I did teakwondo and kickboxing. When I was starting Teakwondo (~16 year old) first sparrings were dominated by fear and anxiety. I didnt know how to act, what to expect, I was physically shaking. Fast forward few months and I was in control, anxiety turned into excitement, fear into caution. My body and mind learned to use that sudden adrenaline injection to my advantage. Two years later I moved to kickboxing. Its very different sport, more violent, faster and can be significantly more painful in the ring, nonetheless my experience from teakwondo translated perfectly. Since then I had couple of dangerous situations on the street (drunk idiots, football fans etc) and again I was in control of my body and reactions, my previous experience of being punched repeatedly in the face inside the ring helped me stay calm :)
Second example is virtual. Eve Online is a space themed MMO. Everything you own in the game has to be earned or paid for with real money, and all losses are persistent and final. Someone kills your ship worth two months of heavy missioning? its GONE forever. This design choice makes Eve Online the only computer game inducing real fight-or-flight reaction that I know of(outside tournaments/leagues). Losses can be as small as 10 minutes of your time (couple of cents), and as severe as $1000 blink mission ship you spend whole last year to build. First PVP fights in Eve were exactly the same as my first sparring 10 years before :) heart pounding, hands shaking, sphincter gripped tight etc :) and mistakes ending in expensive wrecks. It took some time and experience to fully take control of the situation.
Can write something about bike riding(crashing), but it will be the same story again :)
I wonder if pilots with military background, trained in battle sims in high pressure situations, are significantly better at handling emergency. My own experience makes me think definitely yes.
Human instinct is to slow down, but on a bike this will have the effect of widening your turn radius—totally counterproductive. To tighten the turn radius, you need to accelerate and lean in (which you can do unless you're already dragging a knee).
Or when you're on ice and you really want to turn but just have to keep going straight until you hit a patch where you'll get some grip from the mountain cover.
I found this out by accident after being prescribed a beta-blocker for typical blood pressure reasons while I was trying to deal with some panic-attack issues that were serious enough to need a mild benzodiazepine. After starting the beta-blocker, the need for the benzo just went away. While the benzo was effective at blocking part of the recursive/positive-feedback loop of panic, the beta-blocker was much better at preventing the feedback loop from forming at all.
Later on, a friend of mine who attended RISD mentioned that the drug of choice that was sought by all the art students was beta-blockers, so they could present their projects without all the stage fright.
/* obDisclaimer: This is not medical advice. Taking any drug can be dangerous. See a real doctor. etc */