COMPONENTS OF HEART-RATE REACTIVITY DURING MENTAL ARITHMETIC WITH AND WITHOUT SPEAKING
COMPONENTS OF HEART-RATE REACTIVITY DURING MENTAL ARITHMETIC WITH AND WITHOUT SPEAKING
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DOI：
10.1016/0031-9384(91)90434-p
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发表时间：
1991-11-01
影响因子：
2.9
通讯作者：
MYERS, MM
中科院分区：
文献类型：
--
作者：
SLOAN, RP;KORTEN, JB;MYERS, MM
对心理压力的反应被认为与心血管疾病的发展有关。 由于心算（MA）已被证明会显著增加心率和血压，因此它是最常用的实验室心理应激源之一。 然而，使用MA来评估血流动力学反应性引起了两个问题：1）心率的增加可以由迷走神经撤回、交感神经激活或两者的组合产生，并且这些机制在它们的致病含义上可能不同; 2）在大多数MA研究中，受试者被指示大声执行任务，因此增加了说话可能干扰呼吸模式的可能性，这又可能影响血液动力学结果。 为了解决这两个问题，我们研究了10名受试者的心率反应，以2种不同版本的MA和控制条件，其中发声的答案被操纵。 测量心率（HR）、低频（LB）和呼吸频率（RSA）频段的心率变异性（HRV）以及呼吸频率。 结果表明，虽然两个任务条件下产生类似的心率增加，RSA下降，只有在不说话的条件。 总的来说，研究结果表明，在MA的HR变化是由于迷走神经退缩，但在任务过程中发声的答案干扰HRV的分析，从而掩盖了这些变化的机制。
Reactivity to psychological stressors has been hypothesized to be related to the development of cardiovascular disease. Because mental arithmetic (MA) has been shown to produce significant increases in heart rate and blood pressure, it is one of the most commonly utilized laboratory psychological stressors. However, the use of MA to assess hemodynamic reactivity raises two issues: 1) increases in heart rate can be produced by vagal withdrawal, sympathetic activation, or a combination of the two, and these mechanisms may differ in their pathogenic implications; and 2) in most MA studies, subjects are instructed to perform the task aloud, thus raising the possibility that speaking may interfere with respiratory patterns which in turn can influence hemodynamic outcomes. To address these two issues, we studied heart rate responses of 10 subjects to 2 different versions of MA and a control condition in which vocalization of answers was manipulated. Heart rate (HR), heart rate variability (HRV) in the low frequency (LB) and respiratory frequency (RSA) bands, and respiratory rate were measured. Results indicate that, although the two task conditions produced similar heart rate increases, RSA decreased only in the nonspeaking condition. Overall, the findings suggest that HR changes during MA are attributable to vagal withdrawal but that vocalization of answers during the task interferes with analysis of HRV, thus obscuring the mechanisms responsible for these changes.