하지의 가속도 데이터를 이용한 뇌졸중 환자의 균형 측정

Abstract

Paralysis, impaired motor control, abnormal muscle tone and paresthesia due to stroke cause problems such as asymmetric posture, which directly affects the patient's gait and balance ability. It is very important to accurately conduct clinical assessment during or after stroke rehabilitation to prevent secondary risks. The aim of this study was to assess the difference in stability between the paretic and non-paretic leg of stroke patients. Five stroke patients were recruited, and the additional three subjects were healthy adults of similar age group. The subjects’ static and dynamic balance ability were measured using Berg balance scale (BBS). We used inertial measurement unit (IMU) sensors for acquire acceleration during physical activities. The temporal instability of step (TIS) ratio occurring during the subjects' physical activity was calculated using acceleration data. The average of TIS ratio of stroke patients for paretic side leg was larger than non-paretic side. The difference indicates that in the paretic side leg, the total power of the 3~8Hz band is relatively larger than the total power of the 0.5~3Hz band. In this study, it was found that the evaluation of dynamic balance behavior should be included in order to more accurately assess the motor capacity of stroke patients.