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논문 기본 정보

자료유형
학술저널
저자정보
Keita Nakayama (University of Tsukuba) Masataka Sakane (University of Tsukuba) Susumu Ejima (Japan Automobile Research Institute) Daisuke Ito (Japan Automobile Research Institute) Tomofumi Nishino (University of Tsukuba) Sou Kitajima (Japan Automobile Research Institute) Masashi Yamazaki (University of Tsukuba)
저널정보
대한척추외과학회 Asian Spine Journal Asian Spine Journal Vol.9 No.6
발행연도
2015.1
수록면
876 - 883 (8page)

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Study Design: Prospective experimental study on humans. Purpose: To determine whether postural differences during a low-speed impact are observed in the sagittal and axial views, particularly in a relaxed state. Overview of Literature: Three-dimensional motion capture systems have been used to analyze posture and head-neck-torso kinematics in humans during a simulated low-speed impact, yet little research has focused on the axial view. Since a seatbelt asymmetrically stabilizes a driver’s right shoulder and left lower waist into the seat, it potentially creates movement in the axial view. Methods: Three healthy adult men participated in the experimental series, which used a low-speed sled system. The acceleration pulse created a full sine shape with a maximum acceleration of 8.0 m/s2 at 500 ms, during which the kinematics were evaluated in relaxed and tensed states. The three-dimensional motion capture system used eight markers to record and analyze body movement and head-neck-torso kinematics in the sagittal and axial views during the low-speed impact. Head and trunk rotation angles were also calculated. Results: Larger movements were observed in the relaxed than in the tensed state in the sagittal view. The cervical and thoracic spine flexed and extended, respectively, in the relaxed state. In the axial view, larger movements were also observed in the relaxed state than in the tensed state, and the left shoulder rotated. Conclusions: During simulated frontal impact, the rotation angle between the head and trunk was significantly larger in the relaxed state. Therefore, we recommend also observing movement in the axial view during impact tests.

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