[TheRunningNerd]

Einfach nur Hand einfrieren bringt eben grad nix, weil sich diese erwähnten Adern dann zusammenziehen, daher das Vakuum in dem Handschuh (wenn ich das richtig verstehe):

When Grahn sticks his hand in the airtight glove, the device creates a slight vacuum. The veins in the palm expand, drawing blood into the AVAs, where it is rapidly cooled by water circulating through the glove's plastic lining.

The method is more convenient than, say, full-body submersion in ice water, and avoids the pitfalls of other rapid palm-cooling strategies. Because blood flow to the AVAs can be nearly shut off in cold weather, making the hand too cold will have almost no effect on core temperature.

Also evtl. noch den Staubsauger ans Gefrierfach anschliessen.