So, having heard about the “new” hype on hand cooling for a couple of years, as recognized by Huberman et al, with favourable user reviews - I decided to try it for myself.
For the ones not initiated, it’s simplified a theory that heat production is a major factor in exhaustion (muscle failure), and that by cooling hairless skin of the body (namely hands) you recover faster thus performing better, longer or stronger. Appearantly there is arteriovenous anastomoses (vessel connections) in the hands (also in the face and soles of feet - go figure) where excess heat is preferrably expedited out of our bodies. By holding, not pressing hard, something cold (7-15 degrees Celsius) for 2-3 mins you’re supposed to get the most out of it.
I bought and tried one of the more common, basic devices on the market. An aluminium tube with a thermometer attached. You just fill it with cold water, or keep it cool in the fridge. You can probably make one yourself (but bear in mind the temperature range is critical).
Having tried it for 3 weeks, being critical at first, I honestly have to admit that it works! I used it as directed in between heavy powerlifting sets, in shorter bursts during more HIT-based workouts - and the thing is: I can actually perform both heavier and/or longer sets (also longer sessions) without getting as exhausted as I used to be. It’s not a life and death difference, but enough to clearly notice! Also, I’ve noticed a significant DOMS reduction.
This means i highly recommend anyone trying this for their own performance benefits. All in all, it rests on a solid physiological foundation.