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오기욱 ( Ki-wook Oh ),설진곤 ( Jin-gon Sul ) 국군의무사령부 2012 대한군진의학학술지 Vol.43 No.1
가속도 내성 훈련 시 발생하는 Gravity induced loss of consciousness (G-LOC)은 다양한 요인에 의하여 영향 받을 수 있다. 이번 연구의 목적은 가속도 훈련 중 발생하는 G-LOC에 미치는 육체적 생리적 요인을 분석하여 G-LOC 발생의 예측 요인을 발견하는 것이다. 연구 결과로 G-LOC의 발생과 관련된 인자로 항G복의 착용유무, anti-gravity straining maneuver, 커피 섭취 유무, 자율신경계 특히 부교감신경의 활성도와 연관이 있었다. 따라서 G-LOC을 예방하기 위하여 자율신경계 활성과의 연관성에 관한 연구가 필요할 것이다. Objectives : Previous studies indicate that 8-13% of pilots have experienced G-induced loss of consciousness (G-LOC). Due to altered state of awareness and relative incapacitation time, G-LOC is one of the most serious threats to aircrews flying in high-performance fighter aircrafts. Demographic factors, lifestyles, physiological factors and flying factors may be determinant risk factors for G-LOC. In this study, we investigated the factors associated with G tolerance. Methods : Data were collected by interviewing 122 fighter aircraft pilots and requesting information on visual symptoms and G-LOC-associated symptoms. They underwent high-G training at the Aerospace Medical Center, ROKAF. Details regarding demographic factors, lifestyles, physiologic factors and flying factors were performed. Heart rate variability was examined in 42 pilots at sitting rest before high-G training. Results : Of the 122 pilots, 11.4% had experienced at G-LOC in the high G environment. Multiple regression analyses yielded that G-LOC was inversely correlated with anti-G suit, anti-G straining maneuver (AGSM) and intake of coffee. There was a significant increase in Lf/Hf associated with G-LOC as compared with G exposures without symptoms. Conclusion : These findings indicate that fighter pilots are experiencing a similar rate of G-LOC when compared with previous studies. AGSM, G-suit, coffee intake and autonomic activity are determinants of G tolerance.
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권민수 ( Min-soo Kwon ),정수영 ( Soo-young Chung ),설창안 ( Chang-ahn Seol ),설진곤 ( Jin-gon Sul ) 국군의무사령부 2011 대한군진의학학술지 Vol.42 No.1
In the present study, we examined the change of pain behaviors induced by formalin injected subcutaneously (s.c.) into the hind paw, or substance P (SP) and glutamate injected intrathecally (i.t.) in the mouse immobilization stress model. The mouse was restrained either once for 1 h or five times for 5 days (once/day). In the formalin test, a single immobilization stress attenuated pain behaviors (licking, biting or scratching) in the second phase, while it had no effect on the pain behaviors revealed during the first phase. In addition, repeated immobilization stress attenuated pain behaviors revealed during the second phase but not in the first phase. A single as well as repeated immobilization stress decreased pain behaviors induced by substance P i.t. injection, but there were no significant changes in the glutamate test. These results suggest that a single and repeated immobilization stress differentially affects such nociceptive processing induced by formalin, SP, glutamate and pro-inflammatory cytokines in different manners.
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최대 산소소모량 평가에 있어서 자전거 에르고미터를 이용한 최대하부하검사방법의 타당도
강동묵 ( Dong Mug Kang ),박용균 ( Yong Kyun Park ),이용환 ( Yong Hwan Lee ),설진곤 ( Jin Gon Sul ) 한국산업위생학회 2006 한국산업보건학회지 Vol.16 No.2
Because of the limitations of maximal load tests for VO2max, submaximal tests using cycle ergometer are used for field study in general. This study was conducted to evaluate validity of various submaximal tests using cycle ergometer. This study had been conducted during May to June 2005, which subjects were 15 males and 15 females in twenties. Experiment was performed with restrictive conditions which regulated ambient temperature, noise, and entrance restriction. Submaximal load test protocols including YMCA Protocol (YP), Astrand-Rhyming Protocol (ARP), Relative heart ratio Protocol (RP), and Ramp test Protocol (RP) were compared with maximal load test which used gas mask analyser using Bruce Protocol. All submaximal load tests were highly related with maximal load test (Spearman`s correlation coefficient>0.60) with statistical significancy. The highest correlation coefficient with maximal test was found in RP. Three submaximal test results except RP were significantly different with maximal test results (Wilcoxon rank test). All submaximal tests had high validity. The reason why RP had highest validity might be that it represents Korean physical strength and individual differences better than the others. RP using cycle ergometer would make easy to study for physical capacity evaluation and field workload estimation.
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우리나라 특수건강진단 대상물질에 대한 6개 기관의 직업적 노출 기준 비교
이상윤 ( Sang Yoon Lee ),서춘희 ( Chun Hui Suh ),김세영 ( Se Yeong Kim ),예병진 ( Byeong Jin Ye ),설진곤 ( Jin Gon Sul ),손준석 ( Jun Seok Son ),윤종완 ( Jong Wan Yoon ),홍석우 ( Suk Woo Hong ),류지영 ( Ji Young Ryu ),김대환 ( Dae 한국산업위생학회 2013 한국산업보건학회지 Vol.23 No.2
Objectives: This study was performed in order to compare the average levels and similarity of occupational exposure limits in South Korea, the U.S., the E.U., Germany, Japan and Finland. Methods: In this study, occupational exposure limits (OELs) for one hundred and seventy seven hazardous substances which are managed in the workplace by the Occupational Safety and Health Act in South Korea were matched with those of other countries. The units for the exposure limits of the same substance (identical CAS number) were unified and the exposure limits in each country were compared with threshold limit values (TLVs) of the American Conference of Governmental Industrial Hygienists (ACGIH) using a geometric mean method. Geometric similarity was calculated to assess the association by each country. Results: The exposure limits according to ACGIH TLVs in South Korea, the E.U., Germany, Japan, and Finland were 148, 37, 76, 90, and 110, respectively. When using TLVs of ACGIH as a standard, the geometric mean ratios of Germany, Finland, the E.U., South Korea, and Japan were 0.79, 0.80, 0.82, 1.19, and 1.27, respectively. Geometric similarity with TLVs of ACGIH was highest in South Korea (0.75) followed by Japan (0.56), the E.U. (0.52), Finland (0.50), and Germany (0.46). Conclusions: Through the comparison of levels of OELs and similarities among South Korea, the U.S., the E.U., Germany, Japan, and Finland, we could better understand the characteristics of occupational exposure limits by countr
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