The relation between rhythmic cardiovascular variability and reactivity to orthostatic, cognitive, and cold pressor stress.
The relation between rhythmic cardiovascular variability and reactivity to orthostatic, cognitive, and cold pressor stress.
复制标题
节律性心血管变异性与直立性、认知性和冷加压应激的反应性之间的关系。
作者：
J. Hatch;K. Klatt;S. Porges;L. Schroeder;J. Supik
两组血压正常的男性受试者（父母有原发性高血压阳性或阴性病史）暴露于从水平到70°抬头姿势的被动身体倾斜，同时在逐搏的基础上对收缩压和舒张压、心动周期和呼吸振幅进行采样。受试者还进行心算和冷加压任务，心血管反应性表示为较基线水平的变化。通过交叉频谱分析对身体倾斜数据进行分析，重点是两个频带，一个在0.06 - 0.1 Hz之间，另一个在主要呼吸频率。两组在生理活动的基础水平或对任务的反应方面没有显着差异。交叉频谱分析确定倾斜引起的功率谱和相干谱在两个频带内的变化。这些变化在两个频带之间和所研究的各种生理反应系统之间是不同的。较大的节律振荡在心脏周期内的两个频段预测更大的心血管反应心算任务，但不是冷加压任务。结果讨论的神经控制机制（例如，迷走神经张力），其在心理生理状态如应激期间参与心血管功能的动态调节。
Two groups of normotensive, male subjects having either a positive or negative parental history of essential hypertension were exposed to passive body tilt from horizontal to a 70° head-up posture, while systolic and diastolic blood pressure, heart period, and respiration amplitude were sampled on a beat-by-beat basis. Subjects also performed mental arithmetic and cold pressor tasks, and cardiovascular reactivity was expressed as change from baseline levels. The body tilt data were analyzed by cross-spectral analysis focusing on two frequency bands, one between .06-.1 Hz, and the other at the predominant breathing frequency. The two groups did not differ significantly in their basal levels of physiological activity or in their response to the tasks. Cross-spectral analysis identified tilt induced changes in the power spectra and coherence spectra within the two frequency bands. These changes differed between the two frequency bands and among the various physiological response systems investigated. Larger rhythmic oscillations in heart period within both frequency bands predicted greater cardiovascular reactivity to the mental arithmetic task but not the cold pressor task. The results are discussed in terms of neural control mechanisms (e.g., vagal tone) implicated in the dynamic regulation of cardiovascular function during psychophysiological states such as stress.
登录
查看更多内容
影响因子：
56.9
作者：
AKSELROD, S;GORDON, D;COHEN, RJ
通讯作者：
COHEN, RJ
影响心脏迷走神经控制的药理操作对大鼠心率、心率变异性和呼吸的影响。
影响因子：
3.7
作者：
Yongue,BG;McCabe,PM;Porges,SW;Rivera,M;Kelley,SL;Ackles,PK
通讯作者：
Ackles,PK
父母高血压和心血管对认知和等长挑战的反应。
影响因子：
3.7
作者：
Manuck,SB;Proietti,JM
通讯作者：
Proietti,JM
兔主动脉神经刺激期间心脏周期的变化、心脏周期变异性以及呼吸性窦性心律失常的频谱分析估计。
影响因子：
3.7
作者：
McCabe,PM;Yongue,BG;Porges,SW;Ackles,PK
通讯作者：
Ackles,PK
健康年轻人父母高血压和心血管对压力的反应。
影响因子：
3.7
作者：
Hastrup,JL;Light,KC;Obrist,PA
通讯作者：
Obrist,PA