Raw values of sEMG signals and elbow joint angle of a single subject.

(A,B,C,D) show sEMG signals for the upper posture. (E,F,G,H) show sEMG signals for the lower posture. Biceps sEMGs are shown in shades of red and triceps sEMGs in shades of blue. Left column (A,C,E,G) show sEMG signals from innermost muscle heads in darker shades and right column (B,D,F,H) show sEMG signals from outermost muscle heads in lighter shades of the respective color. On the right axis the elbow angle (θ) is plotted in green. θ = 0° means that the arm is fully extended. (C,D,G,H) each show a time frame of 0.3 s from the respective signals arranged above.