• Title/Summary/Keyword: Heart Work

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Qualitative Analysis of the Free Amino Acids in Gallula tornieri Tissues (맹꽁이 조직내 유리 아미노산의 정성적 분석)

  • 하두봉;이양림
    • The Korean Journal of Zoology
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    • v.4 no.2
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    • pp.7-12
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    • 1961
  • The present work deals with the patterns of the free amino acids in several tissues of Gallula tornieri VOGT analysed by means of paper chromatography and ion-exchange resins. The tissues used were heart, stomach , muscle, brain , testis , skin , and liver. 14 amino acid was detected in heart, 11 in muscle , 15 in stomach , 9 , in brain , 10 in skin in liver , and 10 in testis. It was found that there were distinguishable differences in the patterns of the free amino acids among the different tissues.

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Measurement of workload by cardiac arrhythmia (부정맥을 이용한 작업부하의 평가)

  • 박영택;박경수
    • Journal of the Ergonomics Society of Korea
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    • v.2 no.2
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    • pp.3-10
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    • 1983
  • While three subjects were running on treadmill at five different speeds, their heart beat interval times were measured and analyzed. From the analysis, we discovered some relation- ships between workload and cardiac response, especially cardiac arrhythmia. Using these relationships, a physioligical model for estimating workload was developed. Although pulse rate has been considered as a good measure of physical load, this study shows that it is highly subject dependent and therefore unsuitable for task evalution. It is recommended to use range of heart beat interval times rather than pulse rate in the evaluation of light work.

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Studies on The Diseases of the Korean Native Goat-A Review (우리나라 재래염소의 질병에 관한 연구-문헌조사)

  • 이정길;이채용;곽형수
    • Journal of Veterinary Clinics
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    • v.17 no.1
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    • pp.32-44
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    • 2000
  • The Korean native goat has been extensively used in the experimental work. Compared to those experimental work employing the goat, reports on their diseases have been scarcely documented. In the present communication, authors reviewed the literatures pertaining to the diseases of the Korean native goat. Diseases of the respiratory system, the alimentary tract, the liver, the musculoskeletal system, the skin, the urogenital system, the nervous system, the eye, and the heart were reviewed. And then metabolic, toxic, and parasitic diseases were reviewed. Of those diseases reviewed, diseases of the heart and kidney, and metabolic and toxic diseases were wholly artificially-induced. Except the parasitic diseases, a considerable number of diseases of other organ systems were also artificially-induced. And the parasitic diseases reported were confined to the internal parasites. Authors feel that the known occurrence of diseases would help diagnose new disease in the goat.

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Development of Real-Time Mental Work Load Measurement System using Heart Rate Variability base on Personal Computer (심박변화율을 이용한 PC 기반 실시간 정신작업부하 측정시스템 개발)

  • 고한우;윤용현;양희경;김동윤
    • Science of Emotion and Sensibility
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    • v.4 no.1
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    • pp.1-5
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    • 2001
  • The evaluation of mental workload is measured by subjective ratings, physiological signals. It takes long time to analysis the measured signals and is very tedious and time-consumming work. Therefore, to evaluate the affect of workload effectively, real-time measurement system is required. In this paper, real-time mental workload measurement system using cardiac autonomic indiced which reflect well the mental workload was developed and evaluated. Analyzed indices were HR, IBI, Lorentz plot, CSI, CVI, and LF/HF ratio of heart rate variability. The system was applied to evaluate the affect of arithmetic task and showed good results. This system was consisted of ECG amplifier, A/D converter, and personal computer, and algorithm was implemented using LabVIEW.

