心率变异性信号的修正IPFM模型

本文提出了一个修正的积分频率调制模型，仿真结果表明：该模型及简化的积分脉冲频率调制模型产生的仿真心率变异性信号均可反映调制信号的节律性变化；但ＭＩＰＦＭ模型产生的仿真ＨＲＶ信号的时域，频域特征均更接近于实际ＨＲＶ信号。     

基于小波逆变换合成的心率变异性信号的IPFM模型

本文提出了心率变异性信号的一种改进的积分脉冲频率调制的计算机仿真模型。由于合理地设计了模型的前置部分，从而使得仿真的ＨＲＶ信号的频谱和调制信号的频谱具有一致性。又由于采用小波逆变换的方法合成了ＨＲＶ信号中的１／ｆ部分，从而使得仿真的ＨＲＶ信号的时特征及频域特征均比原有的ＩＰＦＭ模型更近近于实际的ＨＲＶ信号。     

Prony参数模型法在心率变异性谱分析中的应用

本文用衰减正弦函数的线性组合作为人体心率变异性（ＨＲＶ）的信号模型，在不同体位条件下，用Ｐｒｏｎｙ参数模型法估计了ＨＲＶ信号的能量谱，并分析了模型参数的生理意义。结果表明：Ｐｒｏｎｙ，周期图及自回归（ＡＲ）谱在不同体位条件下具有相似的分布特征。立位时，Ｐｒｏｎｙ谱低频谱峰的频率位置向更低频端移动，相应频率衰减因子的绝对值显著减小（Ｐ＜０．０１），振幅有增大趋势；高频谱峰的频率位置基本不变，相应频率衰减因子的绝对值有增大趋势，振幅显著减低（Ｐ＜０．０５）。考虑到体位改变时心血管系统自主神经均衡性的变化，我们认为，本文提出的ＨＲＶ信号模型是合理的，用Ｐｒｏｎｙ方法分析ＨＲＶ信号不仅可以得到ＨＲＶ信号的能量谱，而且可以根据模型参数定量地反映心血管系统自主神经均衡性的变化。     

EFFECTS OF DEPTH AND RATE OF BREATHING ON HEART RATE AND HEART RATE VARIABILITY

Effects of depth and rate of breathing on heart rate (HR) and HR variability were observed in two experiments. Respiration rate (RR) affected only cardiac stability, faster breathing producing more stable cardiac rate. Respiration depth (RD) affected both HR level and variability. Deep breathing produced faster, more variable HR, while shallow breathing had the opposite effects. A third experiment, in which Ss were trained to control HR using respiration, further illustrated the dramatic effects of respiration on cardiac rate. Implications of these results for experiments utilizing HR as a dependent variable and studies of autonomic control were discussed.     

心率功率谱分析检测植物神经功能状态

本工作在ＡＰＰＬＥ－Ⅱ微机上建立了心率功率谱分析方法，观察了植物神经对心率功率谱各频峰的影响。结果表明：心率功率谱高频峰与迷走神经活动有关，迷走神经紧张性减弱时，高频峰密度降低，心率功率谱低频峰既与迷走神经有关，又与交感神经有关，交感神经紧张性增加时，低频峰密度增加。心率功率谱分析可无创客观定量地检测植物神经功能状态。     

一种适用于心率变异分析的R波检测与定位算法

在心率变异分析中,不仅要可靠地检测出 R 波,而且要对 R 波的峰值点进行准确定位。本文提出一种简单有效的 R 波检测方法,它不仅能够有效地抑制心率变异分析中的基线漂移、工频噪声、肌电、运动伪迹等干扰,提高实时检测 R 波准确率,并且能够对 R 波的峰值点准确定位。由于算法简单,适用于便携式心率变异分析仪。     

MEAN HEART RATE PREDICTED BY TASK DEMAND CHARACTERISTICS

Mean HRs recorded during sequences of perceptual-motor and cognitive tasks were predicted from ratings of task characteristics such as complexity and frequency of stimuli, transformations, and responses. In three separate groups of Ss and tasks the correlations between mean HRs and task demand ratings were ≥.91.     

心率与黄金数的联系

健康成年人的静息平均心率，总是在最高心率的黄金分割数附近的数。（１）在年青时的心率几乎等于黄金数。（２）随年龄的增加，心率跟黄金数的接近程度逐步从靠近到远离的方向变化。（３）从心率的比值和黄金数的偏差程度准确地划分人生的发育期、成熟期、衰老前期及衰老期。     

THE NEONATAL EVOKED HEART RATE RESPONSE AND THE LAW OF INITIAL VALUE

Two-second long square wave tones at frequencies of 125 and 1000 Hz and 75 db sound pressure were presented to six newborn infants. Mean heart rates were computed for the 10 sec prior to and the 10 sec following stimulus onset, i.e. the prestimulus and stimulus heart rate values respectively. LIV was shown to operate strongly only in the case of the 125 Hz stimulus. Even for this stimulus, LIV depended upon the state of the infant, showing an appropriate negative correlation between prestimulus and stimulus values in regular sleep and quiet wakefulness but a slightly positive correlation in irregular sleep. In randomly selected control periods, the first 5 sec served as prestimulus values and the second 5 sec as stimulus values. Regression coefficients for these control periods did not differ significantly from those during which the stimulus was actually present. In view of the special conditions required for its demonstration, the generality of Wilder's “law” seems to be seriously questioned.