유체의 점성에 따른 직렬연결 마이크로펌프 성능 비교

허성훈(Sung Hoon Hur),김보흠(Bo Heum Kim),이상준(Sang Joon Lee) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12

In this study, we investigated experimentally the effect of fluid viscosity on the performance of a serial-connected valveless micropump (SCV micropump) fabricated by a conventional MEMS fabrication process. The micropump consists of serial-connected two pump chambers with identical chamber volume and three diffuser valves. A piezoelectric disc was bonded on the chamber using epoxy resin. The performance of the SCV micr opump was investigated with varying fluid viscosity from 1.04 mPa?s to 2.28 mPa?s. For low fluid viscosities, the double chambers operation of the micropump has lower pump power, compared to the single chamber o peration. However, reciprocal results are obtained for the cases of high fluid viscosities. The present experime ntal results show that fluid viscosity is an important factor in the pumping performance of a SCV micropump.

젖산염의 섭취가 육상 선수의 장시간 달리기 운동수행력에 미치는 영향

허성훈 ( Sung-hoon Hur ),안경준 ( Kyung-Jun An ),김윤미 ( Yoon-mi Kim ),권영우 ( Yeung-woo Kwon ),이종삼 ( Jong-Sam Lee ) 한국체육대학교 체육과학연구소 2021 스포츠사이언스 Vol.39 No.3

본 연구의 목적은 육상 선수를 대상으로 젖산염의 섭취에 따라 혈중 생리적 지표와 운동수행력에 미치는 효과를 규명하여 운동 선수들의 경기력 향상에 기초 자료를 제공함에 있다. 대구 소재 D대학교의 재학중인 중-장거리 육상 선수 총6(남 5, 여 1)명을 선정하였다. 실험 절차는 총 4회(음료를 섭취하지 않은 조건, No drink; 물을 섭취한 경우, Water; 이온 음료, Ion fluid; 젖산염이 함유된 음료, Polylactate)의 실험에 참가하였으며, 운동 강도 적용은 Karvonen et al.,(1957)의 예비심박수 산출 공식을 이용해 예비심박수의 65, 85, 90%에 해당되는 목표 심박수를 적용해 산출하였다. 음료의 섭취는 총 8회(운동 전 -30, -5분, 운동 중 15, 30, 45, 60, 75, 90분)에 걸쳐 이루어졌으며, 혈액 표본 채집 및 생리적 변인의 측정은 총 4회(-40, -5, 90분, All-out) 채집하여 분석한 결과, 첫째, 장시간 달리기 운동 중 음료 섭취에 따른 혈중 생리적 지표(glucose, lactate, pH, HCO₃^-)의 유의한 변화를 나타내지 못했다. 둘째, 장시간 달리기 운동 중 음료 섭취에 따른 운동수행력(time to exhaustion)을 분석한 결과, 장시간 달리기 운동 중 음료 섭취 형태에 따른 운동수행력은 음료를 섭취하지 않은 조건(ND: 12.4±8.7분), 물을 섭취한 경우(Water: 21.8±1.1분), (PS: 28.2±12.5분), 젖산염이 함유된 음료(CM: 36.7±7.6분) 순으로 운동 수행 시간이 향상된 것으로 나타났으나 젖산염이 함유된 음료는 이온 음료와 비교해 유의한 기록의 향상은 나타나지 않았다. This study aims to to find out the effect of polylactate ingestion on physiological indices exercise performance in elite distance runners. Six (5 male and 1 female) elite distance runners (age: 21.3±0.7 years, height: 168.0±7.1 cm, body weight: 55.1±7.8 kg, VO₂max: 66.6±3.3 mL·kg^-1·min^-1) volunteered for this study. In a single blind and random cross over design, subjects participated separated 4 trials; No Drink (ND), Water, PS (ion fluid), CM (polylactate). Blood sample were collected during the four phases of treadmill exercise; rest exercise (-40 min), before exercise (-5 min), after exercise (90 min) and all-out. Runners performed continuous exercise with ingestion of drink (ND, Water, PS, CM) at 65% of THR (target heart rate) for 90 minutes followed by 85% of THR with 5°for 20 minutes (if completed 85% running performance then applied 90% of THR with 5°) until volitional time to exhaustion (TTE). There were no differences between the conditions for any physiological indices. Running TTE increased for CM compared to between ND and Water trials (12.41±5.60 min and 21.82±0.69 min, respectively). However, time to exhaustion did not differ between both conditions (28.22±8.06 and 32.09±9.90 minutes for PS and CM). This study demonstrated that ingestion of polylactate does not sufficiently large to improve extracelluar buffering capacity and endurance exercise performance.

