INFLUENCE OF CARDIAC NEURAL INPUTS ON RHYTHMIC VARIATIONS OF HEART PERIOD IN CAT
INFLUENCE OF CARDIAC NEURAL INPUTS ON RHYTHMIC VARIATIONS OF HEART PERIOD IN CAT
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DOI：
10.1152/ajplegacy.1975.228.3.775
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发表时间：
1975-01-01
影响因子：
--
通讯作者：
CALARESU, FR
中科院分区：
文献类型：
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作者：
CHESS, GF;TAM, RMK;CALARESU, FR
本文用频谱分析法研究了13只去脑猫在不同的心脏神经输入条件下的心动周期变化。完整动物的谱密度图显示三个明确的峰：P1（1.5-2.5个循环/分钟）、P2（6-10个循环/分钟）和P2（呼吸频率）。在交感神经输入的存在下，只有所有的峰的振幅降低;当只有迷走神经输入时，P1和P2的振幅增加，P3没有变化;当既不存在交感神经也不存在迷走神经输入时，所有的峰的振幅降低。此外，P1和P2的振幅增加，P3没有变化;当交感神经和迷走神经输入都不存在时，所有峰的振幅都降低。此外，在仅迷走神经控制的条件下，P1和P2的振幅与平均心动周期显著相关。结论：P3与窦性心律失常有关，P1和P2可能与自发节律有关，自发节律是迷走神经系统对心动周期动态调节的内在特征。交感神经活动在这些节律的发生中不起作用。
Spectral analysis was used to investigate variations of heart period in 13 decerebrate cats under different conditions of neural input to the heart. Spectral density plots in intact animals showed three well-defined peaks: P1 (1.5-2.5 cycles/min), P2 (6-10 cycles/min), and P2 (respiratory frequency). In the presence of sympathetic input only the amplitudes of all peaks were decreased; when only vagal input was present the amplitudes of P1 and P2 were increased and there was no change in P3; when neither sympathetic nor vagal input was present the amplitudes of all peaks were decreased. In addition, the amplitudes of P1 and P2 were increased and there was no change in P3; when neither sympathetic nor vagal input was present the amplitudes of all peaks were decreased. In addition, the amplitudes of P1 and P2 were found to be significantly correlated with the mean heart period under the condition of vagal control only. It is concluded that P3 is related to sinus arrhythmia and that P1 and P2 may be related to spontaneous rhythms that are an intrinsic feature of the dynamic regulation of heart period by the vagus system. Sympathetic activity plays no role in the genesis of these rhythms.