http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : Kisik Tae (검색결과 2 건)
- 무료
- 기관 내 무료
- 유료
-
The balance recovery mechanisms against unexpected forward perturbation.
Hwang, Sungjae,Tae, Kisik,Sohn, Ryanghee,Kim, Jungyoon,Son, Jongsang,Kim, Youngho Pergamon Press [etc.] 2009 Annals of biomedical engineering Vol.37 No.8
<P>Falls are one of the main concerns of the elderly. Proper postural adjustments to maintain balance involve the activation of appropriate muscles to produce force and to relocate the center of body mass (CoM). In this study, biomechanical aspects of dynamic postural responses against forward perturbations were experimentally determined by simultaneous measurements of joint angles and EMG activations. Thirteen young and healthy volunteers took turns standing on a flat platform, and were directed to move in the forward direction by an AC servo-motor set at two different speeds (0.1 and 0.2 m/s). Joint motions were recorded, and they followed the sequence of ankle dorsiflexion, knee flexion, and then hip flexion during the later acceleration phase (AP) in order to maintain postural balance against forward perturbation. Tibialis anterior for the ankle dorsiflexion and biceps femoris for the knee flexion were activated during the second half of the AP as the primary muscles to recover balance. In addition, gastrocnemius, which was related to ankle plantarflexion, and rectus femoris, which was related to knee extension, were activated to maintain balance. Movements of the center of plantar pressure and ground reaction forces in fast-speed perturbation were significantly larger than those in slow-speed perturbation. As a result, the ankle strategy was used for slow-speed perturbation, but the mixed strategy consisting of both ankles and hip were used for fast-speed perturbation.</P>
-
The Motion Analysis about the Balance Recovery Mechanisms against the Forward Perturbation
Sungjae Hwang,Hueseok Choi,Kisik Tae,Youngho Kim 대한전자공학회 2007 ITC-CSCC :International Technical Conference on Ci Vol.2007 No.7
In this paper, biomechanical aspects of dynamic postural responses against forward perturbations were experimentally determined by simultaneous measurements of joint angles, linear accelerations, EMG activations, CoP movements and ground reaction forces(GRF). The sequence of joint motions due to the forward perturabation was in the order of ankle dorsiflexion, knee flexion and then hip flexion during the second half of the acceleration phase. Forward accerlerations were found both at the heel and the sacrum during the second half of the acceleration phase and the early, constant speed phase. Tibialis anterior(TA) for ankle dorsiflexion and biceps femoris(BF) for knee flexion, the primary muscle to recover balances against the forward perturbation, was activated during the half of acceleration phase. Ankle strategy was used for slow-speed perturbation, but mixed strategy of both ankle and hip used for the fast-speed perturbation. In addition, speed and magnitude of the perturbation influenced the postural response.
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
