The behavior of the average normalized muscle EMGs.

<p>(A) Average normalized muscle EMG anterior deltoid, posterior deltoids, biceps, and triceps. The gradient and intercept of individual muscles are (−0.005, 0.315), (0.004,0.426), (0.001, 0.133), and (−0.013, 0.995) for anterior deltoid, posterior deltoid, biceps, and triceps respectively, (B) Frontal and dorsal muscle ratio: M1- biceps triceps muscle ratio, M2- anterior deltoid posterior deltoid muscle ratio, and (C) The behavior of this cost indicator <i>J</i> of the 2^nd order best fit curve for average EMGs of all four muscles of the ten subjects across trials.