Departmental Bulletin Paper 小型センシングデバイスを用いた動作分析手法の開発 -モーションセンサによる歩行時体幹動揺の評価-
Development of the Motion Analysis Technique Using Small Sensing Device -Evaluation of the Trunk Sway During Gait Using Motion Sensors-
Development of the Motion Analysis Technique Using Small Sensing Device -Evaluation of the Trunk Sway During Gait Using Motion Sensors-

柊, 幸伸  ,  中村, 浩  ,  川崎, 翼  ,  兎澤, 良輔  ,  高木, 亮輔

Description
本研究の目的は,小型モーションセンサの技術で歩行時の体幹運動の変位とその軌跡長を計測し,健常学生と高齢者の歩行時の体幹動揺の特徴を明らかにすることであった.対象は,健常大学生27名,および地域在住の高齢者20名であった.歩行時の体幹動揺の計測にはモーションセンサを用い,骨盤部背側と上部体幹部背側に固定した.計測課題は歩行とし,歩行速度は快適速度と努力速度の2種類とした.結果,学生群の努力速度では快適速度に比べ,骨盤部の動揺は大きくなり上部体幹部の動揺は小さくなった.高齢者群では努力歩行で,骨盤部,上部体幹部ともに動揺は大きくなる傾向が認められた.快適速度での1歩行周期に要する時間は,学生群,高齢者群のどちらも同じ時間であった.学生群と高齢者群では歩行速度を上げる戦略が異なり,体幹の動揺に相違が出ると考えた.歩行時の骨盤部と上部体幹部の変位量を計測し歩行分析をする今回の手法には新規性があり,簡便で拘束の少ない分析手法である.この動作分析手法は,臨床応用可能な評価手法であると考えた.
The purpose of this study was to measure the displacement and the trajectory length of the trunk sway during gait using small motion sensors, and to clarify its characteristics. The subjects were 27 healthy university students and 20 elderly people. Two motion sensors were used in this study. One sensor was attached to the back side of the pelvic, and the other was attached to the back side of the upper trunk. Subjects performed a comfortable speed gait for 10 seconds and a maximum speed gait for 10 seconds. In the student group, the displacement and the trajectory length of the trunk sway during the maximum speed gait was increased in the pelvic, and was decreased in the upper trunk. In the elderly group, the displacement and the trajectory length of the trunk sway during the maximum speed gait was increased in both the pelvic and the upper trunk. The time of one gait cycle in comfortable speed gait was the same for both the student group and the elderly group. As the strategies to increase gait speed were different between the student group and the elderly group, the difference in trunk sway was detected. This measurement technique was easy and useful for motion analysis, and it would be applicable in clinical settings.
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