고지대 훈련이 수영선수의 흡기근 및 경기력에 미치는 영향

지창진(Ji, Chang-Jin),박종석(Park, Jong-Suk),김상호(Kim, Sang-Ho) 한국사회체육학회 2015 한국사회체육학회지 Vol.0 No.62

The purpose of this study was to determine the effects of altitude training on inspiratory muscle and swimming performance of swimmers in the Korea national team. Twelve swimmers were participated for this study. All subjects were measured maximum inspiratory capacity, inspiratory endurance and swimming record before altitude training, and were trained at Kunming in China during three weeks. After altitude training, all subjects were recalibrated maximum inspiratory capacity, inspiratory endurance, swimming record. The results of this study were as follows; The peak s_index, peak flow, avg. inspiratory power, total energy, swimming record had significantly increased. Thus, altitude training improves inspiratory muscle and swimming performance, and it would be desirable to enter a competition in the first week after altitude training.

한국인의 신체 활동시간, 생활양식의 요인이 만성질환에 미치는 영향

지창진(Ji Chang-Jin),김상호(Kim Sang-Ho),윤광한(Yun Gwang-Han) 대한치료과학회 2019 대한치료과학회지 Vol.11 No.2

Objective: The lack of physical activity(PA) is one of the top ten causes of death. In the current era of South Koreas more to aging, the death rate, and medical expenses are rising along with the lack of physical activity. This study reveals the relationship of medical expenses with hours spent on physical activity and sitting time. Moreover, provides a guide to reasonable lifestyles. Method: To examine the factors related to the PA of adults, this study used data collected from 2011 to 2013 of Korean Medical Panel Data. Results: In Combined factor; First, observed the risk of Chronic Disease(CD) prevalence, compared with high PA & low sitting group, low PA & Low sitting group was significantly increased by 1.12 times. Complex CD(CCD), compared with high PA & low sitting group, low PA & Low sitting group was significantly increased by 1.19 times. Individual factors; Second, CD Compared with the sitting time of <29(hours/week, h/w), 29-41(h/w), 42-55(h/w), and >55(h/w) was significantly increased by 1.12 times, 1.10 times, and 1.10 tims, respectively. CCD, compared with the sitting time of <29(h/w), 29-41(h/w), 42-55(h/w), and >55(h/w) was significantly increased by 1.28 times, 1.18 times, and 1.16 times, respectively. Third, CD Moderate MET was significantly increased by 1.18 times compared with high MET. CCD Moderate MET was significantly increased by 1.13 times compared with high MET. Conclusions: It is expected to reduce chronic disease growth if supported by various programs that cut off sedentary life along often with increased PA in public health policies.

연령대별 복합요인과 신체활동량의 변화가 만성질환의 수준과 의료비에 미치는 영향

지창진(Chang-Jin Ji) 대한고령친화산업학회 2023 대한고령친화산업학회지 Vol.15 No.2

연구목적 본 연구에서 4년 동안 연령대별 신체활동량 변화에 따른 의료비용 개연성을 살펴보고 해당 연구결과를 토대로 만성질환 패턴을 분석하고자 한다. 특정 연령대의 질환 발생을 예방하기 위한 정책 수립과 함께 만성질환 개선 사례와 생활습관의 관련성을 고찰하여 의료 정책 개발에 적용될 수 있는 대안을 제시하고자 한다. 연구방법 한국의료 패널데이터 ver. 1.71 를 활용하여 각각의 연령대별로 만성질환 위험도 및 의료비지출을 확인하기 위해 4년동안 설문지에 참여한 인원(7,184명)을 데이터 추출 후 종단 연구 분석을 실시하였다. 연령대별 신체활동량과 좌업 시간의 개별요인에 대해 기술 통계를 t-test 와 one-way ANOVA를 실시하였으며, 만성질환별 위험도를 살펴보기 위해 복합 요인들은 1분위(“High PA, Low Sit”,기준변수)와 비교하여, 2분위(High PA, High Sit), 3분위(Low PA, Low Sit), 4분위(Low Sit, High PA)에 따른 로지스틱회귀분석을 실시하였다. 연구결과 첫째, 장년층과 노년층 신체활동량은 정상그룹에 비해 단순만성질환에서 복합만성질환으로 갈수록 감소하였으며, 노년층은 의료비지출 평균이상 그룹에서 신체활동량 감소가 나타났다. 둘째, 노년층 좌업 시간은 정상그룹에 비해 단순만성질환에서 복합만성질환으로 갈수록 증가하였다. 셋째, 복합요인(신체활동과 좌업 시간)에서 고혈압과 당뇨병 위험도는 저위험군(1분위)에 비해 고위험군(4분위)에서 상승하였으며, 뇌혈관 질환 위험도는 저위험군(1분위)에 비해 좌업 시간이 높은 그룹(2분위,4분위)에서 상승하는 것이 나타났다. 심장질환 위험도는 저위험군에 비해 모든 그룹(2분위,3분위,4분위)에서 위험도가 상승이 나타났다. 결론 데이터 기반한 치료의학과 함께 예방의학 차원의 접근(운동처방 및 관리를 위한 지역별 전문기관 선정을 통한 네트워크 신체활동 프로그램)이 필요하다. 장년층 세대부터는 의료비 감소를 위해 선제적 만성질환 추적 플랫폼 시스템 개발 및 구축을 고민해야 할 시점이라 생각된다. Objective : The purpose of this study was to confirm the relationship between the disease degree and the lifestyle in the cases. Methods : Using Korean Health Panel Survey Data ver. 1.71 to determine the risk of chronic disease by age group, the complex factors, longitudinal study analysis was conducted for the data was extracted from the participants who participated in the 4 years questionnaire(n=7,184). Results : First, Age(50-64) and Age(over 65) group PA decreased from simple chronic disease to complex chronic disease compared to the normal group. Age(over 65) showed PA decrease in the group above the average medical expenditure. Second, compared to the normal group, the Sit time of the elderly increased from simple chronic disease to complex chronic disease. Third, in complex factor the risk increased of Hypertension and Diabetes odds in the high-risk group compared to the low-risk group, and the risk of Cerebrovascular Disease odds in the high sit grop compared to the low-risk group. Cardiovascular risk increased in all groups compared to low-risk group. Conclusion : Along with data-based therapeutic medicine, a preventive medicine-level approach is needed.