무처리 지반에서 압밀침하량 예측방법에 대한 연구

허성훈(Sung-Hoon Hur),임종철(Jong-Chul Im),장지건(Ji-Gun Chang),주인곤(In-Gon Ju) 한국지반환경공학회 2009 한국지반환경공학회 학술발표회논문집 Vol.2009 No.9

Perilipin 단백질과 근육 내 중성지방의 상호작용이 PPARβ/δ발현에 미치는 효과

허성훈(Hur, Sung-Hoon),안경준(An, Kyung-Jun),이종삼(Lee, Jong-Sam) 한국체육과학회 2021 한국체육과학회지 Vol.30 No.4

PURPOSE: We investigated interaction of perilipin protein and intramuscular triglyceride on expression of PPARβ/δin rat skeletal muscle. METHOD: A total of thirty-six male Sprague-Dawley were used in the study. Rats were divide into three groups: control (n=12), fasted (n=12), aerobic exercise (n=12). Aerobic exercise consist of 2-h (30 min × 4 cycle) swimming exercise and fasting included 18-h with only water. We determined intramuscular triglyceride (IMTG) content, perilipin (PLIN3, PLIN5) and PPARβ/δprotein expression, citrate synthase (CS), β-hydroxyacyl-CoA dehydrogenase (β-HAD) activity. RESULTS: Our analyses indicate that acute aerobic exercise and fasting unaltered IMTG content both soleus and white gastrocnemius muscle. Skeletal muscle PLIN3, PLIN5, PPARβ/δexhibited a less response to experimental conditions. CS and β-HAD activity remained unaffected. CONCLUSIONS: These data indicate that exercise stimulus insufficient to improved lipid metabolic capacity. The metabolic health benefits of exercise training to be fully elucidated in older and clinical populations.

장시간 운동 및 단식이 PPARs isoforms 사이의 단백질 발현에 미치는 효과

허성훈(Hur, Sung-Hoon),안경준(An, Kyung-Jun),이종삼(Lee, Jong-Sam) 한국체육과학회 2020 한국체육과학회지 Vol.29 No.6

PURPOSE: The purpose of this study was to investigate the effect of prolonged exercise and fasting on PPAR isoforms(PPARα & PPARγ1) in rat skeletal muscle. METHOD: Thirty-six male rats (Sprague-Dawley) were assigned to one of three subgroups: control (n=12), fasted (n=12), exercise (n=12). Rats treated swimming exercise (2hr; 30 min × 4) and fasting (18hr). We measured PPAR isoforms content(PPARα & PPARγ1), liver glycogen, glucose, FFA concentration. All data are presented as means±SD. Date were analyzed with one-way ANOVA, post hoc analysis was perfo rmed to determine using Tukey’s post hoc test. Singificance was set at P<.05. RESULTS: In fasted rats, liver glycogen concentration significantly decreased compared to control (P<.001) and exercisee (P<.01). Despite the increases in the FFA level both exercise and fasting, there was no significant changes were detected in PPARα & PPARγ1 protein content in soleus muscle (P>.05). CONCLUSIONS: Collectively, these results indicate that PPARα & PPARγ1 protein unaffected by both exercise and fasting and/or elevated in FFA concentration. Further studies are required to determine intert issue communication during combined fasting and exercise.

전·평시 장병 건강 및 체력관리 프로그램 개발

김운철 ( Woon Chol Kim ),허성훈 ( Sung Hoon Hur ),안경준 ( Kyung Jun An ),김성훈 ( Sung-hoon Kim ),성열호 ( Maj Yul Ho Sung ),김성종 ( Col Sung Jong Kim ),조승호 ( Col Sung Ho Jo ),이종삼 ( Jong Sam Lee ) 국군의무사령부 2018 대한군진의학학술지 Vol.49 No.1

