Hi
if you have access to a scientific library, you may go to
PubMed Home and enter keywords: apnea diving or breath-hold diving , that gives most of the recent references, online is the abstracts free to read.
I would like to recommend the workshop proceedings from last year that I organized with main sponsoring from UHMS and DAN, it is supposed to be written in a format that non-doctors should understand. It cost about 20 US and can be ordered online from
DAN Divers Alert Network - Scuba Diving and Dive Safety Association (I dont get any money for this

, it was a scientific workshop but DAN offered to sponor it and take care of the distribution of the book, its about 150 pages with articles and lots of discussions among the scientists, doctors and divers there.
We also had divers like Tanya and Martin and Kirk presenting material, plus lots of intereting talks from scientists.
It can be found in the online shop as Breath-Hold Diving 2006 Workshop Proceedings
Dr Peter Lindholm