Following stroke some subjects lose independent control of muscle groups, resulting in coupled joint movements that are often inappropriate for the desired task. These coupled joint movements, or synergies, are prevalent in the upper limbs and cause such impairments as reduced reaching ability. However, the role of synergies in the lower limbs are not well understood. The secondary joint torque profiles of stroke subjects were compared to healthy subjects in an isometric standing task to see what role synergies play in simple lower limb tasks that do not involve coordinated movements. It was found that stroke subjects do not adopt abnormal synergy patterns and the major contributor to lower limb deficits is weakness. The torque profiles of stroke and healthy subjects were compared as both groups walk in the Lokomat robotic orthosis to see what role synergies play in complex lower limb tasks that do involve coordinated movements. It was found that despite being guided through similar movements, stroke subjects do not generate healthy joint torques while walking in the Lokomat. Additionally, it was found that stroke subjects did not couple their joint torques into synergies, even when it was beneficial to do so. The results found here suggest that abnormal synergy patterns do not play a role in the lower limb deficits following stroke.First of which is the accuracy of the measuring techniques used, and secondly is the role of manual physical therapist assistance during training. Kinematic measures such as angular displacement were qualitatively observed off of video tape, anbsp;...
|Title||:||Quantification of Static and Dynamic Muscle Synergy Patterns in the Paretic Leg of Stroke Patients|
|Author||:||Nathan Daniel Neckel|
|Publisher||:||ProQuest - 2008|