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1	Trunk Muscle EMG in a Specially Designed Virtual Reality Motion Simulator Shafeie, Mohsen 07 July 2014 (has links) Virtual reality (VR) has become an important tool in the study of human balance. It has also been used as a training tool for seated balance and assistive mobility devices. The objective was to design a system that can be used to investigate the effect of VR on trunk muscles during perturbed sitting and perform a preliminary study with two subjects. A spherical system was designed that rotated 26º in the pitch and roll plane at three speeds. The corresponding muscle activity was recorded using EMG in the presence and absence of VR during perturbed sitting. The design was capable of performing the required motions. The results showed a maximum of 31.8% and a minimum of 3.66% muscle activity, relative to maximum voluntary contraction. Our findings suggested that our developed system was successfully able to detect a noticeable effect of VR under perturbed sitting on the subjects’ EMG responses. Electromyography EMG Perception Roll and Pitch Seated Balance Virtual Reality Simulation Phasic and Tonic activity Trunk Muscles Abdomen and Back Muscles Seated Posture 0541