Pattern of Muscle Activation During Sit to Stand Task in Feet Forward with 80° Knee Flexion using Surface EMG

Abstract

The sit-to-stand (STS) in feet forward is one type of STS with a characteristic of delayed contraction of Tibialis anterior. Surface EMG (sEMG) signals are recorded by non-invasive electrodes and are preferably used to obtain information about the time or intensity of superficial muscle activation. This study aims to find the pattern of muscle activation when STS in feet forward. This is a retrospective study using sEMG for the pattern of muscle activation of 14 males and 14 females in Hasan Sadikin General Hospital Bandung Indonesia, in March 2019. The average height, weight, body fat, and fat-free mass in men were significantly different from women participants. The muscle activation of muscle group stabilizer (Rectus Femoris (RF) and Biceps femoris lateral (BFL)) is bigger than muscle group sequence (Tibialis anterior (TA) and Gastrocnemius medialis (GM) during STS in this research. Rectus femoris was the muscle that had the highest mean maximum force in every STS phase. The mean maximum force of RF, BFL, and GM in Phase II was the highest compared to another phase. On the other hand, the mean maximum force of TA was the highest in Phase V. Feet Forward with 80° knee flexion is the strategy foot positioning during sit to stand to increase the force of sequence muscle group than stabilizer muscle group