I recently ran across this article:
“Using the RTX system while exercising under a thermal load increased athletes’ endurance by 25%, increased the initial recovery rate by 50%, and increased fat oxidation by 15% - meaning the athletes burned a greater percentage of fat instead of carbohydrates during exercise.”
Apparently, it’s not exactly the same as the old trick of running your hands/wrists under cold water. When you do the latter, your blood vessels contract and restrict blood-flow. This device uses a vacuum to draw blood to the skin and keep up blood-flow.
Anyway, I thought this was fun food for thought.