• 전기학회논문지
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• 제67권6호
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• pp.794-798
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• 2018

There is a growing need for a care system that can continuously monitor, manage and effectively relieve stress for modern people. In recent years, mobile healthcare devices capable of measuring heart rate have become popular, and many stress monitoring techniques using heart rate variability analysis have been actively proposed and commercialized. In addition, respiratory biofeedback methods are used to provide stress relieving services in environments using mobile healthcare devices. In this case, breathing information should be measured well to assess whether the user is doing well in biofeedback training. In this study, we extracted the heart beat interval signal from the PPG and used the oscillator based notch filter based on the IIR band pass filter to track the strongest frequency in the heart beat interval signal. The respiration signal was then estimated by filtering the heart beat interval signal with this frequency as the center frequency. Experimental results showed that the number of breathing could be measured accurately when the subject was guided to take a deep breath. Also, in the timeing measurement of inspiration and expiration, a time delay of about 1 second occurred. It is expected that this will provide a respiratory biofeedback service that can assess whether or not breathing exercise are performed well.

• 센서학회지
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• 제19권1호
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• pp.17-24
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• 2010

This paper describes a real time reliable monitoring method and analysis system using wrist type oximeter for ubiquitous healthcare service based on IEEE 802.15.4 standard. Photoplethysmograph(PPG) is simple and cost effective technique to measure blood volume change. In order to obtain and monitor physiological body signals continuously, a small size and low power consumption wrist type oximeter is designed for the measurement of oxygen saturation of a patient unobtrusively. The measured data is transferred to a central PC or server computer by using wireless sensor nodes in wireless sensor network for storage and analysis purposes. LabVIEW server program is designed to monitor stress indicator from heart rate variability(HRV) and process the measured PPG to accelerated plethysmograph(APG) by appling second order derivatives in server PC. These experimental results demonstrate that APG can precisely describe the features of an individual's PPG and be used as estimation of vascular elasticity for blood circulation.

• 한국산업융합학회 논문집
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• 제23권4_2호
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• pp.593-601
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• 2020

This study was conducted to analyze the physical strain with heart rate monitor in timber harvesting operations in order to reduce occupational accidents. The timber harvesting activities are manual cutting(felling, limbing and bucking) with a chainsaw and extraction by cable yarder. The study took place on Japanese larch stand. The average height was 26m and average diameter at breast height(DBH) was 3 7cm. The havest unit was gentle slope to steep slope. Results showed that the heart rate increases for chocking, felling, limbing and bucking were 94.0%, 87.9%, 84.8% and 56.4% respectively. The rate of Work Load Index was higher in the limbing(61.4%) activity than other activities chocking(55.2%), felling(54.1%) and bucking(32.1%). During 50% working heart rate test it was found that limbing(1.09), chocking(1.05) and felling(1.04) was exposed to high work intensity compared to bucking(0.83). The results showed that maximum acceptable work times(felling, chocking and limbing) were 2.30 hour, 1.85 hour and 1.60 hour respectively. To avoid occupational accidents, timber harvest workers may use a suitable working hour schedule to felling, chocking, limbing.

• Child Health Nursing Research
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• 제6권1호
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• pp.32-50
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• 2000

A descriptive exploratory design was used in this study to evaluate the effects of sponge bathing on physiological(heart rate, heart period, vagal tone, oxygen saturation, respiration) and behavioral responses in newly born 40 preterm infants from intensive care unit of S University Hospital in Seoul. Data has been collected from October, 1997 to March, 1999. The infants were between 27-33 weeks gestational age at birth, and were free of congenital defects. The subjects entered the protocol when they were medically stable (determined by initiation of feeding and discontinuation of all respiratory support) but still receiving neonatal intensive care. The infants' physiologic parameters were recorded a 10 - minute before, during, and after bathing. Continuous heart rate data were recorded on a notebook computer from the infant's EKG monitor. The data were digitized off-line on software(developed by Lee and Chang in Wavelet program) which detected the peak of the R wave for each heart beat and quantified sequential R-R intervals in msec(i.e. heart periods). Heart period data were edited to remove movement artifact. Heart period data were quantified as : 1) mean heart period; 2) vagal tone. Vagal tone was quantitfied with a noninvasive measure developed by Porges(1985) in Mxedit software. To determine behavioral status, tools were developed by Scafidi et al(1990) were used. Collected data were analyzed with the SPSS program using paried t-test, ANOVA, and Pearson correlation. The result were as follow. 1. The results of the ANOVAs indicated that vagal tone were signifcantly lower during bathing than baseline and post-bathing. There were significant differences in heart period and heart rate levels across the bathing. But the mean oxygen saturations and respirations were no differences. Also, there were no significant differences on behavioral sign, motor activity, behavioral distress, weight changes, morbidity, and hospitalization period. 2. To evaluate the relation between vagal tone and subsequent parameters, the two groups (the high group had 19 subjects and low group had 21subjects) were divided by the mean baseline vagal tone. Vagal tone measured prior to bathing were significantly associated with respiration before bathing, vagal tone during bathing, and the magnitude of change in both vagal tone. But, other subsequent reactivities were no differences in two groups. 3. Correlations were also calculated between vagal tone and the subsequent physiological reactivities from baseline through after- bathing. Correlations were significant between baseline vagal tone and baseline heart rate, between baseline vagal tone and baseline heart period, between baseline vagal tone and oxygen saturation after bathing. In summary, the bathing in this study showed a stressful stimulus on premature infants through there was significance in the physiological parameters. In addition, our study represents the documentation that vagal tone reactivity in response to clearly defined external stimulation provides an index of infant's status.

