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요부 안정화 운동이 여자대학생의 척추측만도, 심부근 면적, 근기능 및 요통지수에 미치는 영향
이정석 ( J. S. Lee ),소용석 ( Y. S. So ),김미자 ( M. J. Kim ),문성진 ( S. J. Moon ),장성동 ( S. D. Jang ),김영준 ( Y. J. Kim ) 한국운동생리학회(구-한국운동과학회) 2011 운동과학 Vol.20 No.1
본 연구는 여자대학생을 대상으로 요부 안정화 운동이 체간의 심부근인 다열근의 면적증가, 콥스각의 변화 및 주관적 통증지수(VAS)의 상호연관성을 규명하는데 목적이 있다. 연구대상은 여자 대학생 30명을 대상으로 척추 X-ray 촬영하여 Cobb`s 각에 이상이 있는 체형불균형으로 진단된 20명을 운동군 12명과 대조군 8명으로 분류하였다. 운동 프로그램은 8주간, 주 3회, 운동 강도는 1~4주는 40~50% HRR, 4~8주는 50~60% HRR, 운동시간은 1회 90분 실시하였다. 측정항목은 심부근 면적, 척추측만도, 요통지수, 등속성 운동에 의한 근기능 검사와 상호연관성을 검사 하였다. 다열근 면적은 운동군에서 시기 간에 L1과 L5에서 유의한 차이가 나타났으며, 집단 간의 비교에서는 L5(우)에서 유의한 차이가 나타났다. 요통지수는 시기 간에 유의한 차이가 났으며, 등속성 운동에 의한 근기능 검사에서는 집단 간에 최대근력에서 유의한 차이가 나타났다. 이중 다열근 면적의 증가는 척추측만각도를 감소시킴으로서 요통 통증지수의 감소에 효과적인 것으로 나타났다. 결론적으로 요부 안정화 운동은 척추측만도, 심부근육면적, 요통지수 및 근기능 개선에 효과적인 운동으로, 체형불균형으로 인해 나타날 수 있는 병적 요인들을 감소시킬 수 있을 것으로 사료된다. The research was carried out to investigate the effect of lumbar stabilization exercise in the multifidus area, the Cobb`s angle and correlations of subjective VAS in the female university students who had participated in a lumbar stabilization exercise program. Thirty female university students aged 20-24 were taken spinal X-ray. Twenty who have abnormal Cobb`s angle were diagnosed as an imbalance in their body and they were sorted into exercise group(n=12) and control group(n=8). The exercise program was proceeded for 8 weeks, 3 times/week and 90 minutes/time. The intensity of exercise were 40-50% HRR during 1-4 weeks, 50-60% HRR during 4-8 weeks. Deep muscle area, scoliosis, VAS, and Cobb`s angle were measured. The effects of muscular function test and correlation of the measurements were tested as follows. There were significant differences in area between the time of the multifidus muscle L1(left, right) and L5(left, right) in appearance. And in comparisons with among groups, there were significant differences in the L5 multifidus muscle. There was meaningful difference in VAS of exercise group. In case of the muscular function test by Isokinetic exercise, meaningful differences in peak torque were founded among the groups. And also, there were meaningful differences among groups as well. In conclusion, lumbar stabilization exercises have positive effects on cobb`s angle, multifidus area, VAS and the improvement of muscular function. As the significant correlation was appeared between increases of multifidus area and decreases of VAS, it is possible to reduce pathological factors which appeared in the imbalances through increases of deep muscle by high lumbar stabilization exercise.
장성만(S. M. Jang),김석환(S. W. Kim),한송엽(S. Y. Hahn),정현교(H. K. Jung) 한국자기학회 1992 韓國磁氣學會誌 Vol.2 No.1
This paper describes the energy and speed characteristics of an induction coil-gun. The coil-gun has some merits that it can be easily installed and repeatedly used many times, it does not damage mechanically in the course of launch and the force exerted on the projectile is distributed uniformly. An equivalent circuit is employed for modeling the coil-gun. The circuit equations and equation of motion are then derived based on the equivalent circuit. These equations are solved numerically by using Runge-Kutta method. Finally the energy transfer ratios are obtained according to the variations of the resonant frequency of driving circuit and charging voltage of capacitors. The muzzle velocities of projectile are also obtained according to the variations of electrical conductivity and initial position of projectile, firing angle of driving circuit, charging voltage of capacitor and resistance of driving coil, respectively.