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Dynamic nonlinear vago-sympathetic interaction in regulating heart rate

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Summary

Although the characteristics of the static interactions between the sympathetic and parasympathetic nervous systems in regulating heart rate have been well established, how the dynamic interaction modulates the heart rate response remains unknown. Thus, we investigated the dynamic interaction by estimating the transfer function from nerve stimulation to heart rate, using band-limited Gaussian white noise, in anesthetized rabbits. Concomitant tonic vagal stimulation at 5 and 10Hz increased the gain of the transfer function relating dynamic sympathetic stimulation to heart rate by 55.0% ± 40.1% and 80.7% ± 50.5%, respectively (P < 0.05). Concomitant tonic sympathetic stimulation at 5 and 10Hz increased the gain of the transfer function relating dynamic vagal stimulation to heart rate by 18.2% ± 17.9% and 24.1% ± 18.0%, respectively (P < 0.05). Such bidirectional augmentation was also observed during simultaneous dynamic stimulation of the sympathetic and vagal nerves independent of their stimulation patterns. Because of these characteristics, changes in sympathetic or vagal tone alone can alter the dynamic heart rate response to stimulation of the other nerve. We explained this phenomenon by assuming a sigmoidal static relationship between autonomic nerve activity and heart rate. To confirm this assumption, we identified the static and dynamic characteristics of heart rate regulation by a neural network analysis, using large-amplitude Gaussian white noise input. To examine the mechanism involved in the bidirectional augmentation, we increased cytosolic adenosine 3′,5′-cyclic monophosphate (cAMP) at the postjunctional effector site by applying pharmacological interventions. The cAMP accumulation increased the gain of the transfer function relating dynamic vagal stimulation to heart rate. Thus, accumulation of cAMP contributes, at least in part, to the sympathetic augmentation of the dynamic vagal control of heart rate.

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Authors and Affiliations

  1. Department of Cardiovascular Dynamics, The National Cardiovascular Center Research Institute, 5-7-1 Fujishirodai, 565-8565, Suita, Osaka, Japan

    Kenji Sunagawa, Toru Kawada & Tsutomu Nakahara

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  1. Kenji Sunagawa
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  2. Toru Kawada
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  3. Tsutomu Nakahara
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Sunagawa, K., Kawada, T. & Nakahara, T. Dynamic nonlinear vago-sympathetic interaction in regulating heart rate. Heart Vessels 13, 157–174 (1998). https://doi.org/10.1007/BF01745040

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