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心率变异性在脑力负荷评价中的应用
引用本文:王正伦,杨磊,丁嘉顺.心率变异性在脑力负荷评价中的应用[J].中华劳动卫生职业病杂志,2005,23(3):182-184.
作者姓名:王正伦  杨磊  丁嘉顺
作者单位:430030,武汉,华中科技大学同济医学院劳动卫生与环境卫生学系劳动生理与工效学实验室
摘    要:目的探讨用心率变异性(HRV)来评价脑力负荷的可行性。方法受试者在计算机前输入随机数字,模拟脑力劳动。采用Holter8800型动态心电图分析仪连续记录其心电信号,并将心电信号转变为数字信号,应用Holter分析软件分析HRV频域指标:总功率(TP)、低频(LF)、高频(HF)、LFHF。结果输入数字的速度随时间的延长而逐渐增加,输入正确率却逐渐下降。输入速度与HRV的TP和LF呈明显的正相关(r值分别为0.851和0.827,P<0.05),并呈现剂量-反应关系,而HF和LFHF与输入速度之间没有明显相关。休息和脑力劳动开始时HRV各指标的值分别为:TP:(2745.4±1301.6)、(686.2±420.7)ms2Hz;HF:(670.6±393.8)、(202.6±171.7)ms2Hz;LF:(870.5±553.7)、(206.0±187.9)ms2Hz。脑力劳动时HRV各指标与休息时相比,均明显降低,这是一个总的趋势。然后它们在低水平上随着负荷量(强度和时间)的增加而波动且有逐渐升高的趋势。结论心率变异性可以用作脑力劳动负荷的评价指标,但其变化规律有待于进一步的研究。

关 键 词:心率变异性  脑力负荷  Holter分析  剂量-反应关系  LF/HF  脑力劳动  HRV  心电信号  图分析仪  动态心电  数字信号  信号转变  频域指标  软件分析  评价指标  劳动负荷  变化规律  计算机  受试者  总功率  速度  正确率  正相关  负荷量
修稿时间:2004年5月8日

Application of heart rate variability in evaluation of mental workload
WANG Zheng-lun,YANG Lei,DING Jia-shun.Application of heart rate variability in evaluation of mental workload[J].Chinese Journal of Industrial Hygiene and Occupational Diseases,2005,23(3):182-184.
Authors:WANG Zheng-lun  YANG Lei  DING Jia-shun
Institution:Department of Environmental and Occupational Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China.
Abstract:OBJECTIVE: To investigate if heart rate variability (HRV) can be used to evaluate mental workload. METHODS: Forty-six volunteers were selected to simulate mental work by inputting the random number through keyboards. ECG was recorded by Holter 8800 during the performance and transferred into digital signal. Total power (TP), low frequency (LF), high frequency (HF) were analysed by Holter software. RESULTS: Along with time, the inputting speed increased but accuracy decreased, and was positively correlated with TP, LF (r = 0.851 and 0.827 respectively, P < 0.05), showing a distinct dose-effect relationship. HRV values at rest were higher than during mental work TP: (2 745.4 +/- 1 301.6) vs (686.2 +/- 420.7) ms(2)/Hz; HF: (670.6 +/- 393.8) vs (202.6 +/- 171.7) ms(2)/Hz; LF: (870.5 +/- 553.7) vs (206.0 +/- 187.9) ms(2)/Hz] indicating that they were decreased remarkably as the mental work started. Then, they were gradually increased with the workload (intensity and time) increased, but still at lower level. CONCLUSION: HRV may be used as a parameter to evaluate mental workload but the change pattern of HRV needs to study further.
Keywords:Heart  Mental workload  Evaluation studies
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