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The Analysis of Mental Stress using Time-Frequency Analysis of Heart Rate Variability Signal  

Seong Hong Mo (Korea Food&Drug Administration, Pharmaceutical Safety Bureau, Medical Devices Surveilance Division)
Lee Joo Sung (Yonsei University, College of Health Science, Department of Biomedical Engineering)
Kim Wuon Shik (Human Life Measurement Group, Center for Environment & Safety Measurement, Korea Research Institute of Standards and Science)
Lee Hyun Sook (Sangji University, College of Science and Engineering, Department of Computer & Electronic Physics)
Youn Young Ro (Yonsei University, College of Health Science, Department of Biomedical Engineering)
Shin Tae Min (Yonsei University, College of Health Science, Department of Biomedical Engineering)
Publication Information
Journal of Biomedical Engineering Research / v.25, no.6, 2004 , pp. 581-587 More about this Journal
Abstract
Conventional power spectrum methods based on FFT, AR method are not appropriate for analyzing biomedical signals whose spectral characteristics change rapidly. On the other hand, time-frequency analysis has more desirable characteristics of a time-varying spectrum. In this study, we investigated the spectral components of heart rate variability(HRV) in time-frequency domain using time frequency analysis methods. In the various time-frequency kernels functions, we studied the suitable kernels for the analysis of HRV using synthetic HRV signals. First, we evaluated the time/frequency resolution and cross term reduction of various kernel functions. Then, from the instantaneous frequency, obtained from time-frequency distribution, the method extracting frequency components of HRV was proposed. Subjects were 17 healthy young men. A coin-stacking task was used to induce mental stress. For each subjects, the experiment time was 3 minutes. Electrocardiogram, measured during the experiment, was analyzed after converted to HRV signal. In the results, emotional stress of subjects produced an increase in sympathetic activity. Sympathetic activation was responsible for the significant increase in the LF/HF ratio. Subjects were divided into two groups with task ability. Subjects who have higher mental stress have lack of task ability.
Keywords
Time-frequency analysis; Mental stress; Heart rate variability;
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