This study aims to review a need of change in soldier’s physical training and develop new training factors. Such factors of physical fitness tests were proposed for soldier’s health and fitness management, and their training effects were tested in this study. No significant effect on 12-min running performance was found at CON and ETG, but NTG showed a significant improvement after the exercise(Postexe, P<.05). As for the performance change in the 20kg-weight transferring capacity on every 5-m interval, CON and NTG showed a significant difference at post-exercise, compared to pre-exercise estimates(P< .05), while ETG had no significant effect(P >.05). For more details, the transferring distance by CON decreased by 10.5%, while ETG and NTG marked an increase of 0.4% and 6.8%, respectively. As for the change in isometric muscular endurance performance, CON’s endurance time decreased by 2.6%, but ETG and NTG showed an increase of 18.7% and 37.7%, respectively. Most noticeable improvement was made by NTG. Sit & Reach test results showed every group’s performance decreased commonly after the exercise, but NTG’s range of decrease(-0.2cm) was markedly smaller than ETG(-0.8cm) and CON(-0.7cm). Such decrease in record came from stiffened muscles by a certain temperature fall on the test day after the 4-week exercise training program. However, From NTG’s record showing the smallest decrease, NTG seems to keep the best performance in sit & reach among the groups. The following conclusions can derived from the test results. New exercise training program in this study created a performance increase in 12-min running, 40m sprint with 20kg-weighted backpack, isometric muscular endurance and sit & reach(cardiorespiratory endurance, strength/muscular endurance, abdominal muscle power/endurance/flexibility). This means new exercise training program was significantly effective on endurance/strength/flexibility which are most essentially needed for soldiers. Although other test records in this study didn’t create the changes expected, future studies with different conditions of exercise training and time period will provide better results. Our military forces are recommended to execute the physical training program for soldiers, including the physical factors such as strength, explosive muscular strength, agility and flexibility. The existing endurance-oriented tests and overlapped evaluations should be avoided from physical fitness program and tests, but, instead, explosive muscular strength, agility and flexibility are strongly recommended to be included in the exercise program.

장기간 수중운동 프로그램이 편마비 지체장애 노인의 건강 체력에 미치는 효과

양상봉(Yang, Sang-Bong),안경준(An, Kyung-Jun),허성훈(Hur, Sung-Hoon),김성훈(Kim, Sung-Hoon),원쾅타이(Nguyen, Quang Thai),남인수(Nam, In-Soo),이종삼(Lee, Jong-Sam) 한국사회체육학회 2017 한국사회체육학회지 Vol.0 No.70

The purpose of this study is to investigate the effect of long-term aquatic exercise program on health fitness of the elderly people with hemiplegia disabilities for health promotion by applying the aquatic exercise program to improve the quality of life and prevent falling of thel derly people with hemiplegia disabilities. In this study, six elderly people with hemiplegia disabilities (two maels and four females) living in area C country of G province were selected as study subjects. They were measured (Body composition, Throwing the medicine ball, Grasping power, Isometric endure, Single leg standing, Sitting down and standing up, and Target return) before and after the start of the aquatic exercise program and the following conclusions are obtained. First, long-term aquatic exercise program had no significant differenec in the body composition (p>.05) of the elderly people with hemiplegia disabilities. Second, long-term aquatic exercise program of elderly people with hemiplegia disabilities showed better improvement in medicine ball throwing (p<.01), left grasping power (p<.05), right grasping power (p<.05), one leg stand with eyes closed (p<.05) of health fitness factors. Based on these results, the long-term aquatic exercise program has a positive effect in preventing the daily life of the elderly with hemiplegia disabilities from causing negative changes in body composition. It has been shown an important role in improving the strength and balance ability to improve fall prevention and quality of life. However, the study has not covered changes and difference between male and female. In the future, it is necessary to expand the study based on sexual difference.

수영운동과 식이섭취제한으로 유도되는 체내 글리코겐의 변화가 혈액 및 조직 세포내 IL-6와 관련 신호전달 인자에 미치는 영향

안경준 ( Kyung-Jun An ),허성훈 ( Sung-hoon Hur ),이종삼 ( Jong-Sam Lee ),안나영 ( Na-Young Ahn ) 한국체육대학교 체육과학연구소 2021 스포츠사이언스 Vol.39 No.1

