• The Transactions of the Korean Institute of Electrical Engineers P
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• v.62 no.1
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• pp.50-55
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• 2013

Subjects with 0.7[clo]'s amount of clothing were estimated on their thermal comfort, concentrativeness, heart rate variability, stress and fatigue degree when given variation in relative humidity to 30, 40, 50, 60, 70, and 80[RH%], in an environmental test room of temperature 25[$^{\circ}C$], illumination 1000[lux] and air velocity 0.02[m/sec], by using EEG, learning ability and HRV. At the result, it was at 50~60[RH%] of relative humidity that subject's thermal comfort and concentrativeness were at the highest while stress were at the lowest, and it was at 60[RH%] of relative humidity that heart rate variability was most stabilized. It was found that when temperature and humidity of the environmental test room are at 25[$^{\circ}C$] and 50~60[RH%], subject's productivity and psychological state are least affected.

• Journal of Magnetics
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• v.17 no.2
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• pp.133-137
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• 2012

We investigated the effects of pulsed magnetic fields (PMF) stimulus on electroencephalogram (EEG) alpha activity and heart rate variability (HRV) from electrocardiogram (ECG) measurements with various stimulus durations at acupoint PC9. The alpha activity in the EEG and the ratio of low frequency power and high frequency power (LHR) in the HRV, a reflection of sympathovagal activity, were increased and decreased, respectively, after PMF stimulus of 3 min. Our spectral analysis quantitatively proved that the changes in the EEG alpha activity were consistent with an autonomic function in the ECG. These findings suggest that appropriate PMF stimulus results in the same effect as that of acupuncture applied to the acupoint PC9, which is closely related to the parasympathetic activity of the autonomic nervous system.

• Journal of Korean Society of Industrial and Systems Engineering
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• v.22 no.52
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• pp.203-210
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• 1999

We report on some of the preliminary results of the physiological responses resulting from vehicular speed changes. Healthy human subjects (n=5) were studied for the experiments. We measured the physiological responses of the subjects such as Heart Rate Variability (HRV), Galvanic Skin Response (GSR), and skin temperature for day and night vehicular speed change experiments, respectively. Before and after the tasks, we carried out a self-report for acquiring correlation with experiment results. Mean heart rate variability (HRV) and amplitude of GSR and skin temperature were calculated for 3 minutes duration in each state. The analysis of the physiological measures of ANS activity revealed that vehicle speed change-based affective state evoked arousal response pattern featured by HR acceleration, decrease of skin temperature, and increase of GSR amplitude. The obtained results show that despite some differences observed between each state, overall physiological responses show that the activity of the sympathetic nervous system increases as a result of the increase of speed.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2001.11b
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• pp.699-702
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• 2001

본 연구에서는 생활공간에서의 음 환경이 인체에 미치는 영향을 조사하기 위하여 긍정감성 유발 음환경으로서 시냇물 흐르는 소리를 배경으로한 명상음악을 제시하고 부정감성을 유발하는 음환경으로서 '헬리콥터소음'과 '마루삐그덕 소음'을 제시하여 자율신경계 생리반응으로서 심전도의 HRV를 분석하였다. HRV는 AR(autoregressive) 모델로 구하였으며 Power spectrum을 LF(0.01 - 0.08 Hz), MF(0.08 - 0.15 Hz), HF(0.15 - 0.5 Hz) 영역으로 나누어 LF. MF. HF 영역의 Power 및 LF/HF와 MF/(LF+HF) Power Ratio를 분석하였다.

