心率变异性在心理负荷评估中的应用

[Application of heart rate variability in evaluation of mental workload].

作者信息

Wang Zheng-lun, Yang Lei, Ding Jia-shun

机构信息

Department of Environmental and Occupational Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China.

出版信息

Zhonghua Lao Dong Wei Sheng Zhi Ye Bing Za Zhi. 2005 Jun;23(3):182-4.

PMID:16124893

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.

摘要

目的

探讨心率变异性（HRV）是否可用于评估心理负荷。

方法

选取46名志愿者通过键盘输入随机数来模拟心理工作。在工作过程中用动态心电图记录仪Holter 8800记录心电图，并转换为数字信号。用Holter软件分析总功率（TP）、低频（LF）、高频（HF）。

结果

随着时间推移，输入速度增加但准确性降低，且与TP、LF呈正相关（r分别为0.851和0.827，P<0.05），呈现明显的剂量效应关系。静息时的HRV值高于心理工作期间[TP：（2745.4±1301.6）与（686.2±420.7）ms²/Hz；HF：（670.6±393.8）与（202.6±171.7）ms²/Hz；LF：（870.5±553.7）与（206.0±187.9）ms²/Hz]，表明随着心理工作开始，HRV值显著下降。随后，随着工作量（强度和时间）增加，HRV值逐渐升高，但仍处于较低水平。