Fig. 4.

Relationship between Pet_CO2 and Pa_CO2 tensions during the clamping procedure directed toward restoring Pet_CO2 tension to preheat stress levels. The clamping procedure similarly increased Pet_CO2 (7.5 ± 2.8 mmHg) and Pa_CO2 (6.6 ± 3.4 mmHg) tensions relative to their respective preclamp heat stress values, indicated numerically in each column (i.e., heat stress 2; A). This finding is further confirmed by linear regression analysis, which identified a significant correlation between Pet_CO2 and Pa_CO2 (B). These finding indicate that Pet_CO2 tension accurately reflects Pa_CO2 tension during this clamping procedure.