The Quantitative Difference in Muscle Activity within the Rectus Femoris Muscle
2023 Volume 3 Issue 1 Pages 21-26
Details
2023 Volume 3 Issue 1 Pages 21-26
Objective: The purpose of this study was to evaluate the quantitative differences in muscle activity within the rectus femoris (RF) muscle.
Methods: The subjects were eight healthy males. Maximum voluntary contraction of the RF muscle from 0 to 100% for hip flexion (HF) and knee extension (KE) was performed. Electromyograms (EMG) were obtained using a four surface EMG of the distal and proximal parts of the RF muscle.
Results: There were no significant differences in the gradual increase in integrated EMG (IEMG) between HF and KE between 1ch, 2ch, 3ch and 4ch on the proximal part of the RF muscle. In the distal parts of the muscle, on the other hand, IEMG increase during KE was significantly greater than that during HF. The HF/KE ratio in the distal RF muscle was significantly lower than that in 1ch and 2ch.
Conclusion: We observed no differences in muscle activity in the proximal parts of the RF muscle between KE and HF. However, distal muscle activity was found to be lower with HF than KE.