다물체 동역학 모델을 이용한 밸런싱 방법에 관한 연구

지창진(Chang-Jin Ji),유태규(Tae-Gyu Yu),홍성욱(Seong-Wook Hong) 한국생산제조학회 2008 한국생산제조시스템학회 학술발표대회 논문집 Vol.2008 No.5

Aysmmetric rotors are often employed in a variety of machines. A large amount of asymmetry in rotors makes the conventional balancing schemes very difficult in implementation. In this paper, a balancing scheme which systematically adjusts principal inertial axes by adding balancing weights is applied. A multi-body dynamic model using commercial codes, ADAMS and SIMULINK, is developed to prove the effect of balancing in a heavily unbalanced rotor.

진동수에 따른 전신진동운동이 하지근 파워 및 점프 수행력에 미치는 영향

윤광한(Gwang Han Yun),지창진(Chang Jin Ji),박종석(Jong Suk Park),임용택(Yong Taek Im),황문현(Moon Hyun Hwang),김상호(Sang Ho Kim) 한국사회체육학회 2014 한국사회체육학회지 Vol.0 No.56

The purpose of this study was to verify the differences on power generation of lower limb and the optimum frequency to maximize the power. The subject of this study was chosen as 10 able-bodied male students in college on N university, Chungcheongnam-do, whom there is no medical history about motor disturbance, paresthesia, nervous system, musculoskeletal system, and listened about the purposes, methods and risks of study, and written the participation agreement. Using random sampling method, 10 subjects kept an upright posture on the Turbo-Trainer during 5 minutes as the frequency of 8㎐, 26㎐, 40㎐ in order to fit each order, and then practiced 5 times multiple jump on the Accupower for measuring the lower limb power, finally measured maximum power, mean power, maximum jump height and mean jump height through the ground reaction force. Using SPSS 18.0, the data process of this study calculated as mean (M) and standard deviation (SD) of all measured value, used one-way repeated measure ANOVA in order to verify the significant difference between maximum power, mean power, maximum jump height, mean jump height at each frequency. The significant level of hypothesis verification is set-up as α=.05. The results of this study are follows. 1) The maximum power of whole body vibration showed significant differences at the 26㎐ only compared with before implementation(p <.01). 2) The mean power of whole body vibration showed significant differences at the 26㎐ only compared with before implementation(p<.05). 3) The maximum jump height of whole body vibration showed significant differences at the 26㎐ only compared with before implementation(p<.05). 4) The mean jump height of whole body vibration showed significant differences at the 26㎐ only compared with before implementation(p<.05). In summary, during whole body vibration according to frequency affect to lower limb power at 26㎐, the optimum frequency except mean jump height has verified at 26㎐ due to the significant difference has been appeared at the maximum power, mean power, maximum jump height except mean jump height. Therefore, this study is provided to sports scientist, supervisor, coach, trainer and player whom need the enhancement of lower limb power as scientific basic data and will be contributed to their performance enhancement.

다물체 동역학 모델을 이용한 밸런싱 방법에 관한 연구

지창진,유태규,홍성욱 한국공작기계학회 2008 한국공작기계학회 춘계학술대회논문집 Vol.2008 No.-

Aysmmetric rotors are often employed in a variety of machines. A large amount of asymmetry in rotors makes the conventional balancing schemes very difficult in implementation. In this paper, a balancing scheme which systematically adjusts principal inertial axes by adding balancing weights is applied. A multi-body dynamic model using commercial codes, ADAMS and SIMULINK, is developed to prove the effect of balancing in a heavily unbalanced rotor.