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Original recordings of arterial blood pressure (BP, top), heart rate (HR, middle), and respiratory frequency (RF) obtained during the protocol with increasing stimulation frequencies ranging from 2 Hz to 20 Hz (left) and increasing pulse durations ranging from 0.02 msec to 20 msec (right). The lowest pulse duration of 0.02 msec was only tested in one more animals and, therefore, the pulse duration of 0.02 msec was not included in any statistical analyses.
