Fig. 3. Ventilation of septum removed (SR)- (triangles) and sham-operated (SO)-tegus (circles) resting during the night (open symbols) and at rest and activity during the day (filled symbols). The start of exercise at 0.17 m s^-1 and the beginning of the recovery period after exercise at 0.28 m s^-1 are defined as zero. Exercise at 0.17 m s^-1 (grey bar) was terminated after 5 min, whereas exercise at 0.28 m s^-1 (black bar) lasted until exhaustion of the animal. E_O2, oxygen extraction; VB_O2, oxygen uptake per breath; _O2, oxygen consumption; E/_O2, air convection requirement. Values are means ± S.E.M., N=5. ^*Significantly different (P0.05) from all other values of a group; ^xsignificantly different (P0.05) from the pre-exercise; ^#significantly different (P0.05) from 0.17 m s^-1; significantly different (P0.05) from 0.28 m s^-1. BTPS, body temperature, barometric pressure saturated; STPD, standard temperature and pressure, dry.