• The Journal of Korean Obstetrics and Gynecology
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• v.20 no.1
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• pp.199-213
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• 2007

Purpose : This research was designed to determine whether HRV can be used as an assessment index in weakly postpartum women. Methods : The subjects were 232 women who admitted for postpartum care in Oriental Hospital of Woosuk University from 19, December 2005 to 21, July 2006. They took the test of CBC and HRV. And then we selected 200 cases of postpartum women. The SPSS 10.0 for windows was used to analyse the data and the simple correlation coefficient and the independent samples t-test were used to verify the results. Results : The following results were obtained : 1. There were positive correlations between items of CBC(RBC, Hb, Hct) and SDSD, RMSSD, SDNN, and also between items of CBC and log-transformed index of spectral analysis. There were negative correlations between items of CBC and Mean-HRV, pNN50. 2. SDNN of anemic postpartum women group significantly decreased compared with that of normal postpartum women group. HRV-Index, RMSSD and SDSD of anemic postpartum women group significantly decreased compared with that of normal postpartum women group. pNN50 of anemic postpartum women group significantly increased compared with that of normal postpartum women group. 3. Ln(TP), Ln(VLF), Ln(LF) and Ln(HF) of anemic postpartum women group significantly decreased compared with that of normal postpartum women group. Conclusion : The results suggest that the function of heart of anemic postpartum women group significantly decreased compared with that of normal postpartum women group.

• The Journal of Korean Obstetrics and Gynecology
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• v.18 no.4
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• pp.136-143
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• 2005

Purpose : This study was performed to find differerces between postmenopausal and premenopausal women on HRV and DITI. Methods : 26 postmenopausal women(mean age${\pm}$SD, 50.96${\pm}$2.75) and 26 premenopausal women (mean age${\pm}$SD, 49.46${\pm}$3.33) were compared with HRV which was conducted in the sitting position for 5 minutes. Temperature of specific acupoints-Indang, Chonjung(CV17), Kwanwon(CV4) was checked using DITI image and obtained ${\Delta}T1$(Chonjung-Kwanwon), ${\Delta}T2$(Indang-Kwanwon), T0(Kwanwon) value in each group. Results : HRV measurements generally decreased in postmenopausal group than premenopausal group but there was no significance. ${\Delta}T1$ increased significantly in postmenopausal group compared with premenopausal group. ${\Delta}T2$ also increased in postmenopausal group but there was no significance. Conclusion : It can be suggested that Chonjung(CV17) can be the useful point to evaluate postmenopausal women by using DITI.

• Journal of Acupuncture Research
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• v.27 no.5
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• pp.51-58
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• 2010

Objectives : The purpose of this study is to assess the effect of laser acupuncture at $HT_7$ for reducing mental stress using power spectrum analysis of the heart rate variability. Methods : 36 healthy volunteers(control group: 18, treatment group: 18) participated in this study. After instrumentation and 5-minute rest period, 5-minute metal stress by operation was provided. HRV was recorded before and after the mental stress(1st, 2nd HRV). After 2nd HRV recording, the control group rested for 15 minutes without any treatments. Participants in the treatment group received laser acupuncture to $HT_7$ unilaterally and rested for 15minutes. Points were irradiated for 60seconds, and the intensity was 1.8J(output 20%). And then 3rd HRV was recorded. Results : In simple rest group, LF norm showed a significant change after mental stress. In laser acupuncture group, LF norm, HF norm, LF, HF and LF/HF ratio showed a significant change after mental stress. But there were no significant difference between two groups(ANCOVA test, p>0.05). In laser acupuncture group, LF norm, HF norm, HF and LF/HF ratio showed a significant change after laser acupuncture treatment. And there were significant differences between two groups(p<0.05). Conclusions : This study suggests that laser acupuncture at $HT_7$ can regulate and prevent the alternation of autonomic nervous system due to mental stress.

• The Journal of Korean Obstetrics and Gynecology
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• v.20 no.3
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• pp.164-177
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• 2007

Purpose: The purpose of this study is to analysis on the Heart Rate Variability(HRV) of some dysmenorrhoea patients. Methods : We studied 30 patients visiting Kyung Hee University East-West Neo Medical Center from 7th Febrary 2007 to 22th Febrary 2007. Women with organic disease were excluded from this study. The severity of dysmenorrhoea were measured by Multidimensional Verbal Rating scale(MVRS), Verbal Rating scale (VRS) and Visual Analog Scale(VAS). And HRV was recorded. Results : According to comparison of Means of HRV values among the groups of None, Mild and Moderate, the points of almost all values were kept by order of Moderate group-Mild group-None group. Among these, the statistically significant things are PR, SDNN, Ln (TP), Ln (VLF), Ln (LF). According to correlation analysis between dysmenorrhoea and HRV, specially, there were many correlations in VRS2. Among these, the statistically significant things are LF norm, HF norm, LF/HF ratio(p<0.05L). Conclusion : The results suggest that HRV is related to dysmenorrhoea. We may analyze that dysmenorrhoea is related to, specially, increased activities of sympathetic nerve. We need more study for settling this.

