Annals of Occupational and Environmental Medicine

Jong Hak Chung

14 Articles

The Effects of Indoor Air Quality on the Neurobehavioral Performance of Elementary School Children: Dae Seop Kim, Sun Ju Kim, Si Young Park, Man Joong Jeon, Gyu Tae Kim, Chang Yoon Kim, Jong Hak Chung, Sung Ok Baek, Joon Sakong; Korean Journal of Occupational and Environmental Medicine 2007;19(1):65-72. Published online March 31, 2007; DOI: https://doi.org/10.35371/kjoem.2007.19.1.65

OBJECTIVES
Most studies on the indoor air quality of newly built schools have focused only on the number of schools exceeding a standard or on subjective symptoms, such as sneezing, irritated eyes and an irritated nose. However, there has been no report on how poor indoor air quality affects children's academic performance. This study evaluated the effects of indoor air quality on the neurobehavioral performance of elementary school children.
METHODS
This study measured the indoor air pollutants and compared children's performance, using a computerized neurobehavioral test, between a newly built and a 12-year-old school. In addition, a questionnaire was administered regarding the indoor air quality related symptoms of children in a newly built and a 12-year-old school.
RESULTS
In the newly built school, the formaldehyde levels in the 1st and 4th classes with an open window were 34.6 and 27.3 microgram/m3, respectively. The levels in the 1st and 4th classes with the window closed were 80.2 and 127.1 microgram/m3, respectively. In the 12-year-old school, the formaldehyde levels in 1st and 4th class with open and closed window were 12.6 and 7.5 microgram/m3, and 19.8 and 25.2 microgram/m3, respectively. With respect to total volatile organic compounds, the levels in the 1st and 4th classes with the window open in the newly built school were 87.2 and 428.2 microgram/m3, respectively. In the 1st and 4th classes with the window closed, the total volatile organic compounds were 1,283.5 and 1,715.4 microgram/m3, respectively. In the 12-year-old school, the total volatile organic compounds were 240.9 and 150.8 microgram/m3, and 371.9 and 448.0 microgram/m3 in the 1st and 4th classes, respectively. In the case of a newly built school, the performance of the students in the neurobehavioral test in the 4th class with the window closed was 8.3% lower than for those in the 1st class with the window closed, but was only 5.9% lower when the windows were open. There was a statistical significant difference in the total numbers of symptoms between the two schools.
CONCLUSIONS
These results suggest a proper evaluation of the indoor air quality within schools is required into both the level of contamination and the health effects of these contaminants toward children.

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Performance assessment on the Korean Computerized Neurobehavioral Test using a mobile device and a conventional computer: an experimental study
Young Seok Byun, Sung Kyu Park, Joon Sakong, Man Joong Jeon
Annals of Occupational and Environmental Medicine.2018;[Epub] CrossRef
Occupational Neurologic Disorders in Korea
Yangho Kim, Kyoung Sook Jeong, Yong-Hun Yun, Myoung-Soon Oh
Journal of Clinical Neurology.2010; 6(2): 64. CrossRef

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Blood Pb, Urine Cd and Health Assessment of Residents in the Vicinity of Abandoned Mines in Gyeongsangbuk-do: Jong Hak Chung, Pock Soo Kang, Chang Yoon Kim, Kyung Soo Lee, Tae Yoon Hwang, Gyu Tae Kim, Jong Seo Park, Si Young Park, Dae Seop Kim, Ou Taek Lim, Joon Sakong; Korean Journal of Occupational and Environmental Medicine 2005;17(3):225-237. Published online September 30, 2005; DOI: https://doi.org/10.35371/kjoem.2005.17.3.225

Abstract PDF

OBJECTIVES
The objective of this health assessment is to evaluate the health risks that may result from exposure to abandoned mine tailings in Gyeongsangbuk-do. The tailings are remnants from an earlier flotation mill and mining operation that was in business from the early 1930's until 1970.
METHODS
The soil, stream water, and drinking water in and around three abandoned mine areas, Soochul, Gumjang, Darock, and three control areas located in Gyeongsangbuk-do were analyzed for level of Cd, Pb, Cu, As, and Hg. Potential chronic health effects were evaluated by interview and medical examination.
RESULTS
Some soil and stream samples exceeded the Korean standard for soil contamination in farmland and the Korean standard of water contamination in streams respectively. Blood lead (5.37 microgram/dl) and urine cadmium (2.79 microgram/g Cr) levels of the residents in the vicinity of the abandoned mine sites were significantly higher than of the residents in the control areas (blood lead, 4.34 microgram/dl; urine cadmium, 1.62 microgram/g Cr). There were no significant differences between the mining and control areas in terms of blood pressure, Hb, BUN, creatinine, SGOT, SGPT, fasting blood sugar, and the prevalence of potential chronic diseases.
CONCLUSIONS
The results of the assessment suggested that the three abandoned mine sites do not pose an apparent health risk to nearby residents. Nevertheless, the elevated blood lead and urine cadmium levels in the residents of the abandoned mine site suggested that it might be an important source of heavy metals contamination. Therefore, a nationwide evaluation program is needed to assess the potential health risks of residents living in the vicinity of abandoned mine sites.

