Yeah, I'm not sure if this is your problem but I know that holding your breath when you run is a big no. It causes you to lose your breath sooner and makes whatever you're doing very hard. Sound familiar? If you go out running try and think about how you breathe so we know this is something you actually need to work on.
Holding my breath was always a problem for me when I ran and I needed to think about how I would breathe during the beginning of the basketball season so I could get back on track. But however you train is how you're going to perform, or at least that’s what I get drilled into my head
So if you hold your breath when you train then that’s what you'll do when you aren't thinking. How you performed when you tumbled doesn't really concern me but holding your breath during conditioning? Not good.
I'm a little curious now. I've asked my teammates that played basketball in high school and they gave me some mixed answers so I'm going to ask a trainer about it tomorrow morning and I'll get back to you with some answers and possible things that may help if I'm right.