This dataset is presented in the manuscript titled: 'Discontinuous gas exchange in Madagascar hissing cockroaches is not a consequence of hysteresis around a fixed PCO2 threshold'; published in JEB. The primary purpose of this investigation was to test if discontinuous gas exchange cycles (DGCs) were caused by PCO2 fluctuations around ventilatory setpoints. Madagascar hissing cockroaches were exposed to normoxic acapnia and treatments of either hypoxic acapnia, and normoxic hypercapnia, while displaying continious gas exchange, and...