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Bioaccumulation of Lead, Cadmium, and Arsenic in a Mining Area and Its Associated Health Effects
Ulziikhishig Surenbaatar, Seungho Lee, Jung-Yeon Kwon, Hyunju Lim, Jeong-Jin Kim, Young-Hun Kim, Young-Seoub Hong
Toxics.2023; 11(6): 519. CrossRef
Association between levels of exposure to heavy metals and renal function indicators of residents in environmentally vulnerable areas
Jung-Yeon Kwon, Seungho Lee, Ulziikhishig Surenbaatar, Hyoun-Ju Lim, Byoung-Gwon Kim, Sang-Yong Eom, Yong Min Cho, Woo Jin Kim, Byeng-Chul Yu, Kwan Lee, Young-Seoub Hong
Scientific Reports.2023;[Epub] CrossRef
Association of Blood Heavy Metal Levels and Renal Function in Korean Adults
Yoonjin Park, Su-Jung Lee
International Journal of Environmental Research and Public Health.2022; 19(11): 6646. CrossRef
Potential of biochar for clean-up of heavy metal contaminated soil and water
Adaobi Onmonya Yvonne, Galadima Adamu Sadiq, Sadiq Maryam
African Journal of Environmental Science and Technology.2022; 16(4): 146. CrossRef
A review on heavy metal and metalloid contamination of vegetables: addressing the global safe food security concern
Sweta, Bhaskar Singh
International Journal of Environmental Analytical Chemistry.2022; : 1. CrossRef
Exposure factors of cadmium for residents in an abandoned metal mine area in Korea
Seung Chul Ahn, Jun Young Chang, Jung Sub Lee, Hwa Yon Yu, A-Ra Jung, Jee-Young Kim, Jong-Woo Choi, Young-Seoub Hong, Seung Do Yu, Kyounghee Choi
Environmental Geochemistry and Health.2017; 39(5): 1059. CrossRef
Time trend of cadmium intake in Korea
Chan-Seok Moon, Hye-Ran Yang, Haruo Nakatsuka, Masayuki Ikeda
Environmental Health and Preventive Medicine.2016; 21(3): 118. CrossRef
Measuring the Environmental Burden of Disease in South Korea: A Population-Based Study
Seok-Jun Yoon, Hyeong-Su Kim, Jongsik Ha, Eun-Jung Kim
International Journal of Environmental Research and Public Health.2015; 12(7): 7938. CrossRef
Blood Cadmium Concentration of Residents Living near Abandoned Metal Mines in Korea
Young-Seoub Hong, Byung-Kook Lee, Jung-Duck Park, Joon Sakong, Jae-Wook Choi, Jai-Dong Moon, Dae-Seon Kim, Byoung-Gwon Kim
Journal of Korean Medical Science.2014; 29(5): 633. CrossRef
Association of arsenic levels in soil and water with urinary arsenic concentration of residents in the vicinity of closed metal mines
YongMin Cho, SungChul Seo, Seung-Hyun Choi, SeungKil Lee, KyungHee Kim, Hae-Joon Kim, Jae-Wook Choi
International Journal of Hygiene and Environmental Health.2013; 216(3): 255. CrossRef
Relationship between Urine Cadmium and Bone Mineral Density of Residents Around Abandoned Metal Mines
Kyung-Sick Jung, Nam-Soo Kim, Seung-Chul Ahn, Byung-Kook Lee
Korean Journal of Environmental Health Sciences.2012; 38(4): 323. CrossRef
The association of heavy metals in blood, fish consumption frequency, and risk of cardiovascular diseases among Korean adults: The Korean National Health and Nutrition Examination Survey (2008-2010)
Ji-Ye Shin, Ji-Myung Kim, Yuri Kim
Korean Journal of Nutrition.2012; 45(4): 347. CrossRef
Blood lead levels of residents living around 350 abandoned metal mines in Korea
Nam-Soo Kim, Joon Sakong, Jae-Wook Choi, Young-Seoub Hong, Jai-Dong Moon, Byung-Kook Lee
Environmental Monitoring and Assessment.2012; 184(7): 4139. CrossRef
The Effect of Exposure Factors on the Concentration of Heavy Metals in Residents Near Abandoned Metal Mines
Sanghoo Kim, Yong-Min Cho, Seung-Hyun Choi, Hae-Joon Kim, Jaewook Choi
Journal of Preventive Medicine and Public Health.2011; 44(1): 41. CrossRef
Lessons of Goseong Abandoned Metal Mine Accident
Ho-Jang Kwon
Korean Journal of Environmental Health Sciences.2011; 37(5): 335. CrossRef
Relationship between Heavy Metal Concentrations in the Soil with the Blood and Urine of Residents around Abandoned Metal Mines
Bong-Ki Jang, Sang-Il Park, Nam-Soo Kim, Kyung-Sick Jung, Byung-Kook Lee, Jong-Wha Lee
Korean Journal of Environmental Health Sciences.2011; 37(5): 348. CrossRef
Blood Lead Level in Populations Resident in Some Abandoned Mine Area
Sun-Ho Song, Sang-Yong Eom, Yong-Dae Kim, Heon Kim, Jang-Soo Hong
Journal of Environmental Science International.2010; 19(4): 527. CrossRef
Investigation on Health Effects of an Abandoned Metal Mine
Soyeon Kim, Ho-Jang Kwon, Hae-Kwan Cheong, Kyungho Choi, Jae-Yeon Jang, Woo-Chul Jeong, Dae-Seon Kim, Seungdo Yu, Young-Wook Kim, Kwang-Young Lee, Seoung-Oh Yang, Ik Jae Jhung, Won-Ho Yang, Yun-Chul Hong
Journal of Korean Medical Science.2008; 23(3): 452. CrossRef

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Effects of Familiarity with Computer and Type of Keyboard on Computerized Neurobehavioral Performance Tests: Man Joong Jeon, Chang Yoon Kim, Jong Hak Chung, Woo Taek Lim, Joon Sakong; Korean Journal of Occupational and Environmental Medicine 2004;16(2):178-190. Published online June 30, 2004; DOI: https://doi.org/10.35371/kjoem.2004.16.2.178

