비만 쥐의 체중감량방법에 따른 시상하부의 Leptin, LRb, 염증인자 및 BDNF mRNA 발현량에 대한 연구

김재호(Kim, Jae-Ho),신정엽(Shin, Jeong-Yeop),최재일(Choi, Jae-IL) 한국체육과학회 2016 한국체육과학회지 Vol.25 No.3

This study was conducted to investigate the effects of method of weight loss on expression of Leptin, leptin receptor b, inflammatory factors and BDNF mRNA in hypothalamus of obese mouse and the relationships between them. Obesity was induced in C57BL/6 male mice (n=60) by high-fat diet, which were divided into six experimental groups, control group (CG), high-fat diet group (HDG), normal diet group (NDG), normal diet and aerobic exercise group (NDEG), calorie restriction group (CRG), calorie restriction and aerobic exercise group (CREG). Calorie restriction and/or aerobic exercise of 12 weeks were treated, and as a result of analysis of dependent variables, the following conclusion was induced. After completion of experiment, CREG was shown to be effective in weight reduction compared with other groups. Also, as manifestation of BDNF and IL-6 in the hypothalamus was shown significantly higher compared with other groups. the affirmative effect in synaptic transmission of signal related to appetite suppression and energy consumption by increase of BDNF and IL-6 in the hypothalamus due to aerobic exercise was confirmed. On the contrary, although, in HDG, concentration of serum leptin was shown significantly higher than all the other groups, and as leptin, LRb expression levels in the hypothalamus were shown significantly lower, leptin resistance may be confirmed. As a result, by adjusting LRb and expression by BDNF, IL-6 in the hypothalamus as reaction to aerobic exercise and calorie restriction in treatment with leptin resistance in obesity, the effect of weight reduction was confirmed.

비만 쥐의 식이제한과 유산소운동이 시상하부의 염증, 식욕억제 Neuropeptide 및 하루식이섭취량에 미치는 영향

박상용(Park, Sang-Yong),전용균(Jeon, Yong-Kyun),최재일(Choi, Jae-Il) 한국체육과학회 2017 한국체육과학회지 Vol.26 No.1

This study was conducted to investigate the effects of calorie restriction and aerobic exercise on expression of appetite suppression neuropeptide, inflammation factors in hypothalamus and daily feed intake of obese mouse. Obesity was induced in C57BL/6 male mice (n=60) by high-fat diet, which were divided into six experimental groups, control group (CG), high-fat diet group (HDG), normal diet group (NDG), normal diet and aerobic exercise group (NDEG), calorie restriction group (CRG), calorie restriction and aerobic exercise group (CREG). Calorie restriction and/or aerobic exercise of 12 weeks were treated, and as a result of analysis of dependent variables, the following conclusion was induced. After completion of experiment, CREG was shown to be effective in weight reduction compared with other groups. and average daily feed intake was shown less after completion of experiment than high-fat diet group (HDG), normal diet group (NDG) and calorie restriction group (CRG). Also, as manifestation of IL-6 in the hypothalamus was shown significantly higher compared with other groups. the affirmative effect in synaptic transmission of signal related to appetite suppression and energy consumption by increase of IL-6 in the hypothalamus due to aerobic exercise was confirmed. On the contrary, although, in HDG, concentration of leptin expression levels in the hypothalamus were shown significantly lower, leptin resistance may be confirmed. and TNF-α expression level was shown significantly more than other groups. As a result, by IL-6 in the hypothalamus as reaction to aerobic exercise and calorie restriction in treatment with leptin resistance in obesity, the effect of weight reduction was confirmed.

