대학 리듬체조선수의 단기간의 체중감량이 신체구성에 미치는 영향

주영삼(Ju Young-Sam) 한국생활환경학회 2011 한국생활환경학회지 Vol.18 No.4

Rhythmic gymnasts performing at high exercise intensity are exposed to particularly intense weight loss. The deleterious effect of this factor could a serious problem on skeletal maturation and pubertal development in elite female rhythmic gymnasts. The aim of this study was to investigate the effects of weight loss on health-related fitness and hemodynamic responses. Ten elite female rhythmic gymnasts were recruited in this study. All subjects completed diet program under the supervision of a dietician for 10 days. Percent body fat, blood lipids, VO₂max, and cardiovascular responses were measured before and after diet program. With weight loss program, although there were no differences in total cholesterol, VO₂max, the percent body fat and lean body fat were significantly decreased. Additionally, cardiac output, stroke volume were significantly reduced, while peripheral resistance was significantly increased. There were no differences in systolic blood pressure and diastolic pressure. This study suggests that excessive weight loss for short period must be cautious in elite female rhymic gymnasts, since loss of skeletal muscle mass and diminished cardiac functions may decrease exercise performance.

변형률 모드시험법 특성의 실험적 고찰 및 응용

주영삼(Young-Sam Ju),이형석(Hyung-Seok Lee),이건명(Gun-Myung Lee) 한국소음진동공학회 2000 한국소음진동공학회 학술대회논문집 Vol.2000 No.1

이단평행봉 뒤 공중돌아 내리기 동작의 운동학적 분석

조태호(Cho Tae-Ho),주영삼(Ju Young-Sam) 경희대학교 스포츠과학연구원 1995 체육학논문집 Vol.23 No.-

  In an attempt to investigate the difference between once and twice in back tumbling shown in the process of touching the down bar in girl"s parallel bars in the field of heavy gymnastics, we selected three gymnastic girl players as subject, and analyzed them, by way of 16㎜ high-speed camela on the photography of 50 tram/sec.<BR>  we came to a conclusion as follows;<BR>  1. For a position change in the center of body, the distance of horizontla and vertical movement didn"t make a great difference.<BR>  2. For a speed change on the center of body, the turn around twice was not shown more rapidly than that once until becoming the stage of seperating hands from bar, and both of tumbling were shown fast at the them of landing, making a defective factors on scores.<BR>  3. In the process of performing a great revolution in the bar called "Taecha", the angle of a shoulder joint did not maintain 180 degrees, making defective factors on scores.<BR>  4. In the process of tumbling in the air, the angle of the main joint was not completely flexed in both revolution, making an unfavorable factors on scores.<BR>  5. In the process of a great revolution in the bar, it look less time for a turn around twice than that once where as a certain pattern was not shown in the totally consuming time.

평행봉 몸 접고 2회전 뒤 공중 돌아 내리기 동작 평가

송주호 ( Song Joo Ho ),박종철 ( Park Jong Chul ),김미향 ( Kim Mee Hyang ),주영삼 ( Ju Young Sam ),정진수 ( Jung Jin Soo4 ) 한국스포츠정책과학원(구 한국스포츠개발원) 2014 체육과학연구 Vol.25 No.2