Abstract PDF

OBJECTIVES
A stratified cross-over study was conducted to evaluate the effects of familiarity with computer on the performance of computerized neurobehavioral tests. Effects of keyboard type on the relationship between familiarity with computer and performance of computerized neurobehavioral tests were also examined.
METHODS
We tested 70 persons classified into three groups according to degree of familiarity with computer: Group 1 was people with no computer competency, Group 2 had slight working experience on the computer, and Group 3 were highly competent and efficient on the computer. For each group, we executed 4 tests of the Korean version of the Swedish Performance Evaluation System (Simple Reaction Time, Addition, Symbol Digit, and Finger Tapping Speed). Three types of keyboard were applied for all three groups. Type 1 keyboard was a conventional layout with 106 keys. We removed the unused keys except for the 17 which were used in the test and remodeled the normal keyboard into Type 2 keyboard with 17 keys (10 numeric keys, 4 arrow keys, space bar, and both Ctrl keys). Type 3 keyboard with 11 keys consisted of 10 numeric keys and the space bar was newly developed for the computerized neurobehavioral performance test.
RESULTS
It was found that Simple Reaction Time, Addition, and Finger Tapping Speed were not affected by familiarity with computer and type of keyboard. The mean reaction time of Symbol Digit adjusted by age and educational level with Type 1 keyboard was found to have significant difference among the three groups (F=3.347, p=0.041). The performance of Symbol Digit in Group 1 was found to be significantly lower than that in Group 2. The performances of Symbol Digit measured with Types 2 and 3 keyboards were not found to have significant differences among the three groups. In Groups 1 and 3, the performances of Symbol Digit measured with Type 1 keyboard were found to be significantly lower than those of other keyboards.
CONCLUSIONS
According to the above results, Simple Reaction Time, Addition, and Finger Tapping Speed have high priority over other neurobehavioral tests for the workers having varying degrees of computer familiarity. It is also suggested that familiarity with computer and keyboard type needs to be considered in interpretation of the performance of Symbol Digit. We recommended executing the computerized neurobehavioral test with keyboards 2 or 3 to reduce the effect of computer familiarity.

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Performance assessment on the Korean Computerized Neurobehavioral Test using a mobile device and a conventional computer: an experimental study
Young Seok Byun, Sung Kyu Park, Joon Sakong, Man Joong Jeon
Annals of Occupational and Environmental Medicine.2018;[Epub] CrossRef
Effects of computer familiarity and computer type on the performance of Korean computerized neurobehavioral test
Nak Joon Baek, Gun Il Park, Young Seok Byun, Man Joong Jeon, Joon Sakong
Annals of Occupational and Environmental Medicine.2016;[Epub] CrossRef
Assessment of Availability of Korean Computerized Neurobehavioral Test in Patients with Brain Injury
Tae-Hoon Kim, Man-Joong Jeon, Joon Sakong
The Journal of the Korea Contents Association.2013; 13(6): 339. CrossRef
Neurobehavioral Changes of Shipyard Painters Exposed to Mixed Organic Solvents
Choong Ryeol LEE, Kyoung Sook JEONG, Yangho KIM, Cheol In YOO, Ji Ho LEE, Young Hee CHOI
INDUSTRIAL HEALTH.2005; 43(2): 320. CrossRef

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Assessment of Job Related Factors as Determinants of Incidence of Herniated Lumbar Disc: Joong Jung Lee, Jong Hak Chung; Korean Journal of Occupational and Environmental Medicine 2001;13(1):31-43. Published online March 31, 2001; DOI: https://doi.org/10.35371/kjoem.2001.13.1.31

Abstract PDF: OBJECTIVES
A case-control study was conducted on 2,323 male soldiers(771 herniated nucleus pulposus patients and 1542 controls) to identify risk factors for cumulative trauma disorders especially lower back.
METHODS
The collecting data included individual physical, psychological, and work environmental factors. Korea Military Personality Inventory(KMPI) was used to examine the assess trait that have been associated with clinically with herniated nucleus pulposus. A measurement of the workplace support system was obtained by using of the modified work APGAR, a brief, seven-item workplace function questionnaire.
RESULTS
The herniated nucleus pulposus patients were more common among Artillerymen and Engineer than among infantrymen. In logistic regression analysis of military occupational specialties, Artillerymen, Engineer, radio operator, driver were higher risk of herniated nucleus pulposus than infantrymen. Multivariate analysis of KMPI scales found hypochondriasis scale, hysteria scale, hypomania scale, social introversion scale to have strong relationship to incidence of herniated nucleus pulposus. And 'can communicate with peers' and 'enjoy job task' item of modified work APGAR to have strong relationship to incidence of herniate nucleus pulposus CONCLUSIONS: Study of the relative contributions of many physical and non physical variable shows that evaluations of back problems in workplace that exclude these highly significant work perception and psychosocial variables are of limited value. Simple, unidimensional approaches that ignore the effect of work perceptions and psychological factors on back problems reporting oversimplify a multifaceted problem. These findings emphasize the importance of adopting a broader approach to the multifaceted problem of back complaint in workplace.

