AMA #47: Cold therapy: pros, cons, and its impact on longevity

Cold water immersion, as it suggests, is you are immersed in cold water. The most common protocols you'll see could be as cold, frankly, as ice water—so that's 32 degrees. But typically, in research studies, you're kind of seeing more, sort of, 40 degrees Fahrenheit up into the 60s.

A meta-analysis can only be as good as the sum of its parts, and if its parts are very heterogeneous, which they often are, but not heterogeneous in the right way, then your analyses are somewhat limited.

Truthfully, anybody who's done both will tell you that cold water immersion is much subjectively colder than whole-body cryo.