[hteas]

At present my static training consists of negatives twice a week. I feel like they are better for spearfishing or recreational diving, since I reach the point of desperation much more quickly, and can do more of them during a lunch break training session. I exhale to start, then exhale any residual air every 5 seconds for the first half minute, then hold for a long as I can. Recoveries are 60 seconds. I'm sitting at my desk, so there is little danger of BO or LMC, except in the minds of co-workers.
One thing about the negatives that surprises me is that I get a lot of body rushes during breathholds from physiological adaptations and the CO2 reflex, but I never get contractions. On full lung breathholds I typically get my first contraction at 2:30 to 3:00, but have never had one doing negatives.
Anyone else notice this?
Howard