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Assessment of Job Related Cumulative Trauma Disorders of Dentists in Daegu Metropolitan City: Man Joong Jeon, Joon Sakong, Joong Jung Lee, Hee Kyung Lee, Jong Hak Chung; Korean Journal of Occupational and Environmental Medicine 2001;13(1):55-63. Published online March 31, 2001; DOI: https://doi.org/10.35371/kjoem.2001.13.1.55

Abstract PDF

OBJECTIVE: To investigate the symptom prevalence and aspects of symptoms for cumulative trauma disorders in dentists and elucidate their associated factors.
METHODS
A questionnaire-based investigation on demographic factors, work-related characteristics, psychosocial factors and symptoms of 512 dentists practicing in Daegu metropolitan city was conducted. Subsets of psychosocial characteristics, including job demand(5 items), psychosomatic strain(5 items), job insecurity, and type A behavior were also assessed. For the evaluation of symptoms early developed questionnaire by Song(1997)was used to investigate the parameters related to pains in the neck, shoulder, arm and elbow, wrist, finger, back or discomforts, such as pricking and numbing.
RESULTS
The symptom prevalence of cumulative trauma disorders, calculated based on NIOSH criteria, was high at 63.3 %; the most frequent site of complaint was the shoulder, followed by neck, back, hand and wrist, knee, foot and ankle. The most common approach position was direction of 9 to 10 o'clock. Most subjects had 5-10 years of work experience and those with such years of experience also complained most frequently of symptoms in the neck and shoulder areas. As to rate of symptom complaint according to the type of dental procedure, the highest rate was associated to periodontic treatment. According to age, those between the age of 30-40 had the highest symptom prevalence rate at 70 %. According to sex, women had the higher symptom prevalence rate. Unmarried subjects also had higher symptom prevalence rate. The results of logistic analysis showed that the higher the psychosomatic strain and job demand, the higher the symptom prevalence rate of cumulative trauma disorders. Moreover, the higher the score of type A behavior, the higher the symptom prevalence rate, and even those who changed the location of their practice for the last three months also showed high symptom prevalence rate.
CONCLUSIONS
The results of multiple logistic regression analysis, which incorporated demographic, work-related and psychosocial characteristics as independent variables, showed that women were at a higher risk than men in developing cumulative trauma disorders; and that the higher the psychosomatic strain and more frequent type A behavior, the higher the risk of developing cumulative trauma disorders. The above results seem to suggest that not only continual, repeated fine and skillful musculoskeletal movements and lengthy hours in an uncomfortable position but also the psychological stress related to patient satisfaction, can lead to cumulative trauma disorders.

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An influence of operator's posture on the shape of prepared tooth surfaces for fixed partial denture
In-Jae Won, Kung-Rock Kwon, Ahran Pae, Dae-Gyun Choi
The Journal of Korean Academy of Prosthodontics.2011; 49(1): 38. CrossRef

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Evaluation of Reliability of Traditional and Computerized Neurobehavioral Tests: Joon Sakong, Jong Hak Chung, Man Joong Jeon, Mal Suk Shin; Korean Journal of Occupational and Environmental Medicine 2000;12(4):494-500. Published online December 31, 2000; DOI: https://doi.org/10.35371/kjoem.2000.12.4.494

Abstract PDF

OBJECTIVES
Thls study was conducted to select more reliable neurobehavioral tests that are compatible with the characteristlcs of Korean workers and their health management system.
METHODS
To compare the reliability of neurobehavioral tests, test and retest of five computerized and five traditional neurobehavioral tests administered to 85 medical school students and 35 hospital workers. The computerized tests include Simple reaction time, Addition, Symbol digit, Digit span, and Finger tapping speed, while the traditional tests include the trenton visual retention test, Digit symbol, Digit span, Pursuit aiming, and Pegboard.
RESULTS
Computerized Addition was found to have the highest test-retest reliability (0.90) of and followed by Finger tapping speed (nondominant hand, 0.89, dominant hand, 0.85), Symbol digit(0.82), and Digit span(0.74). Only two traditional tests, Digit symbol(0.86), and Pursuit aiming(0.72), showed test-retest reliability coefficient greater than 0.70.
CONCLUSIONS
These results suggest that the computerized Additions, Symbol digit, Fingel tapping speed, and traditional Digit symbol are more satisfactory for our purposes. These results may allow a reasonable selection of the most appropriate tests for periodical evaluation of central nervous system of workers exposed to neurotoxic substances in Korea.

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Performance assessment on the Korean Computerized Neurobehavioral Test using a mobile device and a conventional computer: an experimental study
Young Seok Byun, Sung Kyu Park, Joon Sakong, Man Joong Jeon
Annals of Occupational and Environmental Medicine.2018;[Epub] CrossRef
Analyzing Factors Affecting Cognitive Function in the Elderly using Computerized Neurocognitive Tests
Joohee Shim, Seungwan Kang
Journal of Korean Academy of Community Health Nursing.2017; 28(2): 107. CrossRef
Effects of computer familiarity and computer type on the performance of Korean computerized neurobehavioral test
Nak Joon Baek, Gun Il Park, Young Seok Byun, Man Joong Jeon, Joon Sakong
Annals of Occupational and Environmental Medicine.2016;[Epub] CrossRef
Neurobehavioral function in children with low blood lead concentrations
Jin-Young Min, Kyoung-Bok Min, Sung-Il Cho, Rokho Kim, Joon Sakong, Domyung Paek
NeuroToxicology.2007; 28(2): 421. CrossRef
Parental effects on children's neurobehavioral function
Kyoung-Bok Min, Jin-Young Min, Domyung Paek, Joon Sakong, Sung-Il Cho
NeuroToxicology.2007; 28(2): 426. CrossRef
Effect of occupational manganese exposure on the central nervous system of welders: 1H magnetic resonance spectroscopy and MRI findings
Eun A. Kim, Hae-Kwan Cheong, Dae Seob Choi, Joon Sakong, Jae Wook Ryoo, Injeong Park, Dong Mug Kang
NeuroToxicology.2007; 28(2): 276. CrossRef
Cross-Cultural Comparison of Neurobehavioral Performance in Asian Workers
Jong-Hak Chung, Joon Sakong, Pock-Soo Kang, Chang-Yoon Kim, Kyeong-Soo Lee, Man-Joong Jeon, Nak-Jung Sung, Sang-Ho Ahn, Kyu-Chang Won
NeuroToxicology.2003; 24(4-5): 533. CrossRef

