Fig. 3From: Quantitative description of upper extremity function and activity of people with spinal muscular atrophyNormalized sEMG amplitudes. Normalized sEMG amplitudes of the Trapezius, Biceps Brachii, Triceps Brachii, Deltoid, and forearm extensor muscles for 3 different upper extremity movements shown for different disease categories. A: drinking from a glass filled with 200 g; B: moving a 100 g weight over the tabletop; C: tracing a path with a pencil. Note: Drinking from a glass filled with 200 g could not be performed by the participants in category 3Back to article page