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The Correlation of Aerobic Exercise on Lymphocytes Phonotypes and VO2
김태우,민진아 한국스포츠리서치 2007 한국 스포츠 리서치 Vol.18 No.5
유산소운동이 T-Lymphocytes Phonotypes와 최대산소섭취량(VO2max)의 상관분석김태우(유타주립대학교 군사전술학과) 민진아(경북대학교 체육학과)T-lymphocytes는 인체에 주로 림프조직에서 분비되며, 체액성 및 세포매개성 면역에 관여하는 중요한 면역세포이다. 본 연구는 유산소성운동이 T-lymphocytes phonotypes(발현형)에 미치는 영향에 관해 알아보고자 하였다. 실험 설계는 34명의 성인남자들을 대상으로 Exercise group 17명과 Control group 17명 분리하였다. 우선 Exercise group은 10주 동안 (운동강도;70-80% VO2max)에서 준비운동을 cycle ergometry 이용하여 하루에 1일 45분 동안 운동 후, predicted maximum heart rate(PMHR; 220 minus each subjects age), 최대산소섭취량에 도달하기 전에 운동 끝내는 최대하 운동(Submaximal Exercise)을 220분 운동을 시켰다. Control group은 exercise group과 같은 환경과 여건에서 전혀 운동을 시키지 않고, 10주간의 최대하 운동이 끝난 후, 10주간의 각각의 Exercise group의 운동 전, 후, Control group,의 정맥(IV)혈액을 비교분석 하였다, 그리고 연구의 객관성을 확보하고자 SDS-polyacrylamide gel electrophoresis(SDS-PAGE)를 사용하여 비교 분석하였다. 연구결과 Exercise group의 T-lymphocytes phonotypes; CD2(p<.01), CD45RA+CD+(p<.01), CD8+(p<.01), CD4+CD8+(p<.01), CD20(p<.01)등이 상관분석 결과 개입수준의 주효과만이 유의한 것으로 나타났다. 또한 최대산소섭취량이 (VO2max)증가된 Exercise group의 Lymphocytes(%), Monocytes(%), 및 T-lymphocytes phonotypes가 유의하게 (p<.01), (p<.05) 및 (p<.01)증가된 것으로 보아서 면역세포도 산소의존 기전(Oxygen Dependent Mechanism)의 가동 능력 증가에 영향을 미치는 것으로 생각되어진다.
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택배 배송 트럭의 적재함 높이에 따른 인간공학적 작업 부하 분석
김태우,정명철,박정근,모승민 대한인간공학회 2025 대한인간공학회지 Vol.44 No.1
Objective: The purpose of this study is to ergonomically analyze the workload associated with the roof-height of the cargo area in delivery trucks, targeting courier workers operating in logistics terminals. Background: To promote ground-level park development in apartment complexes as part of efforts to improve residential environments and address traffic safety issues, restrictions are being placed on the entry of delivery trucks based on the roof-height of their cargo areas. Method: A total of 18 industrial male workers participated in the experiment (highroof: 9, low-roof: 9). This study considered four independent variables: roof-height (high, low), task (loading, organizing, unloading), work timing (before work, after work), and body parts (neck, shoulder, lower back, knee, whole body). The objective dependent variable, rapid entire body assessment (REBA) score, was analyzed, and the subjective discomfort was assessed using visual analogue scale (VAS) to evaluate perceived discomfort. The entire body movements of the subjects were continuously recorded using a compact camcorder. Before and after the tasks, subjective discomfort in each body part was assessed using a questionnaire. To statistically analyze the significant differences according to the experimental design, a repeated measures ANOVA was performed. Results: The ANOVA results for the REBA score showed statistically significant differences, with the main effects (roof height: p=0.007, task: p<0.000) and interaction effect (p<0.000). The mean REBA score showed a significantly higher risk for low-roof height compared to high-roof height. The REBA scores for the tasks of organizing and unloading were significantly higher in the low-roof height. The ANOVA results for the subjective discomfort showed statistically significant differences, with all main effects (roof height: p<0.000, task: p=0.001, body part: p<0.000, work timing: p=0.003) and the two-way interaction effect between roof height and work timing (p=0.003). The mean subjective discomfort in the lower back, overall body, and knee was found to be significantly higher. In low-roof height, the mean subjective discomfort significantly increased after work compared to before work. Conclusion: Low-roof vehicles repeatedly expose workers to bending and crouching postures, leading to a high risk of musculoskeletal disorders and increased subjective discomfort, emphasizing the urgent need for ergonomic improvements. Application: Based on the findings of this study, ergonomic improvements for lowroof vehicles are suggested, which are expected to reduce the physical workload.
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김태우,이강운 한국동물분류학회 2019 Animal Systematics, Evolution and Diversity Vol.35 No.3
The bamboo katydid, Palaeoagraecia lutea (Matsumura et Shiraki, 1908) is newly reported in South Korea. Previously, the species was only known in Japan, but currently its occurrence is confirmed in the far southern locality of Hampyeong, Jeollanam-do province of Korean Peninsula. This katydid was collected using a light trap and sound tracing in the bamboo forest. It is regarded as a rare stenotopic species. The features of male Palaeoagraecia lutea are illustrated and discussed in terms of song characteristics, and a key is provided for the genus Palaeoagraecia. A new synonym is proposed: P. philippina (Karny, 1926)=P. globicerata (Vickery et Kevan, 1999) syn. nov.
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