여자프로골퍼의 스포츠 상해 분석

최재일(Choi Jae-Il),정구영(Jung Goo-Young) 한국체육과학회 2008 한국체육과학회지 Vol.17 No.4

The purpose of this study was to investigate the research injuries in KLPGA golf athletes. KLPGA golfers were randomly assigned to two group; (a) excellence players (b) general players Result of this study were as follows, (1) Sports injuries types and diagnosis of professional Golfers. (2) Sports injuries types and diagnosis to Game First, there were in practice(55.8%), in field(31.0%), in game(2.5%) of resulting injury time. Second, there were driver shot(40.1%), wood shot(26.4%), long-iron shot(24.9%), middle-iron shot(6.1%), short-iron shot(2.5%) of resulting injury movements. Third, there were self-treatment(16.2%), a coach(42.6%), a doctor(22.8%), a colleague of resulting emergency needs Fourth, there were 1-5 days(34.7%), 6-10 days(13.7%), 11-15 days(13.7%), 16-20 days(7.4%), more 30 days(22.1%) medical treatment period.

아침 유산소운동에 따른 중학생의 BDNF와 작업기억력 변화에 대한 연구

최재일(Choi, Jae-Il),김재호(Kim, Jae-Ho),전용균(Jeon, Yong-Kyun),조원제(Cho, Won-Je) 한국체육과학회 2012 한국체육과학회지 Vol.21 No.4

The purpose of this study was to define that the effect of morning aerobic exercise on the expression of BDNF and working memory in middle-school Students. The subjects were thirty middle schoolers of 15 years-old age whose cohorts were divided into morning aerobic exercise group (MAEG, n=15) and control group (CG, n=15). Frequency of the aerobic exercise was four times a week for 8 weeks. To be equal to the workload of the exercise, the customized morning aerobic exercise was set up for 200㎉ consumption of each individual by formula. Blood samples and working memory data was collected before and after the experiment, the conclusion as follows: 1. The expression of BDNF showed a significant increase of 5028.26pg/㎖ from 24577.00±5931.32pg/㎖ to 28605.26±8116.53pg/㎖ (p<.001), 2. The working memory showed a significant increase of 4.67 from 19.33±2.69 to 24.00±4.03 (p<.000) 3. The expression of BDNF between two cohorts was not significant after the aerobic exercise but the working memory showed a significant (p<.004) between MAEG and CG. The result of this study explained that morning aerobic exercise was positive for the expression of BDNF and working memory in the middle-school students.

트레드밀에서의 Rockport 걷기검사를 통해 예측된 VO₂max의 타당도 검증을 위한 연구

최재일(Choi, Jae-Il),김재호(Kim, Jae-Ho),전용균(Jeon, Yong-Kyun),신정엽(Shin, Jeong-Yeop) 한국웰니스학회 2020 한국웰니스학회지 Vol.15 No.3

이 연구는 트레드밀 에서의 Rockport 1 mile 걷기검사를 통해 예측된 최대산소섭취량의 타당도를 검증하기 위한 연구로 실시되었다. 연구대상자는 최대운동부하 검사를 필요로 하기에 안전을 위해 20~50세 남성 20명으로 임상적으로 특별한 질환이 없고, 규칙적인 운동경험이 없으며, 체지방율이 25% 이하인 대상자로 선정하였다. Rockport 1 mile 걷기검사를 위한 트레드밀은 Rockport 걷기검사 예측식을 탑재한 (주)헬스원의 트레드밀 장비(HERA 9000pro, KOREA)를 활용하였다. 또한 모든 대상자들은 최대산소섭취량을 직접측정하기 위해 Bruce’s protocol를 통한 점증적 운동부하검사를 실시하였다. 직접검사(준거)에 대한 트레드밀에서의 Rockport 1 mile 걷기검사(예측)의 오차율은 5.43%로 나타났고, 급내상관계수(ICC)는 R=.881로 타당한 결과를 나타냈다. 추후 많은 대상자를 통해 트레드밀에서 Rockport 걷기검사 시 예측된 VO₂max 타당도를 검증하기 위한 연구가 필요하다고 판단된다. This study was conducted to verify the validity of the predicted maximum oxygen intake through Rockport 1 mile walking test in treadmill. Twenty men aged 20 to 50 years were selected as subjects with no clinically specific disease, no exercise experience, and a body fat percentage of 25% or less for safety purpose as this study requires maximum exercise test. The treadmill for the Rockport 1 mile walking test utilized a HealthOne treadmill device (HERA 9000pro, KOREA) equipped with the Rockport walking test prediction equation. In addition, all subjects performed an incremental maximum exercise test through Bruce"s protocol to measure the VO₂.max. The error percentage of the Rockport 1 mile walking test (prediction) on the treadmill for the direct test (reference) was 5.43%, and the ICC(intraclass correlation coefficient) was R=.881. It is considered that a study is needed to verify the validity of the predicted VO₂max when testing the Rockport on a treadmill through a large number of subjects.

