• Journal of Korean Biological Nursing Science
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• v.13 no.2
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• pp.102-108
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• 2011

Purpose: The purpose of this study was to examine the effects of first clinical training on stress, anxiety and changes in autonomic nervous system in nursing students. Methods: Seventy-four nursing students were assigned to the experimental group (n=36) that had two weeks of clinical training, and the control group (n=38) that had only two weeks of regular classes. Perceived stress, state anxiety and heart rate variability (HRV) were measured at the beginning and end of the experiment. Results: Perceived stress in the experimental group was significantly higher than in the control group. However, State anxiety was not significantly different between the two groups. All indices of HRV except LF/HF ratio were significantly different between the two groups. LF norm in the experimental group was significantly higher than in the control group, and HF norm in the experimental group was significantly lower than in the control group. Conclusion: Based on these results, it can be suggested that clinical training increases the perceived stress and affects the changes in autonomic nervous system in nursing students.

• The Transactions of the Korean Institute of Electrical Engineers P
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• v.62 no.2
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• pp.103-109
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• 2013

In this study, the three sounds effects on subjects due to EEG type, and it researched to find optimal sound to increase their amenity and productivity. EEG and HRV were compared and analyzed in the environmental test room by classifying subjects into two type: A and B. The condition of the environmental test room was in temperature $31[^{\circ}C]$, relative humidity 50[RH%], air current speed 0.02[m/s] and illuminance 1000[lux] with setting up three different sounds which are U type sound, V type sound and Z type sound. The result of this study, at U type sound for A and B type, relative $M{\alpha}$ wave, relative $M{\beta}$ wave and SEF50 were revitalized. Also at Z type sound for A and B type, stress index, fatigue degree and HRT were decreased and SDNN was revitalized. Therefore U type sound is very effective to increase amenity, productivity and concentration, and Z type sound is very effective to decrease stress and fatigue degree.

• Korean Journal of Psychosomatic Medicine
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• v.14 no.1
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• pp.33-38
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• 2006

Biofeedback training to increase the amplitude of respiratory sinus arrhythmia(RSA) maximally increases the amplitude of heart rate variability(HRV) only in respiratory rate at approximately 0.1Hz. To perform this task, people slow their breathing to this rate to point where resonance occur between respiratory sinus arrhythmia(RSA) and oscillation that naturally occur at this rate, probably triggered in part by baroreflex activity. The biofeedback technique allows each individual to breathe at a rate that is specifically adapted to the rhythms of his or her own body. A manual is presented for carrying out this method.

• International Journal of Vascular Biomedical Engineering
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• v.3 no.1
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• pp.14-22
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• 2005

In the present study, our aim is to investigate whether responses to the head-up tilt (HUT) on nonlinear properties of heart rate variability (HRV) in young and elderly subjects are different or not. Thirteen young-healthy subjects ($24.5{\pm}3.7$ years) and 18 old-aged healthy subjects ($74.5{\pm}7.4$ years) participated in this study. An electrocardiogram (ECG) in the supine posture, at $0^{\circ}$, and in the standing posture, at $70^{\circ}$ of head-up tilt, was recorded. Detrended fluctuation analysis (DFA) and approximate entropy (ApEn), measures of short-/long-term correlation properties and overall complexity of heart rate (HR) respectively, along with spectral components of HR variability (HRV) were analyzed for both the supine and HUT postures. We observed that the short-term fractal exponent ${\alpha}_1$ increased during HUT posture (F(1, 29) = 39.79, P = 0.000), especially, the young subjects showed a significantly higher values compared to the elderly subjects. ApEn significantly decreased (F(1, 29) = 8.61, P = 0.006) during HUT posture. HUT posture decreased the complexity in HR dynamics and increased short-term fractal exponent values in young subjects but not in elderly subjects. These results imply that there are differences of response to HUT on nonlinear properties between young and elderly subjects.

• Journal of the Korea Institute of Military Science and Technology
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• v.18 no.6
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• pp.789-796
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• 2015

Fighter pilot's ability to maintain both mental and physical capabilities in highly stressful situations is important for aviation safety as well as mission performance because pilot may confront frequently unexpected physical and psychological stimulation. Cumulative psychological stress and physical fatigue can be causes of mood distortion, declined alertness, and can lead to reduction of combat capability. We have investigated bio-signals and performance tests to monitor stress and fatigue levels, and developed a system to evaluate aviation mission suitability before flight. This study elucidated that stress and fatigue level of pilot can be monitored by psychomotor cognitive test(PCT) and heart rate variability(HRV), and that the best of reference for aviation mission suitability was confidential interval obtained from cumulative data of individuals. The system to evaluate aviation mission suitability was constructed with measuring part with PCT and HRV and control part with DB and algorithm.