• 감성과학
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• 제7권3호
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• pp.27-35
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• 2004

본 연구는 피부전도도(skin conductance response), 말초혈관 반응(peripheral plethysmograph), 피부온도 (skin temperature)와 심박수(heart rate)와 같은 다양한 생리신호를 측정하여 운전자의 심리반응을 통하여 적정 운전상태를 분석하고자 하였다. 운전자의 심리반응을 측정 및 분석하기 위하여 하드웨어와 알고리듬을 개발하였으며, 운전상황은 자동차 시뮬레이터를 이용하여 다양한 가상 운전상황을 설정하고 생리신호를 측정하였다. 측정 결과 운전자 생리신호가 운전환경의 변화에 따른 심리적 긴장 또는 이완 수준을 잘 반영하고 있고, 감정적 변화에는 다소 둔감한 것으로 나타났다. 이를 심리적 순위척도를 이용하여 정량화하여 심리적 적정 운전범위를 제안하였다. 본 연구의 결과는 추후 운전자의 안전운전이나 건강상태를 모니터링 하기 위한 시스템 개발의 자료로 활용할 수 있을 것이다.

• 한국엔터테인먼트산업학회논문지
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• 제14권5호
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• pp.217-227
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• 2020

본 연구의 목적은 청각자극 증가에 따른 지적장애인의 심박수, 손 기능과 건강관련 삶의 질의 변화를 분석하는데 있다. 연구대상은 지적장애인 16명이다. 청각자극 중가는 음악의 볼륨을 통해 조절되었고, 60dB, 65dB, 70dB로 자극의 강도를 증가시켜 적용하였다. 청각자극 증가에 따라 Xeno 손목형 심박수와 혈압 측정기(LHY Health, Co., China)를 활용하여 심박수를 측정하였다. 손 기능의 측정은 퍼듀 페그보드를 활용하여 손 기능을 측정하였다. 건강관련 삶의 질은 Short-form 8 health survey를 활용하여 평가하였다. 연구결과 청각자극 증가에 따라 심박수가 지속적으로 증가하였으며, 손 기능도 지속적으로 감소하였다. 건강관련 살의 질은 청각자극 적용 후 감소하였다. 이에 청각자극 증가에 따른 심막수와 손 기능, 건강관련 삶의 질의 변화가 나타났다. 본 연구결과에 의하여, 청각자극 증가는 지적장애인의 심리적 불편감으로 작용하게 되어 심박수를 증가시키며, 손 기능과 건강관련 삶의 질을 감소시키는 데 작용하게 된다. 따라서 지적장애인의 심박수의 감소와 손 기능, 건강관련 삶의 질의 향상을 위해 환경자극에서 청각자극 강도를 고려해야 할 것이다.

• 한국엔터테인먼트산업학회논문지
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• 제14권7호
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• pp.519-528
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• 2020

