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首页> 外文期刊>American Journal of Physiology >The activity of a single muscle sympathetic vasoconstrictor nerve unit is affected by physiological stress in humans.
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The activity of a single muscle sympathetic vasoconstrictor nerve unit is affected by physiological stress in humans.

机译：单个肌肉交感性血管收缩神经单位的活动受人类生理压力的影响。

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摘要

Recording of neural firing from single-unit muscle sympathetic nerve activity (MSNA) is a new strategy offering information about the frequency of pure sympathetic firing. However, it is uncertain whether and when single-unit MSNA would be more useful than multiunit MSNA for analysis of various physiological stresses in humans. In 15 healthy subjects, we measured single-unit and multiunit MSNA before and during handgrip exercise at 30% of maximum voluntary contraction for 3 min and during the Valsalva maneuver at 40 mmHg expiratory pressure for 15 s. Shapes of individual single-unit MSNA were proved to be consistent and suitable for further evaluation. Single-unit and multiunit MSNA exhibited similar responses during handgrip exercise. However, acceleration of neural firing determined from single-unit MSNA became steeper than multiunit MSNA during the Valsalva maneuver. During the Valsalva maneuver, unlike handgrip exercise, the distribution of multiunit burst between 0, 1, 2, 3, and 4 spikes was significantly shifted toward multiple spikes within a given burst (P < 0.05). These results indicated that evaluation of single-unit MSNA could provide more detailed and accurate information concerning the role and responses of neuronal discharges induced by various physiological stresses in humans, especially amid intense sympathetic activity.
机译：记录来自单单位肌肉交感神经活动（MSNA）的神经放电是一种提供有关纯交感神经放电频率信息的新策略。但是，尚不确定在何时以及何时使用单单位MSNA比多单位MSNA更有效地分析人类的各种生理压力。在15名健康受试者中，我们在握力锻炼之前和期间以最大自愿收缩的30％进行了3分钟，以及在Valsalva动作中以40 mmHg的呼气压力测量了15 s时的单单位和多单位MSNA。单个单个MSNA的形状被证明是一致的，适合进一步评估。单单元和多单元MSNA在握力锻炼过程中表现出相似的响应。但是，在瓦尔萨尔瓦（Valsalva）演习中，由单单位MSNA确定的神经放电加速比多单位MSNA陡峭。在瓦尔萨尔瓦（Valsalva）操纵过程中，与手握练习不同，在给定脉冲内，多单位脉冲在0、1、2、3和4个峰值之间的分布明显向多个峰值移动（P <0.05）。这些结果表明，对单个单位MSNA的评估可以提供有关由各种生理压力在人中引起的神经元放电的作用和响应的更详细和准确的信息，特别是在强烈的交感神经活动中。

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