I have exactly the same thing, I figured it was just my brain getting used to the adrenaline although I have no evidence or measurement of this.
I also experienced a variation of it when I did karate. During sparring, once my sparring partners hit me for the first time, I was able to start focusing on sparring and not the fear of being struck.
https://www.thecrimson.com/column/a-night-at-the-symphony/ar...