Technically taken, it is still hyperventilation, as far as I can tell. Maybe it is not extreme, but it is hyperventilation, and very likely it leads to decreased CO2 level. If you can measure the tidal volume of your breath (or estimating it by % of your measured pulmonary vital volume), and count the number of breaths per minute, you can calculate the O2 saturation and CO2 dropping with the online calculator at
AltitudePhysiology.org.