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Assessment of Neurobehavioral Performance among Welders Exposed to Manganese: Nak Jung Sung, Joon Sakong, Jong Hak Chung, Dae Seong Kim, Joong Jung Lee, Jong Tae Park; Korean Journal of Occupational and Environmental Medicine 2000;12(3):327-337. Published online September 30, 2000; DOI: https://doi.org/10.35371/kjoem.2000.12.3.327

Abstract PDF

OBJECTIVES
A cross sectional study was carried out in the welders exposed to manganese and control group. The aim of this study was to assess the adverse effects of manganese on central nervous system of welders.
METHODS
The study group consisted of 49 welders and the reference group, 49 workers matched with welders for age and educational level in automobile manufacturing company. Concentration of manganese in welding hume, in blood, and cumulative exposure index(CEI) were determined for each subject. For each group, computerized neurobehavioral test including Simple Reaction Time, Digit Symbol, Digit Span, and Finger Tapping Speed of Swedish Performance Evaluation System were applied.
RESULTS
Exposure level of manganese in welders were very low(mean CEI 0.069). Welders exposed to manganese had slower response speed, slower motor steadiness, and shorter memory span than control group. But these differences were not statistically significant. The performance of Finger Tapping Speed tended to lower as environmental and biological exposure index got higher. Other neurobehavioral tests were found to have a little association with the exposure indices.
CONCLUSIONS
There was no significant difference of neurobehavioral performance between welders and control group. This study indicates that Finger Tapping Speed measuring motor steadiness might be a one of useful tests for early detection of adverse effects of welding on central nervous system.

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Effects of computer familiarity and computer type on the performance of Korean computerized neurobehavioral test
Nak Joon Baek, Gun Il Park, Young Seok Byun, Man Joong Jeon, Joon Sakong
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A Study on the Total, Particle Size-Selective Mass Concentration of Airborne Manganese, and Blood Manganese Concentration of Welders in a Shipbuilding Yard
Jong Su Park, Pan Gyi Kim, Jee Yeon Jeong
Journal of Korean Society of Occupational and Environmental Hygiene.2015; 25(4): 472. CrossRef
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Kyeong-Sook Choi, Seong-Kyu Kang
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Musculoskeletal Disorders and Related Factors of Symphony Orchestra Players: Nak Jung Sung, Joon Sakong, Jong Hak Chung; Korean Journal of Occupational and Environmental Medicine 2000;12(1):48-58. Published online March 31, 2000; DOI: https://doi.org/10.35371/kjoem.2000.12.1.48

Abstract PDF

OBJECTIVES
Several studies have shown that performance related musculoskeletal disorders present a significant and common health problem for instrument players. This study was conducted to investigate the symptom prevalence rate of performance-related musculoskeletal disorders and risk factors on symphony orchestra players.
METHODS
The symptom prevalence rate of musculoskeletal disorders and related factors including demographic factors, occupational factors, psychosocial factors, practice and performance-related behaviors of on 156 symphony orchestra players in Taegu city were surveyed with a self-administered questionnaire.
RESULTS
Instrument players have performed for 14. 6 years in average and worked 4. 9 for years in average as a member of symphony orchestra. The subjects consisted of 106 string players, 48 wind players, and 8 percussion players. The symptom prevalence rate of musculoskeletal disorders according to the NIOSH surveillance criteria was 79. 6 % and operational criteria by authors was 45. 9 %. The prevalence rate of viola players was higher than violin players, and the prevalence rate of the bass players was higher than that of the cello players. In univariate analysis, job insecurity, irregular performance, stress from family problems, and performance related psychosomatic strains had a significant association with the prevalence rate of musculoskeletal disorders. In multiple logistic regression, job insecurity, irregular performance, and stress from family problems were significant variables affecting the prevalence rate of musculoskeletal disorders of instrument players.
CONCLUSIONS
This study suggest that symphony orchestra players are high risk group of musculoskeletal disorders. Irregular performance schedule and psychosocial stress including job insecurity, and psychosomatic strain were important risk factors of players musculoskeletal disorders. An exercise program such as stretching before and after performance, regular performance schedule and reduction of psychosocial stress might be helpful for prevention of musculoskeletal disorders of instrument players.

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The Effects of Self Stretching on Shoulder Pain and Shoulder Flexibility of Hospital Nurses
Eun-Ju Jeong, Young Ran Chae
Journal of Korean Biological Nursing Science.2012; 14(4): 268. CrossRef
Musculoskeletal Disorder Symptoms and Related Factors among Male Workers in Small-scale Manufacturing Industries
Seung-Hyun Lee, Ju-Yeon Lee, Young-Chae Cho
Journal of the Korea Academia-Industrial cooperation Society.2012; 13(9): 4025. CrossRef
Work-related Musculoskeletal Disorders among Agricultural Workers
Soo-Jin Lee, Hwan-Jin Park
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Risk Factors of Work-related Upper Extremity Musculoskeletal Disorders in Male Shipyard Workers: Structural Equation Model Analysis
Byung-Chan Park, Hae-Kwan Cheong, Eun-A Kim, Soo Geun Kim
Safety and Health at Work.2010; 1(2): 124. CrossRef

