vocal health Help! In Need of Advice. Strained/Airy Voice

[karen22]

Hi. I'm in need of help and good advice. After an hour or less of singing during my solo practice sessions or band rehearsals, my voice gets too airy. A sort of airy tone gets mixed with my voice, which is due to vocal strain. I'm attaching samples of my fresh voice and after 1 hour so you can compare. The airiness is most audible in single note "Ah". I may be too picky about this, but I want to know is this normal after an hour or what? I want to be able to sing with my clear voice during the whole show. I would appreciate very much if anyone can give a me good advice on how to avoid or at least minimize this. Thank you.

1- fresh voice.mp3

2- after 1 hour.mp3