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Fig. 2. The effects of varying chemoreceptor thresholds on durations of dives (td, solid lines) and surface intervals (ts, broken lines). (A) The effect of decreases in central chemoreceptor threshold (Tc) during surface hyperventilation ({Delta}Tc, mmHg) at each of four different levels of peripheral chemoreceptor threshold (Tp, mmHg). Tc during dives was always 37.4 mmHg. Tp was constant across the dive cycle: circles, Tp=39.1 mmHg; triangles, Tp=37.4 mmHg; squares, Tp=35.7 mmHg; diamonds, Tp=34 mmHg. (B) The effect of variation in Tp on ts and td at constant {Delta}Tc (-5.1 mmHg). Note that increasing Tp represents decreasing peripheral chemoreceptor responsiveness to CO2 and O2.





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