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Concentration of Lead, Cadmium, and Mercury in Scalp Hair, Cerebellum, Cerebrum, Heart, Kidney, Liver, Lung and Spleen from Autopsy Subjects : Relationship between Scalp Hair and Internal Organs: Jong Hak Chung, Chang Yoon Kim, Joon Sakong, Joong Jung Lee, Man Joong Jeon, Seong Kuk Lee, Jeung Sik Kwak, Sung Hwa Park; Korean Journal of Occupational and Environmental Medicine 1998;10(4):571-586. Published online December 31, 1998; DOI: https://doi.org/10.35371/kjoem.1998.10.4.571

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This study was conducted to measure the lead, cadmium and mercury levels in the scalp hair, cerebellum, cerebrum, heart, kidney, liver, lung, and spleen of the 60 Korean autopsy subjects and assess the relationship among those samples. The mean lead level in the scalp hair was 12.29+/-12.51 microgram/g and no significant difference was detected in lead concentrations between the two sexes. Among the internal organ tissues the cerebrum contained the highest level of lead. This is followed by the cerebellum, spleen and liver respectively. After which the kidney and lung showed a close similarity at relatively low concentrations and the heart contained the lowest concentration. There was also no significant variation found between sexes in a comparison of lead in the internal organ tissues. The concentrations of cadmium in kidney were 127.33+/-89.36 microgram/g and considerably higher than those in the other internal organs. The liver contained the next highest level of cadmium. In both sexes, the consistent difference was noted in the cadmium concentrations of the kidney, heart and spleen. Yet female cadmium level was higher than the male's. The concentrations of mercury in the kidney and liver were 1.26+/-2.89 microgram/g, 0.59+/-0.54 microgram/g and considerably higher than those in the other internal organs. The mean mercury level in the scalp hair was 1.29+/-0.64 microgram/g and no marked difference was noted in both sexes. The lead concentration in the spleen increased with advancing age, though not statistically significance, and most of the internal organ tissues that were examined showed no evidence of increased lead concentration with age. The kidney, cerebrum, spleen and cerebellum showed increased cadmium concentrations with age. Also as well as the internal organ tissues that were examined showed no evidence of increased mercury concentration with age. The lead concentrations in the liver and lung were higher in the urban area than in the rural area, but the lead concentration in the kidney was higher in the rural area. No difference was noted in tissue cadmium and mercury concentrations as to the area of residence either. The physical workers had greater concentrations of lead in cerebellum than did housewives or the unemployed. Yet no difference was noted in the other tissues between the two groups. In the cerebellum, cerebrum, heart, and spleen, the physical workers had greater concentrations of cadmium than students or mental workers. Also physical workers had greater concentrations of cadmium in lung than housewives or the unemployed. In contrast to lead and cadmium, both the housewives and the unemployed had higher concentrations of mercury in cerebellum and cerebrum than physical workers, but there was no difference was noted in the other tissues between the two groups. In the lead concentration, there was no statistically significant correlation between the scalp hair and examined internal organ tissues. There was a close relationship between lead levels in cerebellum and cerebrum (r=0.465, p<0.01), as well as a relationship between the cerebellum and the kidney(r=0.300, p<0.05). There was no statistically significant correlation between the cadmium levels in the scalp hair and in the examined internal organ tissues. Positive correlations were found between the cadmium concentrations in the cerebellum and the cerebrum(r=0.5543, p<0.01), heart(r=0.480, p<0.01), kidney(r=0.376, p<0.01) and spleen(r=0.408, p<0.01). Also positive correlation was found between in the cerebrum and the heart(r=0.377, p<0.01), kidney(r=0.484, p<0.01), liver(r=0.265, p<0.05), lung(r=0.458, p<0.01) and spleen (r=0.483, p<0.01). There was also no statistically significant correlation between the mercury levels in the scalp hair and in the examined internal organ tissues. Positive correlation was found between the mercury concentrations in the cerebellum and cerebrum(r=0.760, p<0.01), heart(r=0.270, p<0.05), liver(r=0.425, p<0.01), lung (r=0.488, p<0.01) and spleen (r=0.534, p<0.01), and also positive correlation was found between in the cerebrum and heart(r=0.376, p<0.01), liver(r=0.350, p<0.01), lung(r=0.554, p<0.01) and spleen (r=0.489, p<0.01). Various epidemiological studies reported usefulness and reliability of using scalp hair as a monitor of a environmental pollutants. In this study, there was statistically significant correlation of lead, cadmium and mercury levels in most of the tissues that were examined, but there was no statistically significant correlation between the lead, cadmium and mercury levels in the scalp hair and most of examined internal organ tissues. The findings of this study would suggest that it is still uncertain to using scalp hair as a biological monitoring.

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Human Exposure to Metals: Levels in Autopsy Tissues of Individuals Living Near a Hazardous Waste Incinerator
Montse Mari, Martí Nadal, Marta Schuhmacher, Eneko Barbería, Francisco García, José L. Domingo
Biological Trace Element Research.2014; 159(1-3): 15. CrossRef
Effect of metallothionein core promoter region polymorphism on cadmium, zinc and copper levels in autopsy kidney tissues from a Turkish population
Zeliha Kayaaltı, Görkem Mergen, Tülin Söylemezoğlu
Toxicology and Applied Pharmacology.2010; 245(2): 252. CrossRef

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The Effects of Job Stress on Psychosomatic Strain and Gastrointestinal symptom: Joon Sakong, Jong Hak Chung, Hea Suk Kim; Korean Journal of Occupational and Environmental Medicine 1997;9(3):530-542. Published online October 31, 1997; DOI: https://doi.org/10.35371/kjoem.1997.9.3.530

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No abstract available.

