![]() Some assessment methods, such as the Melbourne Assessment of Unilateral Upper Limb Function ( Johnson et al., 1994), the Shriners Hospital for Children Upper Extremity Evaluation (SHUEE Davids et al., 2006), and Fugl-Meyer Assessment (FMA Fugl-Meyer et al., 1975) scale were frequently used in the clinic for the upper limb function assessment of CP patients ( Krebs et al., 2009). Apart from measuring the whole body motor function, the assessment of body partial motor function was also developing gradually. Nowadays, the Gross Motor Function Measure (GMFM Russell et al., 1989) has been widely adopted to measure the gross motor function of the CP children in clinical, particularly the functional changes over time. Therefore, accurate assessment of the motion dysfunction is very important. In clinical treatment, clinicians often establish personalized therapeutic schedule for CP patients according to the severity of their abnormalities. Patients with CP often suffer from neurological and physical abnormalities ( Rosenbaum et al., 2007). This illness is caused by non-progressive insult to the developing brain ( Bax et al., 2005 Butler, 2011). The proposed assessment method can serve as a promising approach to quantify the abnormality of muscle synergies, thus offering potential to derive a physiologically based quantitative index for assessing upper limb motor function in CP clinical diagnosis and rehabilitation.Ĭerebral palsy (CP) describes a heterogeneous group of disorders affecting the development of movement and posture. The experimental results demonstrated that these UPA metrics were able to assess upper limb motor function comprehensively and effectively. Seven upper limb assessment ( UPA) metrics, which were defined as the combinations of synergy structure similarity coefficients of three tasks, were proposed to assess the upper limb motor function of CP children. In view of neuromuscular control strategy differences, three synergy-related parameters were proposed and synergy structure similarity coefficient was found to have high ability in depicting the inter-subject similarity within task and the intra-subject similarity between tasks. Whereas, fewer mature synergies were recruited in CP group, and many abnormal synergy structures specific to CP group appeared. ![]() ![]() For each subject in TD group, four muscle synergies were extracted in each task. Non-negative matrix factorization algorithm was used to extract muscle synergies and the corresponding activation patterns during three similar tasks. Fourteen CP children and 10 typically developed (TD) children were recruited to perform three similar upper limb motion tasks related to the movements of elbow and shoulder joints, and surface electromyographic (sEMG) signals were recorded from 10 upper arm and shoulder muscles involved in the defined tasks. The goal of this study is to explore an objective and effective method to assess the upper limb motor dysfunction of cerebral palsy (CP) children from the aspect of muscle synergy analysis. Muscle synergies are considered to be building blocks underlying motor behaviors. 2Department of Children's Neurorehabilitation, First Affiliated Hospital of Anhui Medical University, Hefei, China. ![]()
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