Key result
Nonlinear analyses demonstrated that the dynamics of heartbeat intervals, sympathetic nerve activity, and blood pressure in rats is low-order chaos, with sympathetic nerve activity leading changes.
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Should not yet alter clinical autonomic management; leaves open whether rat sympathetic-led chaos extends to human cardiovascular dynamics.
The mechanism of 1/f scaling of heartbeat intervals remains unknown. We recorded heartbeat intervals, sympathetic nerve activity, and blood pressure in conscious rats with normal or high blood pressure. Using nonlinear analyses, we demonstrate that the dynamics of this system of three variables is low-order chaos, and that sympathetic nerve activity leads to heartbeat interval and blood pressure changes. It is suggested that impaired regulation of blood pressure by sympathetic nerve activity is likely to cause experimentally observable steeper scaling of heartbeat intervals in hypertensive (high blood pressure) rats.
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Osaka et al. (2003) studied Normal or high blood pressure. Sympathetic nerve activity and blood pressure regulation was evaluated on 1/f scaling of heartbeat intervals and system dynamics. Nonlinear analyses demonstrated that the dynamics of heartbeat intervals, sympathetic nerve activity, and blood pressure in rats is low-order chaos, with sympathetic nerve activity leading changes.
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