미세관망을 이용한 주파수 선택적 투과막이 결합된 복합재의 기계적 특성 연구

최재일(Choi Jae Il),홍익표(Hong Ic Pyo),박용배(Park Yong Bae),김윤재(Kim Yoon Jae),전흥재(Chun Heoung-Jae) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11

시계열 분석에 의한 한국 프로축구 관중수 예측(2009-2015)

최재일(Jae Il Choi),정용락(Yong Rak Chung) 한국사회체육학회 2010 한국사회체육학회지 Vol.0 No.39

The spectators` prediction of the korean professional soccer has meaning the financial policy making, allots a budget of association or team. It is important a task because it will be able to apply with baseline data. So this research predicts the spectators` prediction of the korean professional soccer until 2015. Specially, ARIMA models of time series analysis is better short-term prediction in the demand forecast technique. To examine spectators` prediction, it used the data what provides from the data of a morgue of soccer world home page. Namely, the first analysis started to select an ARIMA model by a basic process of model set. And the result which predicts spectators by the estimation process of a parameter, forecast index for 7 year has shown the increasing pattern. Or spectators break through 400million since 2011. Like this result, the problem (a selection of independence variable or of trend analysis of some data) which is presented from statistical technique of demand forecast in past will be able to overcome. Therefore scientific prediction model make an accurate estimate spectators by high reliability. But the prediction index must recognize the fact which affected a previous year spectators. The official organizations are always interested in the spectators` inflow.

저항성 트레이닝 방법에 따른 고등학교 씨름선수들의 무릎관절 최대근력 발현시간 및 지속시간의 변화

최재일(Choi, Jae-Il),김재호(Kim, Jae-Ho),고영준(Ko, Young-Jun) 한국체육과학회 2016 한국체육과학회지 Vol.25 No.5

The purpose of this study was to define the most effective method in order for Ssireum players to improve time to peak toque and time peak toque held on the knee joint. The participants were 18 high school students, who were divided into 2 groups: weight training(WTG; n=9), plyometric training(PTG; n=9). Frequency of the training was four times a week for 12 weeks. Time to peak torque of right extensors was significantly more increased in PTG than WTG. And time to peak torque of left extensors was significantly increased in PTG. Time to peak torque of right and left flexors was significantly increased in PTG and WTG. And time peak toque held of right and left extensors was significantly more increased in PTG than WTG. These results indicate that PTG was good for the time to peak toque and time peak toque held on the knee joint in the Ssireum players.

엔터테인먼트 로봇의 감성 알고리즘 연구

최재일(Jae-Il Choi),김승우(Seung-Woo Kim) 대한전기학회 2002 대한전기학회 학술대회 논문집 Vol.2002 No.11

골프장의 관계효익이 고객유지에 미치는 영향

최재일(Choi, Jae-Il),이준우(Lee, Jun-Woo) 한국체육과학회 2018 한국체육과학회지 Vol.27 No.5

On the basis of the principle that benefits to corporations such as customer retention and profit creation can be realized through relationship management with golf course customers, the following conclusions were drawn after analyzing the effect of customer relationship benefit on customer retention as well as on the difference of relationship benefit on customer retention depending on customer’s gender. First, the benefit from psychological and social treatment as well as from other perks of the golf courses has a positive effect on customer retention. Therefore, the relationship benefits of golf courses are important to warrant customer retention and profitability. Second, the social benefits and perks among various relationship benefits have been proven to be relatively higher among female visitors than among male visitors. Therefore, golf courses are best advised to focus on female visitors when coming up with their relationship benefits strategy. Therefore, the feasibility of relationship benefit as a marketing strategy in golf resorts has been validated, thereby arriving at a conclusion that it is necessary to approach relationship benefits according to the gender of visitors.