I went and did the Wim Hof thing at a stadium in London - it's great fun and if you can ignore the somewhat culty environment, you'll enjoy it for sure if you're interested in these kinds of things (meditation, new agey things).
Anyway, prelude out of the way - are you sure it's adrenaline that WHM triggers? When we did it, it was essentially CO2-purging breathing and triggered an endorphin high, like a mild MDMDA effect. Either way, it definitely made ice-bath dunking more tolerable (part of the experience is a stadium full of people all going outside in flipflops and sitting in paddling pools full of ice), but I definitely felt the cold.
CTRL+F on "epinephrine" in [1]. There are a couple of charts that show it was much higher than the control. Dopamine, as a hormone not as a neurotransmitter (I think), was also measured and seemed to be lower or equal compared to control.
But I can see why you say it's a mild MDMA effect, the WHM does a lot more than just adrenaline, but I simply use it for that. And I definitely notice the adrenaline effects of it as well. But I do agree there's more to it.
Anyway, prelude out of the way - are you sure it's adrenaline that WHM triggers? When we did it, it was essentially CO2-purging breathing and triggered an endorphin high, like a mild MDMDA effect. Either way, it definitely made ice-bath dunking more tolerable (part of the experience is a stadium full of people all going outside in flipflops and sitting in paddling pools full of ice), but I definitely felt the cold.