이 연구는 평행봉 몸 접고 2회전 뒤 공중 돌아내리기 동작의 정량적 분석과 정성적 분석을 통해 개인별 문제점과 기술 개선을 위한 피드백을 제공함으로써 동작의 완성도를 높이고자 하였다. 분석을 통한 피드백을 제공 내용은 다음과 같다. KHH는 릴리스 타이밍이 빨라 회전속도의 감속에 문제가 발생한 것으로 나타났다. NYI는 릴리스 시 좌측으로 밀어주지 못하고 동체 회전이 크게 나타나 중심이 후방으로 빠지는 동작을 나타내 공중회전 시 손의 위치 교정 등을 통해 ‘V자’ 자세를 만들 수 있도록 노력해야 한다. RSD는 회전이 부족한 상태로 착지하는 것으로 나타났는데, 2구간에서 평행봉의 탄성을 이용할 수 있는 훈련 및 손의 위치 등의 교정이 필요한 것으로 나타났다. PMS는 착지구간에서도 지속적으로 동체회전각속도가 증가하고 있어 불안정한 착지가 발생하고 있으며 체공 높이 확보를 위한 훈련이 요구된다. PEJ는 릴리스 시 신체중심 수직위치가 높아 체공 높이에 긍정적인 영향을 미치며 이상적인 ‘V자’자세를 취하며 공중회전이 이루어진 것으로 나타나 비교적 안정된 착지자세를 취한 것으로 나타났다. BGR는 신체중심 수직위치가 높아 체공 높이에 긍정적인 영향을 미칠 뿐만 아니라 이상적인 ‘V자’ 자세를 취하며 공중회전이 이루어진 것으로 나타나 가장 안정된 착지자세로 이어진 것으로 나타났다. YHS은 릴리스 순간 수평보다는 수직방향으로 밀어야 체공 높이에 긍정적 영향을 미칠 것이며, 특히 공중회전 시 손의 위치도 대퇴부분이 아닌 무릎 뒤쪽을 잡아야 ‘V자’ 자세를 보다 효과적으로 취할 수 있을 것이다. CJY는 고관절각이 릴리스 순간 가장 작게 나타나면서 수직 상승을 위한 자세를 취하지 못했으며, 무릎관절 각이 가장 작게 나타나 신전시키지 못한 상태로 회전과 착지 동작을 수행하는 것으로 나타났다. The purpose of this study was to identify the characteristics through technical analysis of dismount to perform the successful landing. The subjects in this study were male gymnastic players of the national team, hish-speed cameras were used to record the salto backward dismount on the parallel bars of the subjects and to study the qualitative and quantitative analysis. The evaluations including feedback of each subjects’problem were as follow: KHH showed early release timing compared to other players. It could be one of factors which can not decelerating the rotational speed, so the correction of posture is needed. NYI didn’t slide to the left at the release phase, and showed big rotation of body compared to other players so the center of mass moved to the rear. The correction of the hand position at flight phase is necessary to perform the V-shaped position. RSD landed in a state where the rotation is insufficient, so the training using elasticity of parallel bars at phase 2, and the correction of hand position are in need. PMS’s rotation angular velocity of body increased consistently, so showed instable land. Therefore the training to ensure the height of flight is required. PEJ showed high vertical position of CM at the release phase which is help for height of flight. He performed ideal V-shaped position, and took a relatively stable landing position. BGR also showed high vertical position of CM and performed ideal V-shaped position, so he landed in a posture in which the most stable. YHS should push vertically rather than horizontally at the moment of release. Especially, the hand position is not on the hamstring but on the back of the knee to perform the ideal V-shaped position. CJY showed little hip angle at the release phase, so he can’t take a position for vertical rise. Also he showed the lowest knee angle and performed rotation and landing in a state that cannot extend the knee. If such problems are corrected, it will be helpful to landing position not only in parallel bars but also in other events.

이단평행봉 위 공중돌아 내리기 동작의 운동학적 분석

조태호,주영삼 경희대학교 체육과학연구소 1995 體育學論文集 Vol.23 No.-

In an attempt to investigate the difference between once and twice in back tumbling shown In the process of touching the down bar In girl's parallel bars in the field of heavy gymnastics, we selected three gymnastic girl players as subject, and analyzed them, by way of 16mm high-speed camera on the photography of 50 fram/sec. We came to a conclusion as follows; 1.For a position change in the center of body, the distance of horizontla and vertical movement didn't make a great difference. 2.For a speed change on the center of body, the turn around twicee was not show more more rapidly than that once until becoming the stage of seperating hands from bar, and both of tumbling were shown fast at the them of landing, making a defective factors scores. 3.In the process of performing a great revolution the bar called "Taecha", the angle of a shoulder joints did not maintain 180 degrees, making defective factors on scores. 4.In the process of tumbling in the air, the angle of the main joint was not completely flexed in both revolution, making an unfavorable factors on scores. 5.In the process of a great revolution in the bar, it look less time for a turn around twice than that once where as a certain pattern was not shown In the totally consuming time.

변형률 모드시험의 특성 및 미측정 주파수응답함수의 예측

주영삼,이건명 慶尙大學校生産技術硏究所 1999 生産技術硏究所論文集 Vol.15 No.-

The types of responses which are generally measured in the model testing, are displacement, velocity or acceleration. However, in this paper, we will study the characteristics of strain modal testing which are not investigated actively, but its theoretical establishment is already completed. To investigate the characteristics of strain modal testing, a stainless steel cantilever beam was used. An impact hammer and a shaker were used for excitation, and strain responses were measured by straingages. Strain frequency response functions(FRFs) were measure for various excitation force levels, excitation signals, and frequency ranges along with coherence functions. The complex exponential method was used to estimate modal parameters from the measured FRFs. A strain FRF at a point which is difficult to be measured can be predicted from displacement FRFs and strain FRFs at other points. The strain FRF predicted in this way was compared with the actually measured one.