[derelictp]

Thanks Eric,

The factor you mentioned is the reason why I started with this experiment.

I am thinking that maybe my relaxation time before the breathhold without warmup was too short?

I took about 10min of relaxation/breathup.

Maybe there are other factors that made me not so successful without warmup?

Maybe the positive changes with warmups is bigger than the negative effect, (hypoxia waste products) and in total, warmups is beneficial?

Maybe there is methods to achive the 5 adaptations you mentioned without warmups?