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Seafarers' perceptions of job demand: A cross-sectional study
Luisa Maria Roberta Tedesco, Pietro Ferrara, Lucia Stromillo, Antonio Arnese, Luciana Albano
Archives of Environmental & Occupational Health.2018; 73(5): 278. CrossRef
Relationship Between Job Stress and Turnover Intention Among Nurses in University Hospitals
Hyun-Ran Shin, Young-Chae Cho
Journal of the Korea Academia-Industrial cooperation Society.2013; 14(8): 3958. CrossRef
Relationship between Occupational Stress and Gastric Disease in Male Workers
Ho-Seob Lihm, Sang-Hyun Park, Eun-Hee Gong, Jong-Soon Choi, Jung-Won Kim
Korean Journal of Family Medicine.2012; 33(5): 311. CrossRef
Effects of Emotional Labor and Occupational Stress on Somatization in Nurses
Mee-Kyung Shin, Hyun Lim Kang
Journal of Korean Academy of Nursing Administration.2011; 17(2): 158. CrossRef

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ALDH2 Genetic Polymorphism and Urinary Hippuric Acid Concentration in Toluene Exposed Workers: Oh Choon Kwon, Ree Joo, Jung Jeung Lee, Chang Yoon Kim, Jong Hak Chung, Seong Yong Kim; Korean Journal of Occupational and Environmental Medicine 1997;9(2):332-340. Published online June 30, 1997; DOI: https://doi.org/10.35371/kjoem.1997.9.2.332

Abstract PDF: In this study we evaluated the effects of the genetic polymorphism of aldehyde dehydrogenase2 (ALDH2) on toluene metabolism and determined biological exposure indices (BEIs) for toluene by the genotypes of ALDH2. The study subject were 77 men workers who are handling toluene in a video tape manufacturing factory and a textile company. Through the face-to-face interview, the information about smoking and drinking behavior wag obtained. For determination of ALDH2 poly morphism, 5 ml of venous blood sample was obtained from each subject after informed consent. DNA was extracted from the buffy coat and ALDH2 genotyping were performed using a polymerase chain reaction (PCR) method. The genotype of ALDH2 was classified into the homozygous genotype of normal ALDH2 (NN), and the heterozygous genotype of normal and inactive ALDH2 (ND), and homozygous genotype of an inactive ALDH2(DD). The concentration of hippuric acid (HA), the main metabolite of toluene, was determined in urine specimens collected at the end of shift, corrected with creatinine (HA/C), and compared with BEI for toluene, which is 2.5 g/g creatinine. The personal exposure level of toluene were monitored, using personal air sampler and analyzed by gas chromatography. The frequencies of the three genotypes in this study subjects were, NN : 45 (58.4%), ND : 26 (33.8%) and DD : 6 (7.8%), and frequencies of the genotypes in the middle or heavy toluene exposure workers were not significantly different from those in the mild toluene exposure workers. The frequencies of the DD type of ALDH2 was lower among alcohol drinkers than among non-drinkers. The urinary HA concentration of DD group was significantly lower than that of the NN or ND group, which suggests that the HA formation from toluene decreased in DD group. Regression lines were used to estimate the BEIs of the NN, ND, and DD groups. NN : y = 0.0085x + 0.23, r = 0.90 ND : y = 0.0074x + 0.21, r = 0.85 DD : y = 0.0041x + 0.82, r = 0.83 The three regression lines revealed that the estimated urinary HA concentration of NN, ND, and DD groups at 377 mg/m3 toluene(TLV-TWA) exposure were 3.43, 3.00, and 2.37 g/g creatinine, respectively. The HA concentration of the NN, and ND group were higher than that of the ACGIH BEI (2.5 g/g creatinine) ; however, the HA level of DD group was lower than the BEI. These results suggests that the ACGIH BEI is not adequate to estimate the toluene exposure of the NN, ND and DD groups at the same time. Based upon those results, a new BEI for ALDH2 deficient workers may be necessary.

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Interrelation of Neuropsychiatric Symptom and Neurobehavioral Test among Workers Exposed to Organic Solvents: Joon Sakong, Jong Hak Chung, Hak Yong Lee; Korean Journal of Occupational and Environmental Medicine 1997;9(1):49-60. Published online February 28, 1997; DOI: https://doi.org/10.35371/kjoem.1997.9.1.49

Abstract PDF

A cross-sectional study of 118 car painters and controls of 113 workers was performed to investigate the interrelation between self-reported neuropsychiatric symptom and neurobehavioral performance using Scandinavian Questionnaire 16, Zung anxiety, depression scale and Swedish performance evaluation system (simple reaction time, symbol digit, digit span, finger tapping speed). The typical symptoms characteristic of painter's syndrome were not found and no significant association was found between solvent exposure and !total score of neuropsychiatric symptom but neurobehavioral performance of simple reaction time, symbol digit and digit span had association with solvent exposure. No significant associations were found between total score of neurotoxic symptom, anxiety scale, depression scale and the neurobehavioral performance. In factor analysis, the factor of questionnaire 16 measuring function of memory demonstrated no significant association with the factor of neurobehavioral test items measuring short term memory.