• Journal of Oriental Medical Thermology
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• v.5 no.1
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• pp.1-13
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• 2006

Objectives : This study was designed to analyze basic data for cold hypersensitivity patients with a questionnaire and investigate correlation between cold hypersensitivity and Heart Rate Variability(HRV). Methods : 49 patients who complain of cold hypersensitivity on hands and feet in ambulatory care were investigated in Oriental Gynecology, Kyunghee Oriental Medical Center and Women medical center, Kangnam Koreana hospital from May 1, 2006 to October 20, 2006. All patients were asked to answer a questionnaire. After careful I examination to rule out other disease which may affect Digital Infrared Thermal Imaging(DITI) and HRV data, patients were taken thermography for the diagnosis of cold hypersensitivity Based on the result of thermography, the patients were divided into two groups(Objective cold hypersensitivity and Subjective cold hypersensitivity). Then, these two groups were compared using HRV data which was measured in the supine position for 5 minutes. Results: 1. For most patients, cold hypersensitivity first developed during puberty. 2. The parts of the body that felt cold first time were hands and feet. 3. The cold sensation was increased in winter or at bedtime Showing that the sensation can be changed according to the level of coldness. 4. Among women who sufferfrom cold hypersensitivity, very few of them were treated. 5. More than half of cold hypersensitivity patients's family member also had a cold hypersensitivity. 6. The decrease in mean values of LF/HF ratio was observed in objective cold hypersensitivity group than subjective cold hypersensitivity group and the decrease was significant(P=0.014) when examined by Student t-test. Conclusions : It is necessary that the cold hypersensitivity patients should be treated carefully considering the facts mentioned above. And it can be suggested that dysautinomia be related with cold hypersensitivity and be evaluated by HRV.

• Journal of the Korean Association of Oral and Maxillofacial Surgeons
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• v.33 no.5
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• pp.485-493
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• 2007

Purpose: Heart rate variability(HRV) is the clinical consequence of various influences of the autonomic nervous system(ANS) on heart beat. HRV can estimate the potential physiologic rhythm from the interval between consecutive beats(RR interval or HRV data). It is known as RSA which represents respiration-related HR rhythmic oscillation. Previous studies demonstrated a specific breathing pattern(0.1Hz, 6breaths/min) to improve a physiological body condition related to the stress. In this paper, the level of stress would be evaluated in terms of three phases of the dental treatment, combined with 6breaths/min. Methods: These phases include before, during and after tooth extraction or anesthesia or something.36 patients' stresses were assessed using HRV stress analyzer in each phase in Kangdong Sacred Heart Hospital, and Chuncheon Sacred Heart Hospital, Hallym University Medical Center from Jun. to Sept. of 2007. HRV 5-min data collected were analyzed in time-domain and frequency-domain to evaluate the activity of autonomic nervous system(ANS) which represents the level of stress. Results: All HRV parameters including HF(high frequency), LF(low frequency) and LF/HF ratio showned a significant change affecting the ANS balance. There was a 6.4% difference between R(LF/HF)s on general breathing pattern for balance of Autonomic nervous system, but on controlled breathing pattern, 0.1Hz, was made narrow till 1.4%. The activity of ANS has increased by 1.4% on general breathing pattern, and by 2.9% on controlled breathing pattern, 0.1Hz. Conclusion: After analysis of preoperative stress changes and effect of breathing pattern of 0.1 Hz on the stress in 36 patients who have undergone third molar extraction, following was concluded. In the preoperative stage, the sympathetic change was the greatest?after the?anesthetic injection, and stress was relieved by controlling the breathing pattern to a frequency of 0.1Hz.

• Journal of Oriental Neuropsychiatry
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• v.19 no.1
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• pp.107-124
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• 2008

