• 한국운동역학회지
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• 제21권3호
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• pp.269-279
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• 2011

This study was analyzed the characteristics on the stability of posture while conducting a through two and half rotation technic of pench$\acute{e}$ in rhythmic gymnastics. Two rhythmical gymnastics player(LKH and SSJ) who is a member of the national team were selected, and for obtain the kinematic and kinetic variables were used a ProReflex MCU 240 infrared camera(Qualisys, Sweden) and a Type9286A force platform(Kistler, Switzerland). The mechanical factors were computed by using Visual3D program and Matlab R2009a. During the landing and rotation phase the results showed following characteristics; 1) In medial-lateral and horizontal displacement of the support foot, LKH showed smaller movement than SSJ, but SSJ showed smaller movement than LKH in swing foot. LKH showed bigger movement in medial-lateral axis of COP and vertical axis of COG, but SSJ showed bigger movement in horizontal axis of COP and medial-lateral axis of COG. 2) SSJ showed bigger maximum horizontal and vertical velocity at P1 and P2 than LKH. 3) In the inclination angle of COP and COG, SSJ showed smaller change than LKH, but within medial-lateral tilt of the shoulder, LKH performed rotation motion in horizontal position than SSJ. There was no differences in each force components during rotation, but on landing phase, the results showed a characteristic that SSJ exerted bigger breaking force and vertical force than LKH.

• 한국운동역학회지
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• 제12권2호
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• pp.65-75
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• 2002

본 연구는 리듬체조를 구성하는 기술 중에서 신체 기본요소군의 Jump에 포함되는 C난도 Ring jump의 3차원 동작분석을 통해 분석하여 선수들의 기술향상과 지도에 필요한 정량적 자료를 제공하는데 목적을 두었다. 이벤트별 소요시간에서는 E-3에서 0.409${\pm}$0.017sec로 가장 긴 소요시간을 보였다. 신체중심의 변위에서는 E-3에서 88.5${\pm}$1.3%로 가장 높은 높이를 보였다. 좌 우 발끝 속도에서는 E-2에서 각각 732.4${\pm}$46.1cm/sec, 1958.4${\pm}$25.1cm/sec로 가장 빠르게 나타났다. 상체후경각에서는 E-3에서 97.8degree로 가장 낮은 각도를 보였다. 슬관절 각변위에서는 E-3에서 좌 우 각각 92.8${\pm}$14.9degree, 69.2${\pm}$5.7degree로 가장 낮은 각도를 보였다. 족관절 각변위에서는 E-3에서 좌 우 각각 171.3${\pm}$6.9degree, 167.9${\pm}$8.4degree로 가장 큰 각도를 보였다. 이런 결과로 볼 때, Ring jump동작을 수행하기 위해서는 족관절의 신전을 통한 높은 점프로 상체를 후경할 수 있는 유연성과 체공을 시간을 갖추는 것이라고 사료된다.

• Nutritional Sciences
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• 제8권2호
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• pp.118-124
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• 2005

To examine the eating attitudes, weight concerns, dietary intake, and menstrual function of Korean female elite athletes, 109 subjects in seven sports disciplines (rhythmic gymnastics, synchronized swimming, badminton, volleyball, Taekwondo, field hockey, and soccer) responded to a questionnaire consisted of three parts; eating attitudes and behavior(Eating Attitude Test-26; EAT26), body weight perception (Body Dissatisfaction Index: BDI) and weight control behavior, and menstrual history and status. They also recorded three-day dietary intake. Body weight (43.6$\pm$4.3 kg) and body mass index (16.7$\pm$1.4 kg/$m^2$) in rhythmic gymnasts were lower than those in other athletes (P<0.05). EAT26 scores were not different among sport events (12.3$\pm$6.5 total), however, eating disturbances (EAT26 score$\geq$20) were highly prevalent in aesthetic athletes ($30\%$) than in others ($5\%$). More than half of the athletes perceived themselves overweight and four fifth of the athletes desired to reduce weight about 4.4 kg. The gymnasts consumed the lowest caloric intake (1028:t371) while the volleyball players did the highest (2995$\pm$342 kcal/d) (P<0.05). The BDI score was not different among sport events. Three fourth of the athletes experienced weight control, and the most frequently used weight reduction method was exercise followed by using robber suits, diet, and sauna. About $40\%$ of the subjects reported irregular menstrual cycles, but menstrual dysfunction ($\leq$6 menses/yr) was only $5\%$. Generally, the Korean female elite athletes desired to reduce weight from their current body weight. No differences in eating attitude and body dissatisfaction were noticed among athletic disciplines. However, eating disturbances were highly prevalent in aesthetic athletes who also reported much less energy intake than the recommend daily energy intake. It appeared that weight reduction methods were not properly practiced in these population. Menstrual dysfunction was minimally reported.