Conclusions: The performance of EMG pattern-recognition based method in classifying movements strongly
depends on arm positions. This dependency is a little stronger in intact arm than in amputated arm, which
suggests that the investigations associated with practical use of a myoelectric prosthesis should use the limb
amputees as subjects instead of using able-body subjects. The two-stage cascade classifier mode with ACC-MMG
for limb position identification and EMG for limb motion classification may be a promising way to reduce the effect
of limb position variation on classification performance.