We investigated the effects of distilled Astragali Radix Herbal Acupuncture on autonomic nervous system with the Heart Rate Variability(HRV) in adult man. as well as we tried to observe how distilled Astragali Radix Herbal Acupuncture on the balance of the autonomic nervous system. Methods : We investigated on 61 healthy volunteers consisted of 31 subjects in experiment(distilled Astragali Radix Herbal Acupuncture) group and 30 subjects in control(Normal Saline) group. Study form was a randomized, placebo-controlled, double-blind clinical trial. 31 subjects in experiment group were injected distilled Astragali Radix Herbal Acupuncture at GB21(Kyonjong) and 30 subjects in control group were injected Normal Saline at GB21(Kyonjong). except of 2 subjects(in control group) who can't be measured and 10 subjects(6 in experiment group and 4 in control group) who move or make unforceable error during measuring. Finally 25 subject in experiment group and 24 subject in control group are studied. We measured HRV by PolyG-I on 7 times : before and after injection per 5 minutes during 30 minutes. The SPSS 10.0 for windows was used to analyze the data and the paired t test(in group) and Student t test(between two groups) were used to verify the result. Results : I. After distilled Astragali Radix Herbal Acupuncture injection, SDNN is significantly high from 5 minute to 10 minute and from 15 minute to 30 minute, Complexity is significantly low from 20 minute to 30minute. HRV index is significantly mgb for first 20 minute and from 25 minute to 30 minute, RMSSD is significantly high only from 15 minute to 20 minute. 2. HRV index of distilled Astragali Radix Herbal Acupuncture Group significantly increased from 25 minute to 30 minute, pNN50 of distilled Astragali Radix Herbal Acupuncture Group significantly decreased from 25 minute to 30 minute and RMSSD of distilled Astragali Radix Herbal Acupuncture Group significantly increased from 25 minute to 30 minute compared with those of Normal Saline group. 3. After distilled Astragali Radix Herbal Acupuncture injection, Ln(TP) is significantly high from 5 minute to 10 minute and from 15 minute to 30 minute. Ln(VLF) is significantly high after 5 minute, Ln(LF) is significantly high after 15 minute and Ln(HF) is significantly high from 5 minute to 10 minute and 25 minute to 30 minute, but significantly low for first 5 minute and from 10 minute to 20 minute. Normalized LF is significantly high after 20 minute and Normalized LF is significantly low after 20 minute. Conclusions : The results suggest that distilled Astragali Radix Herbal Acupuncture in healthy adult man tend to activate the autonomic nervous system within normal range. This result is derived from that parasympathetic nervous system was continuously activated and sympathetic nervous system was activated a little later.

• Journal of the Korean Applied Science and Technology
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• v.36 no.1
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• pp.142-152
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• 2019

This study aimed to explore the association between obesity index and heart rate variability (HRV) in college-aged male smokers. A total of 85 male college students (> 10 cigarettes per day for at least 3 years) were participated in this study. According to a standardized protocol, body mass index (BMI), percent body fat (%BF), waist circumference (WC), and waist-to-hip ratio (WHR) were taken as obesity indices. Resting r-r interval was monitored for HRV analysis as an indicator of cardiac autonomic regulation. Compared with low WHR subjects, high WHR subjects had significantly lower values of rMSSD, pNN50, HF, and SD1, suggesting decreased parasympathetic activity. No such differences in LF/HF ratio were found between the WHR-based subgroups. Bivariate correlation analysis showed that obesity indices of WC, WHR, and %BF were significantly associated with rMSSD, pNN50, HF, and SD1, with a tendency for correlation coefficient to be higher with WHR than with WC or %BF. No significant association was found between BMI and HRV parameters indicative of parasympathetic activity. This study suggest that central obesity is significantly associated with decrease in parasympathetic activation, independent of BMI as an indicator of obesity, in male college smokers.

• Journal of Korea Society of Industrial Information Systems
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• v.20 no.3
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• pp.11-18
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• 2015

Stress is one of the major causes threatening the mental and physical health of human today. In this paper, we analyzed the heart rate variability(HRV), galvanic skin response(GSR), and skin temperature data measured from the university subjects before and after the class to examine the influence on bio-signal in stress environment. Thirty subjects from university students (aged between 21 and 27 years; mean=22.31, STD=1.45) took part in this study. From the experiment results, RMSSD(p=0.033), LF peak(p=0.003), VLF(p=0.045) were statistically significant from those of the control group(p<0.05) of HRV both in time and frequency domain. We observed that mean skin conductivity after the class(mean=5.993(uS), SD=3.406) is higher than that before the class(mean=3.039(uS), SD=2.628) by 97.2% on average and the skin temperature after the class($34.835{\pm}0.305$) is slightly higher than that before the class($34.471{\pm}0.281$) by 1.055% on average. The results in this research could be used to examine the autonomic response in clinical stress related research.

• Science of Emotion and Sensibility
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• v.22 no.3
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• pp.21-34
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• 2019

This study was an examination of the relevance and clinical significance of electroencephalographic (EEG) indexes (e.g., mental/physical stress and attention) and indexes of heart rate variability (HRV) with regard to cognitive function and physiological health conditions in elderly people. A device was used to record two-channel EEGs of the frontal lobe and a one-channel ECG simultaneously. Subjects were 76 people average aged 73. The significant findings are as follows: First, subjects whose intrinsic alpha rhythm had high amplitude, regardless of peak, showed higher resistance to mental stress and lower physical stress than did subjects with low-amplitutde intrinsic alpha rhythm. Second, HRV, SDNN, and RMSSD indexes showed strong positive correlations between the two groups of subjects regardless of the division of groups. Third, the alpha asymmetry of the left and right sides of the brain in subjects with low-amplitude intrinsic alpha rhythm was larger, and the delta/alpha ratio (reflecting physical stress) and theta/sensorimotor rhythm (SMR) ratio (showing the decline in attention) were bigger. Fourth, the subjects in whom intrinsic alpha rhythm peak occurred during slow rhythm had a higher theta/SMR ratio than did subjects whose peak occurred during fast rhythm, which was related to a steeper decline in attention. Therefore, the presence or absence of intrinsic alpha rhythm peak and amplitude on quantitative EEG may be an index reflecting the cognitive function and physiological health of elderly people.