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Thermo Physiological responses of Far Infrared Ray Radiation Fabrics at outdoor in summer (옥외에서 원적외선 방사직물 착용시 온열생리반응)

  • 송명견;안필자;최정화
    • Korean Journal of Rural Living Science
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    • v.7 no.2
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    • pp.121-128
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    • 1996
  • This study was performed to define the effects of Far Infrared Ray Radiation Fabrics as summer garments during outdoor work by human trial. One healthy male subject was volunteered for this study. Experimental garments consisted of three kinds of trousers (Cotton, Cotton/linen blended, Far Infrared Ray Radiation Fabric/wool blended) and basic garments (panty, socks, shirts, and dress shirts). The measurements were rectal temp., skin temp., microclimate inside clothing, heart rate, subjective sensation etc. The results were as follows : 1. Rectal temperature showed the lowest in Far Infrared Ray Radiation Fabrics among 3 garments. 2. Skin temperature (forehead, chest abdomen temp.) and mean skin temperature were lower in Far Infrared Ray Radiation Fabrics than in others, especially during early stage of work. 3. Heart rate showed lower value in Far Infrared Ray Radiation Fabrics than in others but there was no significance among the garments. 4. Humidity inside clothing and total weight loss showed the highest value in Far Infrared Ray Radiation Fabrics.

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Basic Study on Safety Accident Prevention System Development Using Wearable Device (웨어러블 장치를 이용한 건설사고 예방 시스템 개발 기초 연구)

  • Ryu, Han-Guk;Kang, Jin-Woo
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2018.11a
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    • pp.55-56
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    • 2018
  • In order to reduce the risk of accidents, we proposed a construction safety management system combined with wearable device and LoRa (Low-Range Wireless Network) communication method to apply the usefulness of Internet (IoT) technology which means "everything connected". to construction safety management Management system. The proposed wearable safety device is a device that relays information exchange between wearable safety device and safety management server by LoRa wireless communication method. The safety management server can store workers bio-data and perform big data analysis. If a risk factor is determined from the analysis result, a warning is sent to the wearable safety device and the manager's application. The goal of this system is to prevent construction workers from entering the dangerous area that is not suitable for work, and to prevent safety accidents caused by human cause by detecting abnormal condition during work.

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Development of algorithm for work intensity evaluation using excess overwork index of construction workers with real-time heart rate measurement device

  • Jae-young Park;Jung Hwan Lee;Mo-Yeol Kang;Tae-Won Jang;Hyoung-Ryoul Kim;Se-Yeong Kim;Jongin Lee
    • Annals of Occupational and Environmental Medicine
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    • v.35
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    • pp.24.1-24.15
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    • 2023
  • Background: The construction workers are vulnerable to fatigue due to high physical workload. This study aimed to investigate the relationship between overwork and heart rate in construction workers and propose a scheme to prevent overwork in advance. Methods: We measured the heart rates of construction workers at a construction site of a residential and commercial complex in Seoul from August to October 2021 and develop an index that monitors overwork in real-time. A total of 66 Korean workers participated in the study, wearing real-time heart rate monitoring equipment. The relative heart rate (RHR) was calculated using the minimum and maximum heart rates, and the maximum acceptable working time (MAWT) was estimated using RHR to calculate the workload. The overwork index (OI) was defined as the cumulative workload evaluated with the MAWT. An appropriate scenario line (PSL) was set as an index that can be compared to the OI to evaluate the degree of overwork in real-time. The excess overwork index (EOI) was evaluated in real-time during work performance using the difference between the OI and the PSL. The EOI value was used to perform receiver operating characteristic (ROC) curve analysis to find the optimal cut-off value for classification of overwork state. Results: Of the 60 participants analyzed, 28 (46.7%) were classified as the overwork group based on their RHR. ROC curve analysis showed that the EOI was a good predictor of overwork, with an area under the curve of 0.824. The optimal cut-off values ranged from 21.8% to 24.0% depending on the method used to determine the cut-off point. Conclusion: The EOI showed promising results as a predictive tool to assess overwork in real-time using heart rate monitoring and calculation through MAWT. Further research is needed to assess physical workload accurately and determine cut-off values across industries.

