Kronik İnmeli Hastalarda Latissimus Dorsi Kas Segmentlerinin Fonksiyonel Uzanma Aktivitesi Sırasında Aktivasyonunun İncelenmesi

Abstract

The aim of this study was to compare the latissimus dorsi muscle segments activation levels in different reaching distances and directions during functional reaching activity between subjects with chronic stroke and healthy. Twelve chronic stroke subjects with a mean age of 54.45 ± 3.45 and 11 healthy subjects with a mean age of 54.50 ± 5.78 were included in the study. Surface electromyography (EMG) was used to record the muscle activation levels of Anterior Deltoid (AD), Erector Spina (ES) and six segments of the Latissimus Dorsi (LD), LD1-LD6, during reaching activity in different reach distances (arm length distance, 125% of arm length distance and maksimum distance) and in different planes (sagittal and scapular). EMG muscle activation levels were compared between affected side of chronic stroke subject and the dominant side of healthy subjects. In chronic stroke subjects, the activation levels of LD muscle segments during reaching in arm length distance were similar in both planes except for the LD3 muscle segment in the scapular plane (p>0.05). The activation level of LD1, LD2, and LD5 muscle segments in the sagittal plane and LD1, LD2, LD3 and LD5 muscle segments in the scapular plane was higher compared to healthy subjects in 125% of the arm length (p<0.05). The activation level of the LD1 muscle segment in the maximum distance in both the sagittal and scapular planes was found to be higher than healthy subjects (p<0.05). In addition, six segments of the LD muscle were found to have a varying activation level depending on the distance and direction of reaching in both the healthy and chronic stroke groups (p<0.05). During reaching, LD muscle segments showed different activation levels in terms of motor tasks. In chronic stroke subjects, the increase in LD muscle segments activation levels contribute to both shoulder and trunk stabilization causes subjects to perform activity by exerting more effort. This study will guide the creation of targeted interventions in stroke rehabilitation.