Neuromusuclar Adaptations in the Rheumatoid Arthritis Disease

"The Timed Up and Go test; Maximal knee-extensor muscle strength (isometric and concentric tests) was measured with a Biodex System 3 dynamometer; A B-mode ultrasonography system with a linear-array probe (60 mm, 7.5 MHz) was used to determine VL and RF muscle thickness, pennation angle, fascicle length and tendon CSA. Measurements were obtained with the volunteer seated in the dynamometer, during isometric contraction at 90° of knee flexion.~An 8-channel EMG system was synchronized with the dynamometer through a Windaq data acquisition system and used to evaluate the vastus lateralis and rectus femoris electrical activity during isometric knee-extensor tests."