I'm curious as to how long and how cold the immersion needs to be. Two hours, three hours? What is the length of time to get the dopamine effect you mention multiple times. This is what a quick literature search revealed to me:
"A single cold water immersion (head-out, at 14 degrees C, for 1 h) increased sympathetic nervous system activity, as evidenced by a four-fold increase (P < 0.05) in plasma noradrenaline concentration. Plasma adrenaline and dopamine concentrations were not increased significantly."
Immersing yourself in cold water for about 2-3 minutes initially, and working your way up gradually until it's uncomfortably cold. Do this 4 times a week if you can.
I'm curious as to how long and how cold the immersion needs to be. Two hours, three hours? What is the length of time to get the dopamine effect you mention multiple times. This is what a quick literature search revealed to me:
"A single cold water immersion (head-out, at 14 degrees C, for 1 h) increased sympathetic nervous system activity, as evidenced by a four-fold increase (P < 0.05) in plasma noradrenaline concentration. Plasma adrenaline and dopamine concentrations were not increased significantly."
https://pubmed.ncbi.nlm.nih.gov/8891513/
Immersing yourself in cold water for about 2-3 minutes initially, and working your way up gradually until it's uncomfortably cold. Do this 4 times a week if you can.