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Figure 4


Fig. 4. Relative heart rate variability (HRV) parameters in a rattlesnake, carrying ECG electrodes and a peritoneal cannula (a short section of the raw data shown in Fig. 3), during rest (A), after treatment with propranalol (B) and atropine (C). Ai-Ci, heart beat interval tachogram; Aii-Cii, heart beat intervals as a probability distribution histogram; Aiiii-Ciii, power spectrum calculated by applying power spectral analysis to the heart beat tachogram in Ai-Ci.





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