다양한 속도의 리칭동작에서의 상지 근육간 동적 및 정적 협응 (Phasic and Tonic Coordination among Upper-limb Muscles in Different Speeds of Reaching Movement)

서지정보

· 발행기관 : 한국정밀공학회
· 수록지 정보 : 한국정밀공학회지 / 42권 / 2호 / 105 ~ 120페이지
· 저자명 : 김민재, 김주희, 신현수, 이승민, 김나연, 엄광문

초록

In the rehabilitation of upper limb function impaired by stroke, facilitating the coordinated activation of multiple muscles isdesirable. This study aims to analyze the coordination patterns of the tonic and phasic components of EMG during areaching task and to investigate how the phasic component changes in relation to reaching speed. The analysis focusedon the shoulder and elbow joints. EMG was recorded at five different speeds, with the slowest speed selected to representthe tonic component. The tonic component was then removed from the total EMG at the other four speeds to extract thephasic component. Correlation coefficients were calculated between the tonic component and joint angles, as well asbetween the phasic component and joint angular accelerations. For the tonic component, as joint angle increased duringreaching, muscle activation also increased to counteract gravitational moments and enhance joint stiffness. For the phasiccomponent, as reaching speed increased, the correlation between acceleration-deceleration patterns and muscle activationalso increased. This suggests a greater synergistic contraction for enhanced acceleration and deceleration, as well asincreased antagonistic contraction to ensure dynamic stability during faster movements.

영어초록

In the rehabilitation of upper limb function impaired by stroke, facilitating the coordinated activation of multiple muscles isdesirable. This study aims to analyze the coordination patterns of the tonic and phasic components of EMG during areaching task and to investigate how the phasic component changes in relation to reaching speed. The analysis focusedon the shoulder and elbow joints. EMG was recorded at five different speeds, with the slowest speed selected to representthe tonic component. The tonic component was then removed from the total EMG at the other four speeds to extract thephasic component. Correlation coefficients were calculated between the tonic component and joint angles, as well asbetween the phasic component and joint angular accelerations. For the tonic component, as joint angle increased duringreaching, muscle activation also increased to counteract gravitational moments and enhance joint stiffness. For the phasiccomponent, as reaching speed increased, the correlation between acceleration-deceleration patterns and muscle activationalso increased. This suggests a greater synergistic contraction for enhanced acceleration and deceleration, as well asincreased antagonistic contraction to ensure dynamic stability during faster movements.

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