The Analysis of Electromyography Pattern according to Foot Orthotic Type

Park, Jong Yul; Lee, Hong Jae; Moon, Gon Sung

Abstract

The purpose of this study was to analyze the muscle activities and gait pattern in lower limb depending on the orthotic type. Using electromyography (EMG), we evaluated muscle activities in 12 healthy men volunteered for this experiment. Surface electrodes were used to record the level of muscle activities in the tibialis anterior (TA), gastrocnemius (GCM), rectus femoris (RF), vastus lateral (VF), biceps femoris (BF) muscles during the gait. These signals were compared with % reference voluntary contraction (%RVC) which was normalized by integrated EMG (IEMG). The Gait cycle were divided into seven phases: loading response (LR), mid stance, terminal stance, pre swing (PS), initial swing (IS), mid swing, terminal swing. The results can be summarized as follows; there were increase of TA and GCM muscle during loading response phase & mid stance phase. There were increase of TA and BF muscle during terminal stance phase, pre swing phase, initial swing phase, mid swing phase and terminal swing phase.