• Korean Journal of Psychosomatic Medicine
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• v.30 no.1
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• pp.7-15
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• 2022

Objectives : The purpose of this study is to identify the effect of office workers' stress level and stress vulnerability on heart rate variability (HRV), confirm the significance of objective stress indicators obtained through subjective stress and heart rate variability devices, and examine their effectiveness as an integrated stress measurement tool in community mental health projects. Methods : From June to July in 2020, 929 workers participated in the stress management and mental health promotion project carried out by K hospital, and their recorded database was used for study analysis with their agreements. Multiple linear regression analysis was performed to find out the effects of general stress level, and stress vulnerability on heart rate variability. Results : All general characteristics were found to have a significant effect on SDNN (ln), RMSSD (ln), LF (ln), and HF (ln), but work experience did not significantly affect RMSSD (ln). Stress level and stress vulnerability did not significantly affect heart rate variability, but stress perception, a sub-factor of stress level, was found to have a significant effect on RMSSD (ln) (β=0.118, p=0.023). Conclusions : In this study, stress perception, a sub-factor of stress level, was found to be a factor affecting RMSSD (ln). This indicates an association with the activity of parasympathetic nerves in stressful situations, and more follow-up studies are needed to use it as a direct indicator of chronic stress and integrated stress in the community mental health field.

• The Journal of the Society of Korean Medicine Diagnostics
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• v.9 no.2
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• pp.94-109
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• 2005

Objectives: This paper investigated the effects of 8 Constitution Acupuncture on Heart Rate Variability(HRV) and is intended to find out 8 Constitutional difference on Autonomous Function after 8 Constitution Acupuncture stimulation. Methods: The subjects were comprised of 42 volunteers(11 men and 31 women). The volunteers had acupunctured by 8 Constitution Acupuncture Therapy. HRV and Mean Heart Rate(MHR) were measured by TAS9v2.0(IEMBIO & Saerom, Korea) on two times: before and immediately after acupuncture stimulation. The SPSS 13.0 for windows was used for statistical analysis: Mann-Whitney U-test, Paired Samples T -test and Wilcoxon signed rank test were used to verify the results. Results: 1. There was no statistically significant difference on HRV and MHR between Sympathicotonia and Vagotonia before acupuncture. 2. In the whole subject, immediately after acupuncture stimulation, MHR showed a significant decrease(p<0.01) and Ln(TP), Ln(LF) and Ln(HF) showed a significant increase(p<0.05). But there was no significant difference in LHR. 3. Immediately after acupuncture stimulation, MHR showed a significant decrease and Ln(TP), Ln(HF), showed a significant increase in Pulmotonia(p<0.05), Ln(TP) showed a significant increase in Pancretonia(p<0.05),MHR showed a significant decrease and Ln(TP) showed a significant increase in Hepatonia(p<0.05), and MHR showed a significant decrease and Ln(TP), Ln(HF), showed a significant increase in cholecystonia(p<0.05). But there were no significant difference on HRV and MHR in Colonotonia and vesicotonia. Conclusion: The results suggest that 8 Constitution Acupuncture is associated with changed activity in sympathetic and parasympathetic nervous system. Further study is needed for investigating the effects of 8 Constitution Acupuncture on HRV and autonomic nervous system.

• Korean Journal of Psychosomatic Medicine
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• v.19 no.2
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• pp.74-82
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• 2011

Objective:The aim of this study was to evaluate the relationship between sustained attention deficits in Attention-Deficit/Hyperactivity Disorder(ADHD) children and short-term Heart Rate Variability(HRV) parameters. In addition, we evaluate the relationship between The ADHD rating scale(ARS), the computerized ADHD diagnostic system(ADS) and Parenting stress index- short form(PSI-SF). Methods:This study was performed in the department of children and Adolescent psychiatry, Korea university Guro hospital from august 2008 to January 2009. We evaluated HRV parameters by short-term recordings of 5 minutes. K-ARS and ADS are used for screening and identifying ADHD children. Intelligence was measured using Korean educational Developmental Institute-wechsler Intelligence Scale for Children. The caregivers Complete Parenting Stress Index scale for evaluation parent stress. Results:The low frequency(LF) was significantly correlated with response variability of ADS. However, the other variables of ARS and ADS were not significantly correlated with LF. Hyperactivity subscale of ARS was significantly correlated with parental distress subscale and difficult child subscale of PSI-SF and inattention subscale of ARS was also significantly correlated with dysfunctional interaction and difficult child subscale of PSI-SF. Conclusion:The LF, 0.10-Hz component of HRV is known to measure effort allocation. This study shows that the LF component of HRV is significantly correlated with the response variability of ADS. This means that more severe symptoms of ADHD were correlated with the increase in the LF that means decreased effort allocation. These results also support the clinical usability of HRV in the assessment of ADHD. Furthermore, PSI-SF is correlated with hyperactivity and inattention variables of ARS.