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Performance assessment on the Korean Computerized Neurobehavioral Test using a mobile device and a conventional computer: an experimental study
Young Seok Byun, Sung Kyu Park, Joon Sakong, Man Joong Jeon
Annals of Occupational and Environmental Medicine.2018;[Epub] CrossRef
Occupational Neurological Disorders in Korea
Eun-A Kim, Seong-Kyu Kang
Journal of Korean Medical Science.2010; 25(Suppl): S26. CrossRef
Usefulness of Color Vision Test for Early Detection of Neurological Damages by Neurotoxic Substances
Eun-Hee Lee, Kyungho Choi, Hong Jae Chae, Domyung Paek
Journal of Preventive Medicine and Public Health.2008; 41(6): 397. CrossRef

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The Effect of Day and Night Shift on Risk Factors of Cardiovascular Disease in Automobile: Manufacturing Plant Workers: Jae Haek Shin, Jung Jeung Lee, Kyeong Soo Lee, Joon Sakong, Chang Yoon Kim, Jong Hak Chung; Korean Journal of Occupational and Environmental Medicine 1995;7(1):28-45. Published online February 28, 1995; DOI: https://doi.org/10.35371/kjoem.1995.7.1.28

Abstract PDF: An investigation of effects of shift work on cardiovascular risk factors has been carried out on workers of a motor company in Ulsan, for 2 months from 20 April to 20 June,1993. This cross-sectional survey was designed to compare the shift workers (n=420) with day workers (n=88). The study subjects were drawn from workers who were employed in twelve hour shift system. A control group who never experienced shift work was drawn from different sections of the factory. Each worker completed a medical and occupational questionnaire and cardiovascular risk factors such as blood pressure, total cholesterol, triglyceride, apolipoprotein A-1 and B were measured. In univariate analysis, apolipoprotein B and the ratio of apolipoprotein B to apolipoprotem A-1 increased in shift workers. In multiple regression analysis for the systolic blood pressure, shift work was significant independent variable (p=0.059). In multiple regression analysis for the cholesterol, age and body mass index were significant independent variables(p<0.01), but shift work was not a statistically significant independent variable. In multiple regression analysis for the ratio of apolipoprotein B to apolipoprotein A-1, shift work was significant independent variable (p<0.05). Shift workers who have engaged in shift work more than 5 years have an excess of total cholesterol, apolipoprotein B and ratio of apolipoprotein B to apolipoprotein A-1 than those who have engaged in shift work less than 5 years (p<0.05). In multiple regression analysis for the cholesterol, duration of shift work was a significant independent variable (p=0.012). In multiple regression analysis for the apolipoprotein B and ratio of apolipoprotein B to apolipoprotein A-1, duration of shift work was not a significant independent variable.

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A Computer-Administered Neurobehavioral Evaluation of Workers Exposed to Organic Solvents: Jong Hak Chung, Chang Yoon Kim, Joon Sakong; Korean Journal of Occupational and Environmental Medicine 1994;6(2):219-241. Published online September 30, 1994; DOI: https://doi.org/10.35371/kjoem.1994.6.2.219

Abstract PDF

A cross-sectional study was performed to evaluate the effects of chronic exposure to solvent on neurobehavioral performance of solvent exposed 89 workers engaged in a video tape manufacturing fatory. A control group of 43 workers was selected fro different sections of the factory. The mean age and the mean duration of employment were 29 years and 5.4 years. Each workers completed a medical and occupational questionnaire. Adverse effects on the central nervous system were assessed by self reported Scandinavian questionnaire 16, New Anxiety-Depression Scale and seven test of Swedish Performance Evaluation System. These included simple reaction time, choice reaction time, digit classification, finger tapping speed, additions, symbol digit and digit span. Several potential confounding factors were included as indepedent variables in all analysis of neurobehavioral tests and symptoms. These included age, sex, educational level, familiarity with computer, alcohol drinking and amount of smoking. No significant associations were found between solvent exposure and total symptom score and mood score, Although the mean duration of employment was 5.4 years, comparison of mean performance scores adjusted for confounding factors showed a significantly poorer performance on choice reaction time(p<0.05), digit classification (p<0.01), additions (p<0.01) and symbol digit(p<0.01) in exposed group. Factor matrix of neurobehavioral tests produced by varimax rotation showed three distinct factors, which correspond to assessments of "memory", "coordination" and "response speed". These factors accounted for 62.6% of the total variance of the sample. Familiarity with computer was found to be associated with performance of symbol digit and amount of smoking appeared to slow finger tapping speed. Male and college graduate workers have less errors than others. There were no significant correlation between neurotoxic symptom score and performance of neurobehavioral tests.

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Minkeun Kim, Chulyong Park, Joon Sakong, Shinhee Ye, So young Son, Kiook Baek
Annals of Occupational and Environmental Medicine.2023;[Epub] CrossRef
Effects of computer familiarity and computer type on the performance of Korean computerized neurobehavioral test
Nak Joon Baek, Gun Il Park, Young Seok Byun, Man Joong Jeon, Joon Sakong
Annals of Occupational and Environmental Medicine.2016;[Epub] CrossRef
Test/re-test Reliability of the CANTAB Batteries to Evaluate the Neuropsychological Function for Korean Adult
Eui-Young kim, 조은형
The Korean Journal of Measurement and Evaluation in Physical Education and Sports Science.2012; 14(1): 11. CrossRef
Occupational Neurological Disorders in Korea
Eun-A Kim, Seong-Kyu Kang
Journal of Korean Medical Science.2010; 25(Suppl): S26. CrossRef
Neurobehavioral Changes of Shipyard Painters Exposed to Mixed Organic Solvents
Choong Ryeol LEE, Kyoung Sook JEONG, Yangho KIM, Cheol In YOO, Ji Ho LEE, Young Hee CHOI
INDUSTRIAL HEALTH.2005; 43(2): 320. CrossRef

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