[논문]수준별 힘 안정성에 대한 EMG 변인 및 근육 특성의 관여

조현덕; 김맹규

doi:10.9718/jber.2023.44.5.336

수준별 힘 안정성에 대한 EMG 변인 및 근육 특성의 관여
Involvement of EMG Variables and Muscle Characteristics in Force Steadiness by Level 원문보기

Journal of biomedical engineering research : the official journal of the Korean Society of Medical & Biological Engineering, v.44 no.5, 2023년, pp.336 - 345

조현덕 (경북대학교 일반대학원 체육학과) , 김맹규 (경북대학교 사범대학 체육교육과)

Abstract ▼ AI-Helper

The present study was designed to evaluate changes in neuromuscular properties and the structural and qualitative characteristics of muscles during submaximal isometric contractions at low-to-relatively vigorous target forces and to determine their influence on force steadiness (FS). Thirteen young adult males performed submaximal isometric knee extensions at 10, 20, 50, and 70% of their maximal voluntary isometric contraction using their non-dominant legs. During submaximal contractions, we recorded force, EMG signals from vastus medialis (VM), vastus lateralis (VL), and rectus femoris (RF), and ultrasound images from the distal RF (dRF). Force and EMG standard deviation (SD) and coefficient of variation (CV) values were used to measure FS and EMG steadiness, respectively. Muscle thickness (MT), pennation angle (PA), echo intensity (EI), and texture features were calculated from ultrasound images to assess the structural and qualitative characteristics of the muscle. FS, neuromuscular properties, and texture features showed significant differences across different force levels. Additionally, there were significant differences in EMG_CV among the quadriceps at the 50% and 70% force levels. The results of correlation analysis revealed that FS had a significant relationship with EMG_CV in VM, VL, and RF, as well as with the texture features of dRF. This study's findings demonstrate that EMG steadiness and texture features are influenced by the magnitude of the target force and are closely related to FS, indicating their potential contribution to force output control.

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표/그림 (6)

그림 그림 1. 근전도 센서 부착 모습과 측정 장비가 적용된 연구 환경과 추출된 신호 예시 Fig. 1. Electromyography sensor attachment site and the experimental setup consisted of measurement equipment and example of recorded data ○, anterior superior iliac spine; △, rectus femoris; ◇, vastus lateralis; ♧, vastus medialis, □, patella; EMG, electromyography
그림 그림 2. 준최대 등척성수축 동안 근력 및 힘 안정성 변화 Fig. 2. Force steadiness at four target forces in knee extensor SD, standard deviation; CV, coefficient variation p values are calculated by one-way analysis of variance ANOVA. *p < 0.05, **p < 0.01 indicate significant differences between 10% and each target force, which were analyzed by Bonferroni's post hoc test
그림 그림 3. 준최대 등척성수축 동안 EMG 지표 변화 Fig. 3. Muscle activation and EMG steadiness at four target forces in knee extensor VM, vastus medialis; VL, vastus lateralis; RF, proximal rectus femoris; EMG, electromyography; RMS, root mean square; SD, standard deviation; CV, coefficient variation p values are calculated by one-way analysis of variance ANOVA. *p < 0.05, **p < 0.01 indicate significant differences of VM between 10% and each target force, which were analyzed by Bonferroni's post hoc test ^†p < 0.05, ††p < 0.01 indicate significant differences of VL between 10% and each target force, which were analyzed by Bonferroni's post hoc test ^‡p < 0.05, ‡‡p < 0.01 indicate significant differences of PF between 10% and each target force, which were analyzed by Bonferroni's post hoc test ^$p < 0.05 indicate significant differences between VM and VL, which were analyzed by Bonferroni's post hoc test ^#p < 0.05 indicate significant differences between VL and RF, which were analyzed by Bonferroni's post hoc test ^@p < 0.05 indicate significant differences between VM and RF, which were analyzed by Bonferroni's post hoc test
그림 그림 4. 준최대 등척성수축 동안 근육 구조 및 질적 특성 변화 Fig. 4. Structural properties and quality of distal rectus femoris at four target p values are calculated by one-way analysis of variance ANOVA. *p < 0.05 indicate significant differences between 10% and each target force, which were analyzed by Bonferroni's post hoc test.
그림 그림 5. 힘 안정성과 EMG 안정성 및 근육 질감 특성 간 관련성 Fig. 5. Correlations between force steadiness and EMG steadiness and texture features FS, force steadiness; SD, standard deviation; CV, coefficient variation; EMG, electromyography; ■: 10% FS_CV; ●: 20% FS_CV; ▲: 50% FS_CV; ◆: 70% FS_CV; □: 10% FS_SD; ○: 20% FS_SD; △: 50% FS_SD; ◇: 70% FS_SD
그림 그림 6. 힘 안정성과 각 근육의 EMG 안정성 간 관련성 Fig. 6. Correlations between force steadiness and EMG steadiness of quadriceps FS, force steadiness; SD, standard deviation; CV, coefficient variation; EMG, electromyography; VM, vastus medialis; VL, vastus lateralis; RF, rectus femoris; □: 10% FS – EMG steadiness; ○: 20% FS – EMG steadiness; △: 50% FS – EMG steadiness; ◇: 70% FS – EMG steadiness

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