쥐를 대상으로 한 산화 스트레스와 근육 발달 연구에서 동일 강도의 자발적 운동과 강제적 운동의 효과 차이 연구

최근훈(Geunhoon Choi),장래근(Laeguen Jang),송영주(Youngju Song),정유진(Eujin Jung),윤정원(Jungwon Yoon),박현(Hyon Park) 한국생활환경학회 2017 한국생활환경학회지 Vol.24 No.2

The aim of this study is to clarify the physiological effects from these two different ways of aerobic exercise methods in various parameters. Thirty male rats(20 wks old) completed 6 wks of exercise. The wheel exercise was performed with counting of rotations then their total working distance(apprx 400 m/day) was applied same to treadmill exercise. To measure the oxidative stress level, rats were decapitated right after he daily exercise bout. Plasma samples were used for determination of Reactive Oxygen Metabolites(d-ROMs) and Biological Antioxidant Potential(BAP) test. To compare muscle properties, we extracted five muscles(soleus, plantaris, Extensor Digitorum Longus(EDL), Flexor Hallucis Longus(FHL), Tibialis Anterior(TA)) and then measured each muscle weight and the enzyme activity of Citrate Synthase(CS), especially in plantaris. There was no significant difference in d-ROMs test, however, in the BAP test, treadmill and wheel groups showed higher value than control group(p<.05). There were no significant differences in muscle weight. In CS activity, both exercise groups showed significant increase, but no significant difference between these two groups(p<.05). Wheel group showed the highest value between groups. Even though most of results showed no significant difference, the pattern in muscles morphology, oxidative stress, and aerobic exercise capacity may show slight difference. From these results, we have to consider the difference between ways of exercise according to the target variables and the purpose of research properly.

자발적 또는 강제적 운동이 알츠하이머병 유발 쥐의 인지기능에 미치는 영향

최근훈(Choi, Geun-Hoon),장래근(Jang, Lae-Geun),송영주(Song, Young-Ju),정유진(Jung, Eu-Jin),박현(Park, Hyon) 한국체육과학회 2019 한국체육과학회지 Vol.28 No.3

Comparison of the level of bio-molecular components related with the working of GABA from reactive astrocytes through different types of exercise was performed. For the exercise of STZ induced AD rats activity wheel was used for voluntary exercise and treadmill was used for forced exercise for 6 weeks. To equalize the amount of exercise, the voluntary exercise was performed ahead, and then the forced exercise was given. For the analysis, hippocampus, astrocytes around hippocampus, and blood were used. Cognitive function was evaluated with the radial-arm maze and step-down avoidance apparatus. Exercise groups showed a significant improving compared to non-exercise group(p<.05). GFAP expression was significantly decreased in exercise groups, and the lowest value showed in the voluntary exercise group(p<.001). In GABA, analogous pattern to GFAP was observed. Corticosterone level, forced exercise showed an increase (p<.05), while voluntary exercise showed a decrease compared to non-exercise STZ group(p<.01). The expression of SIRT1 protein showed no significant difference between non-exercise groups, however voluntary exercise group showed a significant increase compared to non-exercise group and to forced exercise group(p<.001). With these results, we were able to assume that exercise can reduce the conversion of astrocytes to reactive form and can drop the GABA concentration with an increase of SIRT1 protein in the brain. It may be interpreted as that any kind of exercise could be beneficial to AD. However, a meaningful difference exist between the forced and the voluntary type of exercise on their effects on GABA and stress in AD subjects. Results made us to assure that properly programmed exercise should be developed in consideration of the specific disease as well as AD. We also can suggest that well-designed human studies on memory impairment in AD with specifically designed exercise programs reflect characteristics of exercise as forced or voluntary type are needed to clarify this matter.

발효 홍삼 섭취가 인체 반응과 유·무 산소 운동 능력 및 각종 혈액 변인에 미치는 영향

박현(Hyon Park),최근훈(Geun-hoon Choi) 한국생활환경학회 2012 한국생활환경학회지 Vol.19 No.5

The purpose of this study is to examine the response of human body after taking Korean red ginseng(RG, steamed and dried root of Panax ginseng C.A. Meyer, family Araliaceae) and to observe exercise performance after taking fermented red ginseng(FRG, fermented red ginseng by yeast and lactic acid bacteria). We made college students take RG and measured heart rate, body surface temperature, and blood flow rate. Then we made athletes in Kyunghee university take FRG to observe their anaerobic·aerobic exercise, peripheral fatigue, and blood profile. As a result of this study, there was no significant difference between two groups; Korean red ginseng group and placebo group differ in heart rate, blood flow rate, and body surface temperature. With anaerobic exercise test, we measured agility, power, maximum muscle strength, and muscle endurance. The result has shown that there was no significant difference between the FRG group and placebo group in all aspects. With shuttle-run test, we measured aerobic exercise capacity. The result has shown that there was a significant difference between two groups; the FRG group had more significant increase(p<.05) compared to placebo group. In blood profile, MDA and SOD, which were variables of anti-oxidant capacity, had no significant difference while the variables of liver function, SGOT and SGPT, also showed no difference. Both variable of peripheral fatigue, CK concentration, and variables of lipid metabolism, TG and TC, had no significant difference between two groups. In conclusion, RG had no effect on human body response but FRG seemed to increase the aerobic exercise performance.