• Proceedings of the KSRS Conference
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• v.2
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• pp.868-871
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• 2006

Mortality of domestic people from cardiovascular disease ranked second, which followed that of from cancer last year. Therefore, it is very important and urgent to enhance the reliability of medical examination and treatment for cardiovascular disease. Heart Rate Variability (HRV) is the most commonly used noninvasive methods to evaluate autonomic regulation of heart rate and conditions of a human heart. In this paper, our aim is to extract a quantitative measure for HRV to enhance the reliability of medical examination for cardiovascular disease, and then develop a prediction method for extracting multi-parametric features by analyzing HRV from ECG. In this study, we propose a hybrid Bayesian classifier called FP-based Bayesian. The proposed classifier use frequent patterns for building Bayesian model. Since the volume of patterns produced can be large, we offer a rule cohesion measure that allows a strong push of pruning patterns in the pattern-generating process. We conduct an experiment for the FP-based Bayesian classifier, which utilizes multiple rules and pruning, and biased confidence (or cohesion measure) and dataset consisting of 670 participants distributed into two groups, namely normal and patients with coronary artery disease.

• The Journal of Korean Medicine
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• v.29 no.1
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• pp.134-145
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• 2008

Objectives : This study investigated the relationship between drinking, smoking and stress of workers by analyzing heart rate variability. The subjects were workers in the automobile manufacturing industry. Methods : The subjects consisted of 21,239 and 19,999 industrial workers who had received health examination by Korean oriental medicine and submitted questionnaires about drinking history and smoking history, during 8 months from April to November. The subjects were categorized into drinking history and smoking history. The heart rate variability was measured for five minute at rest using SA-3000P (Medicore) and reported stress severity as stress index, stress resistance and fatigue. We analyzed the relationship between drinking, smoking and stress into frequencies, $x^2$-test using the SPSS Ver. 12.0. Results : Regarding the relationship between drinking and stress index orstress resistance, there was no statistically significant difference, but regarding the relationship between drinking and fatigue, the drinker group had a significantly higher level of fatigue than the non-drinker group. There was a statistically significant difference in stress index, stress resistance and fatigue between the current-smoker group and others. Stress resistance of the current-smoker group had lower levels than the non-smoker group or ex-smokers. On the other hand, stress index and fatigue of the current-smoker group had higher levels than the non-smoker group or ex-smokers. Conclusions : The above results revealed that drinking and smoking could put workers under a lot of stress. Smoking workers were especially apt to be under stress and had difficulty in alleviating stress.

• Journal of Physiology & Pathology in Korean Medicine
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• v.20 no.1
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• pp.115-124
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• 2006

The purpose of this study is to investigate the relationships between the biological base of coping strategy and the different constitutions. First of all, subjects were divided in to 3 groups dy Questionnaire for the Sasang Constitution Classification II and Yin-Yang Property Analysis. Then each group was assigned into two experimental coping conditions, active and passive condition, in turn. The SDNN(The Standard Deviation of the NN Intervals) of HRV(Heart rate variability) index was estimated from two conditions after giving a aversive pain stimulus. The results of the study were as follows 1. The interaction between constitution and coping condition is significant(p<0.05). 2. The SDNNs of Shaoyangren are higher than those of Taiyinren under passive condition but it was opposite under active condition(p<0.05). 3. The main effect of constitution is also significant but that of coping condition is not significant. 4. Thee Shaoyangren is higher than Shaoyinren in multiple comparisons(p<0.05). 5. The interaction between Yin-Yang constitution and coping condition is significant and the main effect of only constitution is significant(p<0.05). According to these results, different constitution can respond differently to coping condition and It is highly related to biological mechanism associated with two basic coping strategies.