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Comment by DenisM | Hacker News Reader

I keep track of my excersize performance - amount of work, heart rate and ambient temperature. I have certainly noticed positive correlation - for every centrigate of room temperature drop I perform about 1% more work (keeping the heart rate the same in all cases).

But this. Wow. 1000 push ups at 65 years old? Truly dramatic. I should buy one.

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I wonder if this is a case of over-engineering a solution. Does it have that much more of a positive effect compared to a lower tech solution (e.g., bag of ice). The machine costs $2500 retail.

Or hands in cold water. It's surely not as good, but if the effect is so dramatic, it would still have a noticeable impact. Easy to test.

My understanding is that hands in cold water will lead to blood vessels contracting and thus the entire body not being cooled, just your hands being kinda cold. Their device keeps blood vessels expnaded thus inducing hypothermia.

The diference is between chilling entire body and only your arms.

Do you know why this happens, or how they circumvent it?

Is it because it is water (i.e. not air-cooled)? Or is it because the temperature differential is too great (i.e. dangerously so, according to the body)?

A damp towel might overcome these issues - or wetting your hands and holding them in front of a fan, for evaporative cooling via fake sweat + fake breeze.

If I remember correctly, the glove lowers the air pressure to keep the blood flowing.

They make a partial vacuum in the glove that basically sucks the blood to the surface of the hand where it can pick up the coldness.

I've got a ~$120 vest full of a gel that freezes at 50 degrees, so it's not painful to wear. I use it as A/C on my motorcycle here in Florida; but my marathon-running co-worker says he's seen people wearing them for a few hours before races, to lower their core temperature. Looks like it works, but it can be done cheaper.

to be fair once you break the 100 barrier you can pretty much go forever. pushups aren't that hard because you're only pushing about 2/3rds of your body weight.

lots of pullups however IS impressive.

What do you mean exactly? How do you measure work?

If he is doing weight training, work = mass * gravity * height.

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