I ran my first post-graduation run yesterday evening, warm but breezy conditions, along the sea front. Unusually, I had the sensation about 20 mins in of finding breathing harder than usual - it felt like I couldn't get enough air into my lungs without really lifting my chin and expanding my chest as much as I could - and kind of forcing the air in.
I tried slowing right down, but I started to feel like I couldn't catch my breath properly, and a little bit dizzy, so I actually stopped at that stage. After about 30 seconds the sensation had passed, and I got going again but very slowly, then finished the run ok.
It's hard to describe, but I think I breathe quite shallowly normally - so is what I'm experiencing just my body getting used to working harder - or are there things I can do to improve? I have tried breathing in through my nose and out of my mouth, but seem to get even less air in that way, so I opt for the mouth.. and probably look a little like a basking shark when I run..
Can anyone help with this one? the dizzy bit was a little scary