase in epinephrine it will increase your alertness”