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Causal transfer function analysis was applied to the heart rate variability and blood pressure variability in normotensive male Sprague–Dawley rats those were measured before, during, and after acute restraint stress. The causal transfer gain (CTG) from systolic blood pressure (SBP) to RR interval (RRI) and CTG from RRI to SBP were estimated. The mean value of the CTG from SBP to RRI in the low-frequency...
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