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首页> 外文期刊>American Journal of Physiology >Respiratory modulation of human autonomic rhythms.
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Respiratory modulation of human autonomic rhythms.

机译：人体自主节奏的呼吸调节。

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摘要

We studied the influence of three types of breathing [spontaneous, frequency controlled (0.25 Hz), and hyperventilation with 100% oxygen] and apnea on R-R interval, photoplethysmographic arterial pressure, and muscle sympathetic rhythms in nine healthy young adults. We integrated fast Fourier transform power spectra over low (0.05-0.15 Hz) and respiratory (0.15-0.3 Hz) frequencies; estimated vagal baroreceptor-cardiac reflex gain at low frequencies with cross-spectral techniques; and used partial coherence analysis to remove the influence of breathing from the R-R interval, systolic pressure, and muscle sympathetic nerve spectra. Coherence among signals varied as functions of both frequency and time. Partialization abolished the coherence among these signals at respiratory but not at low frequencies. The mode of breathing did not influence low-frequency oscillations, and they persisted during apnea. Our study documents the independence of low-frequency rhythms from respiratory activity and suggests that the close correlations that may exist among arterial pressures, R-R intervals, and muscle sympathetic nerve activity at respiratory frequencies result from the influence of respiration on these measures rather than from arterial baroreflex physiology. Most importantly, our results indicate that correlations among autonomic and hemodynamic rhythms vary over time and frequency, and, thus, are facultative rather than fixed.
机译：我们研究了九种健康年轻人的三种呼吸类型[自发，频率控制（0.25 Hz）和100％氧气过度换气]和呼吸暂停对R-R间隔，光电容积描记动脉压和肌肉交感性节律的影响。我们整合了低频（0.05-0.15 Hz）和呼吸频率（0.15-0.3 Hz）的快速傅里叶变换功率谱;使用互谱技术估算低频下的迷走神经压力感受器-心脏反射增益;并使用部分相干分析从R-R间隔，收缩压和肌肉交感神经光谱中消除呼吸的影响。信号之间的相干性随频率和时间而变化。局部化消除了这些信号在呼吸时的相干性，但在低频时却没有。呼吸方式不影响低频振荡，并且在呼吸暂停期间持续存在。我们的研究记录了低频节律与呼吸活动的独立性，并表明在呼吸频率下动脉压，RR间隔和肌肉交感神经活动之间可能存在紧密的相关性，是由于呼吸对这些措施的影响而不是由动脉的影响引起的。压力反射生理。最重要的是，我们的结果表明自主神经节律和血液动力学节律之间的相关性随时间和频率而变化，因此是兼职的，而不是固定的。

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