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근육 강성도 힘 피드백을 이용한 하지 보조기의 무릎 신전 운동 보조 특성 분석
김경,강승록,정구영,주수종,김남균,권대규,Kim, K.,Kang, S.R.,Jeong, G.Y.,Joo, S.J.,Kim, N.G.,Kwon, T.K. 대한의용생체공학회 2010 의공학회지 Vol.31 No.3
The lower limb orthosis with a pneumatic rubber actuator, which is intended for the assistance and the enhancement of muscular activities of lower limbs was developed in this study. Compared to other knee extension assistive devices being developed by other researchers, our device is designed especially for the elderly people and intended only for slight assistance so that the subjects can keep their muscular strength. For the effectiveness of system, muscular activities of major muscles in lower limbs during sit-to-stand (STS) and squat motion were measured and analyzed. Subjects were performed the STS and squat motion with and without lower limb orthosis. We made comparison muscular activities between with and without lower limb orthosis. Lower limb orthosis was controlled using muscular stiffness force feedback that is controlled by muscular activities of the measured muscle from force sensor. For analysis of muscular activities, electromyography of the subjects was measured during STS and squat motion, and these were measured using MP 150(BIOPAC Systems, Inc.). Muscles of interest were rectus femoris(RF), vastus lateralis(VL), vastus medialis(VM) and vastus intermedius(VI) muscles in lower limbs of the right side. A biodex dynamometer was used to measure the maximal concentric isokinetic strength of the knee extensors of wearing and not wearing orthosis on right side. The test were performed using the concentric isokinetic mode of test with the velocity set at 60°/s for muscles around the knee joints. The experimental result showed that muscular activities in lower limbs wearing orthosis using muscular stiffness force of a vastus medialis muscle was reduced and knee extension torque of an knee joint wearing lower limb orthosis was increased. With this, we confirmed the effectiveness of the developed lower limb orthosis.
동력 장하지보조기를 이용한 보행운동 재활훈련 시스템 개발에 관한 기초 연구
김경(K. Kim),기영술(Y. S. Ki),정구영(G. Y. Jeong),고명환(M. H. Ko),권대규(T. K. Kwon) 한국재활복지공학회 2010 한국재활복지공학회 학술대회논문집 Vol.2010 No.11
The purpose of this study was to test the effectiveness of a prototype hip-knee-ankle-foot orthosis (HKAFO) powered by two artificial pneumatic muscles during walking. Subjects walked on treadmill at 1.5 krn/h under four conditions without extensive practice: 1) without wearing HKAFO, 2) wearing HKAFO with artificial muscles turned off, and 3) wearing HKAFO powered only in plantaflexion under feedforward control. The experimental result showed that a muscular strength of wearing HKAFO powered plantarflexion under control was measured to be lower due to pneumatic assistance and foot pressure of wearing HKAFO powered plantarflexion under control was measured to be greater due to power assistance.
배종진(J. J. Bae),정구영(G. Y. Jeong),강승록(S. R. Kang),민진영(J. Y. Min),권대규(T. K. Kwon) 한국재활복지공학회 2011 한국재활복지공학회 학술대회논문집 Vol.2011 No.11
본 사례연구는 그동안 전신진동운동(WBV) 장치가 근방추의 신전반사 작용을 유도, 강력한 근수축을 유발시킴으로써 근력 및 근지구력, 순발력을 향상시킬 수 있다는 기존 연구와는 다르게 주파수, 진폭 및 운동종류를 변화시켜 근수축이 아닌 근이완 효과가 있는지를 규명하고자 수행하였다. 피험자는 근골격계 질환 병력이 없는 22세 여성으로 신장은 160cm, 체중은 55kg이었다. 전신진동운동 장치(Sonic World, S. Korea) 위에서 해부학적 자세로 3-40Hz 주파수를 순차적으로 증가시켜 진동부하를 가했을 경우 대퇴직근, 대퇴이두근, 전경골근, 비복근의 표면 근전도를 무진동 상태와 비교 분석한 결과 모든 부위에서 주파수에 따라 근이완 효과가 있었으며 16Hz에서 가장 이상적인 근이완 효과가 있는 것으로 나타났다. 특히 대퇴직근과 비복근의 경우 무진동 상태와 비교시 약 20-30%의 높은 근이완 효과가 이었다. 위의 결과는 전신진동운 동장치를 스포츠 및 재활 현장에서 사용할 경우 선수나 환자의 근 경직 및 경련을 예방할 수 있는 용도로 사용할 수 있다는 것을 말하며 추후 관절가동 범위(ROM) 및 유연성 향상을 위한 방안으로도 연구할 필요성이 있다는 것을 시사한다.