본 연구는 수영운동과 식이섭취제한에 의해 유도되는 근육 조직 내 글리코겐의 변화가 혈액과 근육 조직 세포내 IL-6(interleukin-6)의발현과 긴밀한 연관을 맺고 있는 세포 내 신호전달체계의 변화를 연구하고자 하였다. 실험동물을 통제군(n=12)과 단식군(n=12) 및 운동군(n=12)으로 임의배정하였고, 혈액 및 조직 적출을 위해서 단식군의 경우 오후 4에서 다음날 오전 10시까지 물을 제외한 음식의 공급을 중단해 총 18시간의 단식이 되도록 하였고, 운동군의 경우 오전 8시부터 10시 15분까지 총 2시간의 수영운동(30분 운동 후 5분 휴식)을 실시하였으며, 통제군은 특별한 실험 적용을 하지 않은 상태로 실험이 진행되었다. 첫째, 그룹간 체중의 변화에서는 단식군의 18시간 단식 후의 체중과 비교해 2시간의 수영운동을 하기 전 운동군의 체중과 단식군의 18시간 단식 전의 체중에서 높게 나타났다. 둘째, 혈중 글루코스 농도는 단식군과 비교해 통제군과 운동군이 높게 나타났다. 그리고 혈중 유리지방산의 농도는 통제군에 비해 단식군과 운동군에서 높게 나타났으며, 단식군이 운동군과 비교해 높게 나타났다. 셋째, 조직 내 글리코겐 농도의 변화에서는 soleus와 EDL 모두 단식군과 비교해 통제군과 운동군에서 높게 나타났다. 하지만 조직 내 다른 요인(IL-6, Erk1/2, pErk1/2, p38MAPK)들의 변화는 나타나지 않았다. The aim of this study is to investigate the changes in cellular signaling system associated with the expression of IL-6 (interleukin-6) in blood and muscle tissue cells by the changes in body glycogen induced by swimming exercise and food intake restriction. Randomly assigned to the control group(n=12), the fasting group(n=12), and the exercise group(n=12). In addition, for the extraction of blood and tissues, the fasting group stopped supplying food except water from 4 pm to 10 am the next day for a total of 18 hours of fasting. A total of 2 hours of swimming exercise (5 minutes rest after 30 minutes of exercise) was performed in the exercise group, the control group was experimented with no special experimental application. First, the change in body weight, compared to the weight of the fasting group after 18 hours fasting, the weight of the exercise group before the 2 hours swimming exercise and the weight of the fasting group before the 18 hour fasting were higher. Second, concentration of glucose in blood were higher in the control and exercise groups than in the fasting group. The concentration of free fatty acids in blood was higher in the fasting and exercise groups than in the control group, and the fasting group was higher than the exercise group. Third, changes in tissue glycogen levels were higher the control and exercise groups than the fasting group in the sole and the EDL. However, there was no statistical difference of more than 95% in the changes of other factors in the tissues (IL-6, Erk1/2, pErk1/2, p38MAPK).

복근 지구력 평가 도구로서 등척성 수축 후 버티기 방법의 타당성 비교 검증

박순태(Park, Soon-Tae),허성훈(Hur, Sung-Hoon),이장규(Lee, Jang-Kyu),이종삼(Lee, Jong-Sam) 한국산학기술학회 2014 한국산학기술학회논문지 Vol.15 No.2

본 연구는 복근의 정적 지구력 평가 도구로서의 등척성 버티기 방법의 타당성을 검증하고 최적의 적용 각도 를 결정해내기 위해 수행되었다. 92명(남 68명, 여 24명)의 피험자가 자발적으로 실험에 참여하여 다음과 같은 결과를 얻었다. 유산소 역량과 근지구력 역량 사이의 상관성은 남성에서보다 여성에게서 더 높게 나타났으며 등척성 버티기 의 수행 시간과 윗몸일으키기의 반복 횟수 사이에 정적인 상관관계를 나타냈다. 또한 40도의 경사도를 적용 시 30도 및 50도와 비교해 근지구력과의 가장 높은 상관성을 나타냈다. 이와 같은 결과를 통해 복근지구력의 평가 도구로서의 등척성 버티기 방법이 요부의 잠재적 상해 위험을 지닌 것으로 보고되고 있는 윗몸일으키기 방법을 대체할 수 있는 대안으로 사용될 수 있으며 적용 시 40도의 각도를 적용하는 것이 적절하다는 결론을 내릴 수 있었다. 서로 다른 연 령 및 체력 상태에 따른 최적의 적용 각도에 대해서는 후속 연구를 통해 밝혀져야 할 것이다. The current study was undertaken to verify appropriateness of muscle endurance test at three different angles (30。, 40。, 50。) of isometric contraction position, and to sought valid and reliable testing method that provide an alternative to sit-ups. Total 92 young and healthy subjects (68 males and 24 females) were recruited, and the following results were obtained. 1. A low correlations in males, but a high correlations in females was found when the comparisons were made between aerobic and muscle endurance capability. 2. Measuring tolerance time, by using isometric contraction was showed a significant correlation with the repetition numbers of sit-ups. 3. The highest correlation was found at 40 inclined degrees of plane, and the lowest correlation was drawn from 50 inclined degrees of plane. Based on these results, it was concluded that measuring tolerance time during maintaining an isometric contraction at 40 inclined degrees of plane is a valid and effective tool for measuring abdominal muscle endurance, and it can be used as an alternative way of sit-up, which potentially risky for inducing many back-associated injuries. Further studies need to be undertaken to determine for optimal angles, that can safely be applied for people of various age groups and physical conditions.

