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MR 댐퍼를 적용한 불안정판에서 하지 근력 훈련이 근 활성도에 미치는 영향 분석
최윤정,박용군,권대규,김동욱,김정자,김남균,Choi, Y.J.,Piao, Y.J.,Kwon, T.K.,Kim, D.W.,Kim, J.J.,Kim, N.G. 대한의용생체공학회 2007 의공학회지 Vol.28 No.5
Adequate postural control depends on the spatial and temporal integration of vestibular, visual, and somatosensory information. Especially, the musculoskeletal function is essential to maintain the postural control. The experimental studies was performed on the muscular activities in the lower extremities during maintaining and moving exercises on an unstable platform with Magneto Rheological(MR) dampers. The unstable platform of the developed system was controlled by electric currents to the MR dampers. A subject executed the maintaining and moving exercises which are presented through the display monitor. The electromyographies of the eight muscles in lower extremities were recorded and analyzed in the time and the frequency domain: the muscles of interest were rectus femoris(RF), biceps femoris(BF), tensor fasciae latae(TFL), vastus lateralis(VL), vastus medialis(VM), gastrocnemius(Ga), tibialis anterior(TA), Soleus(So). The experimental results showed that the muscular activities differed in the four moving exercises and the nine maintaining exercises. For the anterior-posterior pattern, the TA showed highest activities; for the left-right pattern, the TFL; for the 45, $-45^{\circ}$ pattern, the TFL and TA. Also, the rate of the increase in the muscular activities were affected by the condition of the unstable platform with MR dampers for the maintaining and moving exercises. The experimental results suggest that the choice of different maintaining and moving exercises could selectively train different muscles in various intensity. Futhermore, the findings suggested that the training using this system can improve the ability of postural control.
지지면의 수평 진동에 따른 동적 자세 제어 특성에 관한 연구
오가영,박용군,권대규,김남균,Oh, G.Y.,Piao, Y.J.,Kwon, T.K.,Kim, N.G. 대한의용생체공학회 2009 의공학회지 Vol.30 No.6
This paper investigated the effects of dynamic postural control for maintaining upright standing on a support surface during continuous sinusoidal horizontal translation in anterior-posterior direction. 15 healthy young subjects participated in this experiment. The analysis of body movement was analyzed using Ariel Performance Analysis System. Motion pattern was analyzed by seven markers on subject's body. Position of markers were head, chest, hip, right knee, left knee, right ankle and left ankle. Seven different frequencies of support surface were employed ; 0.1, 0.25, 0.5, 0.75, 1, 1.5 and 2Hz at 2cm of moving path of motionbase. The experiments were performed dynamic postural reponses at the condition of eye open. The results showed that median frequency of the knee, ankle were increased in all frequency bands. Following the frequency of perturbation increased, postural control strategy was changed from ankle strategy to combined strategy. The experiment results could be applied to the dynamic postural training for the elderly and the rehabilitation training for the patients to improving the ability of postural control.
지지면의 수평 진동에 대한 동적 자세응답 특성에 관한 연구
오가영(G. Y. Oh),유미(M. Yu),박용군(Y. J. Piao),김경(K. Kim),고명환(M. H. Ko),권대규(T. K. Kwon) 한국재활복지공학회 2010 한국재활복지공학회 학술대회논문집 Vol.2010 No.11
This paper investigated the effects of dynamic postural response for maintaining upright standing on a support surface during horizontal vibration in anterior-posterior and medial-lateral direction. Seven healthy young subjects participated in this study. Postural control was analyzed by the measurement of COP (center of pressure) sway. Three different frequencies and two different amplitudes of support surface were employed: O.6Hz, 102Hz, 1.8Hz and 204Hz at 1cm, 3cm. The experiments were performed dynamic postural reponses at the condition of eye open and close. The electrornyographic signals of the four muscles in lower extremities were recorded and analyzed in the frequency domain: the muscles of interest were rectus femoris (RF), biceps femoris (BF), gastrocnemius (Ga), tibialis anterior (T A). The experimental results showed the difference of muscular activities at the different frequencies, amplitudes and the vibration directions of the support surface. For the anterior-posterior and medial-lateral direction, the Ga showed highest activities. Also, the rate of the increase in the muscular activities was affected by the frequency and amplitude. This paper could be applied to the dynamic postural training for the elderly and the rehabilitation training for the patients to improving the ability of postural control.