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For the German readers:
And for those who can't understand german: There are some pictures, too.
(Don't know how long this link will work. It is from one of the most visited webpages in Germany!)
Apnoe-Tauchen: Weltrekordler Sietas schafft 213 Meter mit einem Atemzug - Sport - SPIEGEL ONLINE - Nachrichten
- What was he saying about needing a little "lift" at the beginning? Maybe the translation just isn't good, but did he say that he likes to have slight positive buoyancy at the beginning?
- He hyperventilates for 10 minutes before the start? I've only seen one video of him, the one in which he does an O2 static of over 16 minutes, in which it appeared that he practiced rather aggressive hyperventilation for several minutes before his performance. Does he always hyperventilate that much?
- Maybe the translation is bad, but did it say that his pulse was only 45 when he started the performance? Even after all the hyperventilation? I don't see how that's possible. It seems impossible to keep one's heartrate below even 100 with hyperventilation.
One of the reasons Tom is able to keep a low hart rate at the start is because he does not inhale to the max using lots of muscle efford , but after a big below max gulp gradual fills up his lungs to way above max by small (but lots and lots and lots) of packs.
Regarding his contractions. I asked him some time ago and like most 'normal' fredivers he gets contractions around 3:30 or around, but manages to withstand them for 6-7 minutes. This may have changed some since this was about 1,5 years ago but his technique is not revolving around delaying contractions but rather ignoiring them over a very olong period.
Regarding neckweights. Lots of people underestimate how much you need for a perfect trimmed body in nofins. Even with my small 6 liter lungs and only a 3 mm pants i need around 3,5 kg's to be perfectly horizontal.
Add several liters air and a 3 mm top and you need massive more kilos. But this can be very different for each person depending on build.