An artificial thorax (1) with at least one deformable air reservoir (2) having an internal volume (3) containing air and a first orifice (4) in fluidic communication with the internal volume (3), the deformable air reservoir (2) deforming, and at least some of the air leaving the internal volume (3) via the first orifice (4), when a user exerts a manual compression action, directly or indirectly, on said deformable air reservoir (2). The artificial thorax (1) has a CO2 source (10) containing gaseous CO2, such as a gas cylinder, connected fluidically (11) to the internal volume (3) of the deformable air reservoir (2) in such a way as to supply said internal volume (3) with gaseous CO2.
