EMG activity of arms muscles and body movement during chucking in lathebetween expert and non-expert

Abstract

The subjects were three men differential experience of lathe processing such as 87,500 h, 6,300 h and 384 h on 87, 32 and 40 years old respectively. The attendees were affixed fourteen reflective markers for motion analysis and ten surface electrodes on the muscles of arms. The chucking movement did not leaned the body and used the center of the body to be a center of movement characterized the muscle contraction of expert on bilateral muscle of Flexor carpi radialis and Triceps bracii and then they still used the right Extensor carpi radialis longus, right Biceps brachii and left Deltoid. The abnormal twisting movement by bending the body to the left side and leaned the left knee down indicated the experts still contracted the muscle as like the first movement. The muscle energy usages of the experts had higher than the non-expert whom took a muscle continuously contraction along time.