본 연구의 목적은 보행보조차 손잡이 높이에 따른 노인들의 상태불안과 심박수, 낙상효능감의 변화를 분석하는 데 있다. 연구대상은 정상노인 32명이다. 보행보조차는 유모차 형태로 손잡이 높이를 대상자들의 신장의 48%를 기준으로 설정하였으며, 손잡이 높이를 5%씩 감소시켜, 48, 43, 38 %로 구성하였다. 상태불안 평가는 한국판 상태불안 척도를 활용하였으며, 심박수 평가는 Fitbit Charge 2 손목형 심박수 측정기를 활용하였다. 낙삭효능감 평가는 한국판 낙상효능감 척도를 활용하였다. 그 결과, 보행보조차 손잡이 높이에 따라 상태불안과 심박수는 통계적으로 유의미한 증가가 나타났으며, 낙상효능감은 통계적으로 유의미한 감소가 나타났다. 사후검정 결과에서도 상태불안과 낙상효능감의 분석결과 각각의 보행보조차 손잡이 높이에 따라 통계적으로 유의미한 차이가 나타났으며, 심박수의 분석결과 48, 43%의 손잡이 높이와 38%의 손잡이 높이 간의 통계적으로 유의미한 차이가 나타났다. 따라서, 노인들의 보행보조차 사용시 상태불안과 심박수를 감소시키고 낙상효능감을 향상시키기 위해서, 보행손잡이 높이를 적절하게 위치하여야 할 것이며, 보행보조차 사용자 전체 신장의 48%의 위치로 조정하여야 할 것이다.

• IEIE Transactions on Smart Processing and Computing
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• 제5권6호
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• pp.395-402
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• 2016

In these days, the wearable devices have been developed for measuring biological data effectively. However, wearable devices have tissue allege and noise problem. Also, it is impossible for a remote center to identify the person whose data are measured by wearable devices, which could trigger a communication problem over treatment. To solve these problems, biometric measurement based on a non-contact method, such as face image sequencing is necessary. This makes it possible to measure biometric data without any operation and side effects. This system can monitor the biological signals of people in real time without allege and noise and simultaneously identify them. In this paper, we propose an authentication process while measuring biometric data, through a non-contact method.

• 한국임상수의학회지
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• 제40권6호
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• pp.464-467
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• 2023

The autonomic regulation of heart rate (HR) is an indicator of the body's ability to adapt to an exercise stimulus. However, there are no reports on this topic in relation to Jeju horses used for racing. The aim of this study was to analyze the HR responses of Jeju horses during race trials and to investigate the correlation between HR and performance in these horses. HR data were collected from 17 healthy 2- to 7-year-old Jeju horses wearing HR monitors during race trials. Pearson correlation coefficients was used to determine the significance of the association between the race trial time and HR. A significant inverse correlation was observed between the race trial time (performance) and both the maximal HR (HRmax, r = -0.69, p < 0.01) and HR reserve (HRR) (HRmax - average HR during the warm-up period, r = -0.63, p < 0.01) and between the HRR and HRmax (r = 0.73, p < 0.01). Horses with a lower average HR during the warm-up period and higher heart rates during the trial achieved faster race trial times. This study reports the first HR measurements in Jeju horses during race trials, providing new insights into the HR response of this breed to exercise. The use of a noninvasive remote HR monitor system allowed assessment of exercise responses in the field, and the results suggest that both the HRR during warm-up period and HRmax may be useful performance indicators in Jeju horses.

• 대한간호학회지
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• 제26권2호
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• pp.372-386
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• 1996

Recently, the ratio of elderly in the population are fast growing due to socio-economical development and the better medical service. Proportionally, the health problems in elderly are increasing, too. Medical professionals must try so that the elderly have the better life through health promotion and disease prevention as well as disease treatment. This study evaluated the effect of walking exercise program on the cardiorespiratory function and the flexibility in the elderly women. The design of research was one group pretest-posttest design. The subjects were eleven elderly women over sixty years old to live in K-city, Kyonggi-do. The type of exercise was walking, which was the most popular exercise in questionnaire. The exercise intensity was 40％∼60％ of the target heart-rate by Karvonen's method and maintained by the heart-rate monitor. The exercise period was five weeks and the exercise frequency was three times per week. The exercise duration was forty minutes at first and gradually increased up to an hour. In order to evaluate the effect of walking exercise, we measured VO/sub₂ max, resting heart -rate, systolic/diastolic blood pressure, FVC, FEV/sub₁, the flexibility before and after the five week's exercise program. The data are analyzed by the paired t-test and Wilcoxon signed rank test using SAS package. The results are as follows : 1) The hypothesis that cardiorespiratory function will be improved was partly supported. In VO/sub₂ max（p＝0.0001）, resting heart-rate（p＝0.0030）, systolic/diastolic blood-pressure（p＝0.0387／ p＝0.0024）, there was significant difference. FVC and FEV/sub₁ were increased after the exercise, but there were no significant difference. 2) The hypothesis that the flexibility will be improved was supported. There was significant difference in the flexibility（p＝0.0140）. As the further study, it is necessary to reevaluate the effect with more refined design. We also need to try meta-analysis about the results of previous studies obtained in the experimental setting and compare our result obtained in the field setting with them.