Effects of mental and physical demands on heart rate variability during computer work
Effects of mental and physical demands on heart rate variability during computer work
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DOI：
10.1007/s00421-002-0656-7
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发表时间：
2002-08-01
影响因子：
3
通讯作者：
Jensen, BR
中科院分区：
文献类型：
--
作者：
Garde, AH;Laursen, B;Jensen, BR
该研究的目的是评估身体和精神需求对心率变异性（HRV）衍生的自主活动指数的影响。十名健康的女性受试者执行两项计算机任务：一项涉及精神和身体需求，另一项主要由身体需求组成的参考任务。该组合任务使用键盘执行一次，使用计算机鼠标执行一次，是颜色词冲突任务 (CWT) 的计算机化版本。由于单词刺激和颜色刺激之间固有的感知冲突，CWT 对心理要求很高。在参考任务（REF）中，体力要求与 CWT 相当，而精神要求较低。最后，受试者在工作场所休息（REST）。获得了有关表现、心率 (HR)、平均动脉血压 (MAP)、HRV 和尿儿茶酚胺浓度的数据。 HRV 应用以下频段：极低频（VLF，0.00-0.04 Hz）、低频（LF，0.05-0.15 Hz）、高频（HE，0.16-0.40 Hz）和总功率（TP，0.00-0.40 Hz）。交感神经活动 (I-SNS) 和副交感神经活动 (I-PNS) 的指数被估计为 LF 和 HF 频段的归一化功率：I-SNS = LF/(TP-VLF) 和 I-PNS=HF/(TP-VLF)。值以标准化单位 (nu) 表示。与 REST [0.397 (0.047) nu] 相比，CWT [鼠标：0.490 (0.052) nu [ave (SEM)] 和键盘：0.476 (0.039) nu] 和 REF [鼠标：0.453 (0.059) nu 和键盘：0.489 (0.047) nu] 期间 ISNS 有所增加，但 CWT 之间没有差异和参考文献。 IPNS 也观察到相应的下降。与 REST 相比，CWT 期间的 HR 和 MAP 较高。没有观察到儿茶酚胺的排泄量受到影响。 I-SNS 和 I-PNS 的计算机鼠标和键盘条件没有差异。总之，在应对体力要求较高的参考计算机任务时，发现 I-SNS 增加和 I-PNS 减少。添加精神需求并没有对 I-SNS 和 I-PNS 产生任何进一步的影响，这表明在计算机工作期间，身体需求而不是精神需求的影响更大。
The aim of the study was to evaluate the effect of physical and mental demands on heart rate variability- (HRV-) derived indices of autonomic activity. Ten healthy, female subjects performed two computer tasks: one with combined mental and physical demands and a reference task primarily consisting of physical demands. The combined task, which was performed once with a keyboard and once with a computer mouse, was a computerized version of the colour word conflict task (CWT). The CWT is highly mentally demanding due to the inherent perceptual conflict between a word stimulus and a colour stimulus. In the reference task (REF) the physical demands were comparable to CWT, while the mental demands were low. Finally, the subjects rested at the workplace (REST). Data on performance, heart rate (HR), mean arterial blood pressure (MAP), HRV, and urinary concentrations of catecholamines were obtained. The following frequency bands were applied for HRV: very low frequency (VLF, 0.00-0.04 Hz), low frequency (LF, 0.05-0.15 Hz), high frequency (HE, 0.16-0.40 Hz) and total power (TP, 0.00-0.40 Hz). Indices of sympathetic nervous activity (I-SNS) and parasympathetic nervous activity (I-PNS) were estimated as normalized powers in LF and HF bands: I-SNS = LF/(TP-VLF) and I-PNS=HF/(TP-VLF). Values are expressed as normalised units (nu). There was an increase in ISNS during CWT [mouse: 0.490 (0.052) nu [ave (SEM)] and keyboard: 0.476 (0.039) nu] and REF [mouse: 0.453 (0.059) nu and keyboard: 0.489 (0.047) nu] compared to REST [0.397 (0.047) nu], but no difference between CWT and REF. Corresponding decreases were observed for IPNS. HR and MAP were higher during CWT compared to REST. No effects were observed for excreted amounts of catecholamines. There were no differences between the computer mouse and the keyboard condition for I-SNS and I-PNS. In conclusion, an increase in I-SNS and a decrease in I-PNS were found in response to a physically demanding reference computer task. Addition of mental demands did not elicit any further effect on I-SNS and I-PNS, suggesting a significant influence of the physical rather than the mental demands during computer work.