the.com/cryotherapy

Paying to stand in a freezer so your body thinks it's dying, briefly.

means A treatment that exposes the body to extremely cold temperatures for a short time, used to reduce inflammation, numb pain, or (depending who's selling it) supposedly boost recovery and wellness.

from Built from Greek roots: 'kryos' meaning icy cold or frost, and 'therapeia' meaning healing or treatment — the same '-therapy' suffix found in physiotherapy and chemotherapy. The cold-as-medicine idea itself is ancient, with physicians from Hippocrates onward noting ice's numbing, swelling-reducing effects, but the whole-body cryo-chamber version is a modern invention, developed in Japan in the late 1970s to treat arthritis before spreading into sports recovery and spas.

temp range
negative 110 to 140 celsius, colder than antarctica
duration
usually under 3 minutes, frostbite math matters
evidence base
thin for fat loss, decent for soreness and swelling
origin
invented in japan in 1978 for arthritis
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