• Journal of Oriental Neuropsychiatry
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• v.23 no.1
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• pp.49-58
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• 2012

Objectives : The purpose of this research is to investigate the effects of acupuncture on the anxiety symptoms regarding Hwa-Byung. Methods : Acupuncture was applied on 15 participants, 4 males and 11 females. Hwa-Byung was diagnosed by Hwa-Byung Diagnostic Interview Schedule(HBDIS). Then clinical research STAI, BDI, VAS, HRV was carried out for investigation to analyze the change of each symptom between pre-acupuncture and post-acupuncture. Results : STAI, VAS were all significantly decreased. BDI decreased, but the decrease was not significant. All physical and psychological scores of HBDIS were significantly decreased excluding A2, B2, B3, B5, C1, C5. Subjects of HRV were different between pre-acupuncture and post-acupuncture, but the difference was not significant. Conclusions : The results suggest that acupuncture has positive effects on anxiety and other symptom of Hwa-Byung.

• Journal of Oriental Neuropsychiatry
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• v.29 no.3
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• pp.197-206
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• 2018

Objectives: Conversion disorder is combination of clinical symptoms and can be promoted until diagnosis is confirmed. In this case, we used Korean medical psychotherapy, M&L therapy, and Korean traditional medicine for treating a conversion disorder patient. Methods: The patient was diagnosed with conversion disorder, and main complaints were lower limb dysesthesia, and anxiety. We used BAI, BDI, HRV, CSEI-S, MMPI, Drawing room of mind for assessment. We treated the patient with Korean medical psychotherapy with M&L therapy, and Korean traditional medicine including acupuncture, moxa and herbal medicine. Results: After treatment, clinical symptoms improved to 40% compared with first visit and the BAI, BDI, HRV, CSEI-S scores decreased, especially scores for anxiety and depression. Conclusions: Korean medical psychotherapy and M&L psychotherapy can be effective for treating conversion disorder.

• Journal of Haehwa Medicine
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• v.13 no.1
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• pp.39-45
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• 2004

The study sample consisted of 40 people who were complaining of current insomnia. The study groups were classified according to their age and gender, each containing 5 males and 5 females in the same age group. All the subjects were measured for heart rate (HR) and complicated degree. 1. In the 20's age group, the complicated degree of the female subjects is found to be much less than that of the males, suggesting that the pathology of insomnia would be more serious in the young females. 2. In the 30's age group, the complicated degree of both genders are decreased but there is no significant discrepancy between the reduced complicated degree. 3. In the 40's age group, the complicated degree of both genders are decreased but there is no significant discrepancy between the reduced complicated degree. 4. In the 50's age group, the complicated degree of both genders are decreased, however the females with postmenopausal conditions show much more reduction in the complicated degree, compared to the male group.

• Journal of the Ergonomics Society of Korea
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• v.29 no.1
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• pp.83-91
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• 2010

Recently study on passenger' activities found that many passengers were ride in kinds of transport, e.g. car and railway while business trip. Usually choice of transport is determined by the transportation of passengers, depending on the purpose of travel. A study was therefore set up to study how efficient influence the transports about business trip. The study involved 4 subjects (4m) which divided into four groups during two day. We evaluate about the transport productivity by each day by using the car and railway. The transport productivity of car and railway was valued in HRV and Stroop Color Word Interference Test. The results showed significant differences between the car and railway. The subjects reported that use of railway is greater transport productivity than the car.

• Journal of Korean Society of Industrial and Systems Engineering
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• v.32 no.1
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• pp.67-71
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• 2009

Using driving simulator, we analyzed the driving behavior of an older driver on intersection and measured the pychological load to HRV. As a results, older drivers started to enter the more complex intersection on a great distance and on low velocity for safety driving. On the other hand, the value of HRV would be lower on more complex intersections. It suggested that an older driver allowed for his own losses of physiological and cognitive function and recognized low level of driving confidence relatively.