Thanks Pete. That explains it well.
I'll try hyperventilating next time and see if it makes a difference.
It also explains why I am so bad at dynamics. For static I use a 5mm opencell suit, so I don't usually get cold, but for dynamic I use a 3mm suit which is baggy and doesn't keep me warm. My dynamic performance is very bad, one of the worst among the freedivers I train with, despite my good static times. The problem is that I get tired quickly and a strong urge to breathe starts after about 20m. This means that the longest I can do is about 40m. As the session progresses I get colder and my distances get shorter.
It's good to know what the problem might be, so that I can work on it.
Lucia
