harmonica studies 1.8 and 2.1 breathing

Hi David

I can play solo studies 1.8 and 2.1 without it being noticeable that I am running out of breath, but if I try to loop them then I run out of breath on bar 2 or 3 the next time around.

I assume the idea is to be able to play these several times in a row?

I am trying to use the diaphram rather than the chest and not playing too loudly but it's a real struggle if I try and loop them. Is this something to worry about and if so is there anything obvious I might be doing wrong?  I find it a real struggle with so much on the inhale.

Thanks

Chris