128. Assessment of the Plantarflexor Muscle Tone in Chronic Stroke and Spinal Cord Injury Subjects Using the Spasticity Index Dr. Sylvie Nadeau (Montreal,Quebec,Canada),C. Goulet (Hong Kong,PRC),A. B. Arsenault (Montreal,Quebec,Canada),D. Gravel (Montreal,Quebec,Canada),D. Bourbonnais (Montreal,Quebec,Canada),and Y. Lepage (Montreal,Quebec,Canada