호구착용이 검도 운동 시 혈중 생리 지표 및에너지 기질의 변화에 미치는 효과

손용희 ( Young-hee Son ),허성훈 ( Sung-hoon Hur ),박양배 ( Yang-bae Park ),김윤미 ( Yun-mi Kim ),이종삼 ( Jong-sam Lee ) 한국스포츠정책과학원(구 한국스포츠개발원) 2016 체육과학연구 Vol.27 No.3

이 연구의 목적은 엘리트(대학) 검도 선수를 대상으로 실제 검도 운동 시 호구 착용에 따른 혈중 가스 성분 및 생리적 대사 관련 지표들의 변화를 살피는데 있으며 검도 수련 과정에 적용할 수 있는 실제적이고 과학적인 훈련 및 교육 프로그램의 개발에 기여하고자 수행되었다. 연구를 위해 경상북도 소재의 D대학 내 학생 검도 선수 10명을 선정하였으며 사전에 계획된 검도 운동 프로그램에 따라 총 2회에 걸쳐 80분간의 검도 운동을 실시하였다. 총 2회 중 1회는 검도 경기 시 착용해야 하는 모든 호구 장비를 착용한 상태로 운동을 수행하였으며 나머지 1회는 도복만을 착용한 상태에서 동일 시간 운동을 수행토록 하였다. 운동 중 지속적으로 심박수의 변화를 관찰하였으며 운동 실시에 따른 혈중 가스, 이온, 및 에너지 기질의 농도 변화를 조사하기 위해 혈중 생화학적 분석을 실시하였다. 혈중 K⁺와 Ca²⁺은 호구 착용의 유무와 시간 사이에 유의한 상호 작용 효과를 나타내었으며, Hct와 Hb의 경우 호구 착용의 유무와 시간 사이에 유의한 상호 작용 효과는 나타내지 않았으나 운동 수행에 따른 수치의 증가와 함께 호구 착용 시에서 미착용시와 비교해 더 큰 변화를 나타냈다. 호구 착용 여부와 무관하게 검도 운동 후 pH의 유의한 감소가 나타났으나 이에 반해 PO2, Na⁺, glucose, lactate, %Sat O2 수치는 상승하는 것으로 나타났다. 운동 시와 회복 시의 심박수는 호구 착용 시에서 미착용 시와 비교해 높게 유지되는 경향을 나타냈다. 이와 같은 결과를 토대로 검도 운동 시 호구착용이 체내 생리적 대사 지표에 더 큰 변화를 야기할 수 있다는 결론을 도출할 수 있었으며 이는 체수분의 소실 증가와 그에 따른 에너지소비량의 상승과의 연계 가능성에서 비롯된 것이라 생각된다. 후속 연구를 통해 호구 착용이 검도 운동 중 타격 강도에 미치는 영향 및 혈중 호르몬 농도 변화에 미치는 효과 등을 함께 밝힘으로써 호구 착용으로 유도되는 세부적인 생리 효과를 규명할 수 있을 것이다. The purpose of this study was to investigate the effect of wearing of safeguard devices on various blood ions (i.e., Na⁺, K⁺, Ca²⁺) concentrations, gas parameters (PO2, PCO2, hematocrit [Hct], hemoglobin [Hb], Saturated [Sat] O2), and energy substrates (i.e., glucose, free fatty acid [FFA], lactate) concentrations during Kumdo training. Research scope extended to examine the heart rate changes during each exercise sessions. In order to achieve the research goal, 10 male elite Kumdo players, who play for G city in Gyeongsangbuk-do, were participated, and their mean maximum oxygen uptake level was 51.2(±6.1)mL· kg^-1min^-1. All subjects undertook Kumdo training sessions twice, which carefully pre-planned and consisted of routinely carrying out exercise program. Training period for each session was 80 min long including 10 min each for warm-up and warm-down period, but the conditions with wearing body protection devices were different following either with wearing complete set of safeguard devices or without wearing any safeguard devices except general training cloth. Heart rate was measured by every minute interval. K⁺ and Ca²⁺ showed interaction effect between the conditions with wearing safeguard devices and conditions with time of Kumdo training. Hct and Hb level significantly increased after 60 min Kumdo exercise regardless of wearing safeguard devices. Kumdo training induced dropping of blood pH independently with wearing safeguard device conditions, however the values and/or concentrations of PO2, Na⁺, glucose, lactate, SatO2 were significantly increased. Heart rate was maintained marginally higher values throughout exercise period when safeguard devices were worn. Based on these results, it was concluded that wearing the safeguard devices could possibly be causing a physiological metabolic changes, and this may be drawn by increased body fluid loss and energy expenditure. Further study should be undertaken to examine the effects of wearing safeguard devices on hitting intensity and hormone secretion and concentrations, that closely associated with body fluid and ion balance during Kumdo exercise and/or training.