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Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành y học dành cho các bạn tham khảo đề tài: The relation between neuromechanical parameters and Ashworth score in stroke patients | de Vlugt et al. Journal of NeuroEngineering and Rehabilitation 2010 7 35 http www.jneuroengrehab.eom content 7 1 35 l dl JOURNAL OF NEUROENGINEERING NCR AND REHABILITATION RESEARCH Open Access The relation between neuromechanical parameters and Ashworth score in stroke patients 1 2 3 2 2 1 Erwin de Vlugt Jurriaan H de Groot Kim E Schenkeveld J Hans Arendzen Frans CT van der Helm Carel GM Meskers2 3 Abstract Background Quantifying increased joint resistance into its contributing factors i.e. stiffness and viscosity hypertonia and stretch reflexes hyperreflexia is important in stroke rehabilitation. Existing clinical tests such as the Ashworth Score do not permit discrimination between underlying tissue and reflexive neural properties. We propose an instrumented identification paradigm for early and tailor made interventions. Methods Ramp-and-Hold ankle dorsiflexion rotations of various durations were imposed using a manipulator. A one second rotation over the Range of Motion similar to the Ashworth condition was included. Tissue stiffness and viscosity and reflexive torque were estimated using a nonlinear model and compared to the Ashworth Score of nineteen stroke patients and seven controls. Results Ankle viscosity moderately increased stiffness was indifferent and reflexive torque decreased with movement duration. Compared to controls patients with an Ashworth Score of 1 and 2 were significantly stiffer and had higher viscosity and patients with an Ashworth Score of 2 showed higher reflexive torque. For the one second movement stiffness correlated to Ashworth Score r2 0.51 F 32.7 p 0.001 with minor uncorrelated reflexive torque. Reflexive torque correlated to Ashworth Score at shorter movement durations r2 0.25 F 11 p 0.002 . Conclusion Stroke patients were distinguished from controls by tissue stiffness and viscosity and to a lesser extent by reflexive torque from the soleus muscle. These parameters were also sensitive to discriminate patients clinically graded .
