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Fig. 1. A representative recording from one varanid lizard (post exercise) demonstrating that costal ventilation caused phasic alterations in post caval blood flow (PC) and intra-abdominal pressure (PIA). A 25.0 ml expiration increased PC by 6.91 ml min-1 and PIA by 2.21 mmHg. A 23.3 ml inspiration decreased PC by 3.61 ml min-1 and PIA by 2.97 mmHg. The effect of respiratory cycle variations in PIA was a net increase in PC, comparable to the respiratory pump in mammals. Note: PC blood flow was pulsatile with a rate that was strongly correlated with heart rate. Gular pumps (*) decrease PIA slightly, but do not alter PC beyond fluctuations due to heart rate variability. Trace taken 10 min after exercise at 30°C in V. exanthematicus (mass 502 g). Scale bar, 15 s. 1 mmHg=133.3 Pa.





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