The unusual deathoccurredMonday evening at the On Air gym in east-central Paris, according to local law enforcement.
A second woman, age 34, was critically injured and is currently in intensive care.
Cryotherapy, or cryostimulation, is an emerging practice.
A cryotherapy machine chilled using liquid nitrogen.© Jacob Lund via Shutterstock
Cryotherapy machines often use chilled liquid nitrogen to produce these temperatures.
But when its a gas, nitrogen is both odorless and colorless.
That seems to be the case here.
Both women were in cardiac arrest by the time emergency services arrived.
But authorities say that they are still conducting an investigation into the matter.
Cryotherapy-related deaths are rare, but not unheard of.
In 2015, for instance, a spa employee in Las Vegasdied accidentally of suffocationfrom using a cryotherapy machine.
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