EMS장비를 이용한 마이크로트레이닝이 20대 남성의 신체구성, 등속성 근기능 및 체력에 미치는 영향

송정은(Song, Jung-Eun),최근훈(Choi, Geun-Hoon),박현(Park, Hyon) 한국체육과학회 2016 한국체육과학회지 Vol.25 No.4

This study was performed to provide electro muscle stimulation research field with fundamental information by EMS training and to clarify the effects to body composition, isokinetic function, and physical fitness of WB-EMS training with 20’s males. In this study, the effects of micro-training with EMS device on body composition, isokinetic function, and fitness level was examined on healthy 20"s males(10 control and 10 trained). Twenty minutes of micro-training, once a week for 12 weeks were performed on training group and no specific activity was required to control group for the same period. To evaluate body composition, the changes of body weight, body fat ratio, and muscle mass were traced. Morphological measures(on trunk, hip, upper limbs, and lower limbs), isokinetic muscular function (on limbs and trunk), and also flexibility, agility were measured. After 12 weeks of training, body composition and girths of body parts did not show significant change in the contrary to significant increases on torque of leg flexion and trunk extension in trained group. In fitness variables, the trained showed an increase but the controlled showed a decrease in grip strength. According to the results, twelve trials of micro-training with EMS device once a week may effective on the improvements on some limited functional fitness factors even it is considered not sufficient amount of training as compared to our traditional concept of training.

요골맥파 측정을 통한 장기간의 태권도 수련이 심혈관계 건강에 미치는 영향

유정식(Jeong-sik Yoo),최근훈(Geun-hun Choi),강희정(Hee-jeong Kang),박현(Hyon Park) 한국생활환경학회 2013 한국생활환경학회지 Vol.20 No.3

The systolic augmentation index (AIx) can be obtained from the central arteries and peripheral arteries. It has been proven that the AIx in the central arteries, including the aorta and carotid arteries, changes with age. The investigation to find possible usage of AIx from radial artery as an index for vascular aging was done. Radial pulse wave were obtained from 52 subjects(26 taekwondo athletes age 20.83±0.20 yrs, height 178.31±0.88 cm, weight 70.98±1.59 kg, BMI 22.29±0.40 kg/m2, 26 control age 21.07±0.34 yrs, height 174.79±0.98 cm, weight 68.71±1.87 kg, BMI 22.42±0.48 kg/m2) with no cardiovascular disease, using radial tonometry. Heart rate(HR) was significantly lower in taekwondo athletes than in control(athletes 65.02±0.82 beat/min, control 71.81±0.80 beat/min, p<.000). The value of main peak(h1) was significantly higher in taekwondo athletes than in control(athletes 192.90±3.86mmHg, control 173.45±3.22 mmHg, p<.000). The value of contract incident duration ratio(t1/t) was significantly lower in taekwondo athletes than in control(athletes 0.12±0.00, control 0.13±0.01, p<.000). The value of systolic duration ratio(t4/t) was significantly lower in taekwondo athletes than in control(athletes 0.33±0.00, control 0.35±0.00, p<.000). The value of high pressure duration ratio(w/t) was significantly lower in taekwondo athletes than in control(athletes 0.098±0.00, control 0.104±0.00, p<.05). AIx had no difference between 2 groups(athletes 49.68±1.07, control 50.27±16.45, p>.05). These findings indicate that the effect of taekwondo training had positive effects on radial pulse wave.

