Kenney M J
Department of Anatomy and Physiology, College of Veterinary Medicine, Kansas State University, Manhattan 66506.
Am J Physiol. 1994 Sep;267(3 Pt 2):R830-40. doi: 10.1152/ajpregu.1994.267.3.R830.
Frequency-domain analyses were used to characterize basal sympathetic nerve discharge (SND) and to determine the relationships between the activity recorded simultaneously from sympathetic nerves in chloralose-anesthetized, baroreceptor-innervated rats. Discharges were recorded from the splanchnic, renal, and lumbar nerves. The following observations were made. 1) Approximately 65-75% of total power in SND was contained below 9 Hz in either baroreceptor-innervated rats or baroreceptor-denervated rats. 2) Coherence values relating the activity of two nerves were significantly different from zero within this frequency band. 3) The interval between the discharges of two sympathetic nerves was either frequency dependent or constant within the coherent frequency band. 4) The frequency components of SND and the relationships between the activity in two sympathetic nerves could be altered during periods of acute stress. These results suggest that the system responsible for basal SND in rats is composed of either multiple sympathetic generators or multiple filters arranged in parallel, which are capable of producing different outputs. The dynamic nature of these circuits was revealed by the changes that occurred during periods of acute stress.
频域分析用于表征基础交感神经放电（SND），并确定在水合氯醛麻醉、有压力感受器支配的大鼠中，从交感神经同时记录的活动之间的关系。从内脏神经、肾神经和腰神经记录放电。得到以下观察结果。1） 在有压力感受器支配的大鼠或压力感受器去神经支配的大鼠中，SND总功率的约65 - 75%包含在9Hz以下。2） 在该频带内，两条神经活动的相干值显著不同于零。3） 在相干频带内，两条交感神经放电之间的间隔要么与频率有关，要么是恒定的。4） 在急性应激期间，SND的频率成分以及两条交感神经活动之间的关系可能会改变。这些结果表明，负责大鼠基础SND的系统由多个交感神经发生器或多个并联排列的滤波器组成，它们能够产生不同的输出。这些回路的动态特性通过急性应激期间发生的变化得以揭示。