Heart Failure Occurred during Endoscopic Transthoracic Sympathetic Cauterization -A case report- (흉강경하 교감신경절 소작술중 발생한 심부전 -증례 보고-)

  • Lee, Youn-Woo;Yoon, Duck-Mi;Ahn, Eun-Kyoung;Seouk, Mi-Ja
    • The Korean Journal of Pain
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    • v.9 no.1
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    • pp.235-238
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    • 1996
  • Hyperhidrosis is the distressing condition of abnormal sweating which affects the palm, sole and axillary region. Transthoracic endoscopic sympathectomy is recommended as the treatment of choice for hyperhidrosis, especially when the upper limbs are affected. We experienced a case of accidental cauterization of right azygos vein in a healthy 23 year old male during endoscopic transthoracic sympathectomy. We changed the single lumen endotracheal tube to a double lumen tube which made it easier to perform the explo-thoracotomy and bleeder ligation under one lung ventilation. Crystalloid and colloid solutions, and packed RBC were loaded during explo-thoracotomy. Monitoring showed the signs indicating pulmonary edema. Pulmonary arterial catheterization revealed global heart failure. The patient was transfered to ICU for intensive management for heart failure. On the 4th postoperative day, pulmonary edema and heart failure were cured; and the patient was extubated. But in the evening of the same day ST-segment elevation and Q-wave were noted on ECG monitoring. On the 13th postoperative day coronary angiography was performed. This revealed left apex focal hypokinesia, patent coronary artery and accidental right coronary spasm, treated by vasodilator. On the 14 day, after surgery, he was discharged to return to work.

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Energetics of the Heart Model with the Ventricu1ar Assist Device

  • Chung, Chanil-Chung;Lee, Sang-Woo;Han, Dong-Chul;Min, Byoung-Goo
    • Journal of Biomedical Engineering Research
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    • v.17 no.1
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    • pp.43-48
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    • 1996
  • We investigated the energistics of the physiological heart model by comparing predictive indexes of the myocardial oxygen consumption (MOC), such as tension-time index (R), tension-time or force-time inteual (FTI), rate-pressure product (RPP), pressure-work index, and systolic pressure-volume area (PVA) when using the electro-hydraulic left ventricular device (LVAD). We developed the model of LVAD incorporated the closed-loop cardiovascular system with a baroreceptor which can control heart rate and time-varying elastance of left and right ventricles. On considering the benefit of the LVAD, the effects of various operation modes, especially timing of assistance, were evaluated using this coupled computer model. Overall results of the computer simulation shows that our LVAD can unload the ischemic (less contractile) heart by decreasing the MU and increasing coronary flow. Because the pump ejection at the end diastolic phase of the natural heart may increase the afterload of the left ventricle, the control scheme of our LVAD must prohibit ejecting at this time. Since the increment of coronary flow is proportional to the peak aortic pressure after ventricle contraction, the LVAD must eject immediately following the closure of the aortic valve to increase oxygen availability.

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Cardiac hypertrophy and abnormal $Ca^{2+}$ handling in transgenic mice overexpressing jnnctate

  • Hong, Chang-Soo;Cho, Myeong-Chan;Kwak, Yong-Geun;Chane, Soo-Wan;Kim, Do-Han
    • Proceedings of the Korean Biophysical Society Conference
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    • 2003.06a
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    • pp.52-52
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    • 2003
  • Junctate is a newly identified integral ER/SR membrane $Ca^{2+}$ binding protein, which is an alternative splicing form of the same gene generating aspartyl $\square$-hydroxylase and junctin. To elucidate the functional role of junctate in heart, transgenic (TG) mice overexpressing mouse cardiac junctate-1 under the control of mouse $\square$$^{~}$ myosin heavy chain promoter were generated. Overexpression of junctate in mouse heart resulted in cardiac hypertrophy, increased fibrosis, bradycardia, arrhythmias and impaired contractility. Overexpression of junctate also led to down-regulation of SERCA2, calsequestrin, calreticulin and RyR, but to up-regulation of NCX and PMCA. The SR $Ca^{2+}$ content decreased and the L-type $Ca^{2+}$ current density and the action potential durations increased in TG cardiomyocytes, which could be the cause for the bradycardia in TG heart. The present work has provided an important example of pathogenesis leading to cardiac hypertrophy and arrhythmia, which was caused by impaired $Ca^{2+}$ handling by overexpression of junctate in heart.n heart.

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