동계 스케이트 선수들의 다량영양소와 미량영양소 섭취 실태 분석 및 평가

정유진(Jung, Eu-Jin),최근훈(Choi, Gun-Hoon),송영주(Song, Young-Ju),조성숙(Cho, Seong-Suk),박현(Park, Hyon) 한국체육과학회 2016 한국체육과학회지 Vol.25 No.2

This study was carried out to analyse and evaluate the intake status of macronutrient and micronutrient in ice skate players. Subjects were 135 ice skate players consisted of short-track players(n=94) and speed skate players(n=41). Dietary intakes based on using one-day food records(one weekday, not weekend). After data were collected, their energy intakes were analysed using Dietary Reference Intakes for Koreans; KDRIs. Major results of the study were as follows: carbohydrates, calcium, and vitamin D intakes of all players were less than Recommended Dietary Allowances for Koreans; KRDA(F=4.894 for carbohydrate, F=2.497** for calcium, F=0.621 for vitamin D). Iron intake of female player was less than KRDA(F=0.884 for iron). Vitamin C intake of players were less than KRDA except female players in their 20"s(F=2.788** for vitamin C). In conclusion, nutrition education program for young ice skate player is needed to manage their conditioning such as preventing injuries and improving athletic performance during intense training and competition.

태권도 선수들의 심부온도를 낮추기 위한 전략으로서의 차가운 물 섭취에 대한 효과 검증

장래근(Jang, lae-Guen),정유진(Jung, Eu-Jin),최근훈(Choi, Geun-Hoon),박현(Park, Hyon) 한국체육과학회 2018 한국체육과학회지 Vol.27 No.2

Cold-water ingestion is an effective pre-cooling method and this method reduce core body temperature and improve performance. However, A practical and effective method of precooling for application at high-intensity interval events like as Taekwondo Kyorugi venues has not been demonstrated. Therefore aim of this study is to determine whether recovery benefits of pre-cooling before Taekwondo Kyoruki in the real competition environment (temperature=16℃; humidity=28%). Ten healthy, fit, collegiate taekwondo players (ten male; mean (SD) age 19.7 (0.5) years; weight 68.63 (5.7) kg; height 175.82 (2.9) cm) completed 6 minute taekwondo specific a trial match on separate 1hour twice (randomised, crossover design). Participants ingested 1000 mL of cold (2℃) or normal (24℃) water in 4×250-mL aliquots over 30 and 10minutes of pre-exercise rest. During a 1st trial match and recovery, there was no interaction(core: F=0.38, P>.05, lactate: F=0.68, P>.05), only time main effect (core: F=37.16, P<.05, lactate: F=141.43, P<.05). During a 2nd trial match and recovery, it also no interaction (core: F=1.86, P>.05), only time main effect(core: F=75.41, P<.05) however, there was interaction in lactate(F=3.09, P<.05). We demonstrated that pre-exercise ingestion of cold water is not effective precooling method suitable for taekwondo-based application but pre-exercise ingestion of cold water may effect recovery when have a one after another match

Core and body surface temperature changes during sledge hockey competition

Jung, Eu-Jin(정유진),Jang, Lae-Guen(장래근),Choi, Geun-Hoon(최근훈),Park, Hyon(박현) 한국체육과학회 2017 한국체육과학회지 Vol.26 No.2

슬래지 하키는 아이스하키의 한 종류로서 주로 하지기능에 장애를 가진 사람들 사이에서 행해지는 스포츠이다. 이러한 슬래지 하키는 아이스하키와 거의 비슷한 운동 강도와 체력을 요구하기 때문에 슬래지 하키는 장애인 스포츠 중에서도 가장 높은 지구력을 요구하는 종목이라고 알려져 있다. 그러나 척수장애인들과 절단장애인들의 경우, 운동 중 체온조절 기전은 장애가 없는 일반인들과는 다르기 때문에 척수장애와 절단장애를 가진 슬래지 하키 선수들은 격렬한 운동 중 발생하는 열 스트레스에 노출될 가능성이 일반 운동선수들 보다 크다. 따라서 본 연구의 목적은 슬래지 하키 경기 중의 척수장애와 절단장애를 가진 선수들을 포함한 슬래지 하키 선수들의 심부온도와 체표면 온도를 관찰함으로써 그들이 열 스트레스에 얼마나 노출되는지 파악하는 것이다. 척수장애와 절단장애를 포함한 9명의 슬래지 하키 선수들이 이 연구에 참여하였으며 대상자들의 심부온도와 체표면 온도는 시합 전, 중, 후에 측정하였다. 측정결과 각 피리어드 후와 시합 종료 직후 10분 시점의 심부온도가 시합 전의 심부온도보다 유의하게 증가하였다. 체표면 온도의 경우, 각 피리어드 종료 후의 체표면 온도는 시합 전의 체표면 온도보다 유의한 증가가 나타났다. 또한 장애를 가지고 있지 않은 사람들과 비교했을 때 슬래지 하키 선수들은 더 높은 심부온도의 변화가 나타났다. 따라서 본 연구의 결과는 척수장애와 절단장애를 포함한 슬래지 하키 선수들의 경우 고강도의 운동 시, 장애를 가지고 있지 않은 일반인들 보다 심부온도의 조절에 어려움이 있다고 사료된다.