Fig. 2. 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 till exhaustion of the animal. T_TOT, duration of total respiratory movements; fR, breathing frequency; VT, tidal volume; E, total ventilation rate. Values are means ± S.E.M., N=5. ^*Significantly different (P0.05) from all other values of a group; significantly different (P0.05) between SO- and SR-tegus; ^xsignificantly different (P0.05) from pre-exercise; ^#significantly different (P0.05) from 0.17 m s^-1; significantly different (P0.05) from 0.28 m s^-1.