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http://dx.doi.org/10.12674/ptk.2022.29.2.140

Effect of Electrical Muscle Stimulation Training With and Without Superimposed Voluntary Contraction on Rectus Femoris and Vastus Intermedius Thickness and Knee Extension Strength  

Weon, Young-soo (Department of Physical Therapy, The Graduate School, Yonsei University)
Kim, Jun-hee (Kinetic Ergocise Based on Movement Analysis Laboratory)
Gwak, Gyeong-tae (Kinetic Ergocise Based on Movement Analysis Laboratory)
Lee, Do-eun (Department of Physical Therapy, The Graduate School, Yonsei University)
Kwon, Oh-yun (Kinetic Ergocise Based on Movement Analysis Laboratory)
Publication Information
Physical Therapy Korea / v.29, no.2, 2022 , pp. 140-146 More about this Journal
Abstract
Background: The superimposed technique (ST) involves the application of electrical muscle stimulation (EMS) during voluntary muscle action. The physiological effects attributed to each stimulus may be accumulated by the ST. Although various EMS devices for the quadriceps muscle are being marketed to the general public, there is still a lack of research on whether ST training can provide significant advantages for improving quadriceps muscle strength or thickness compared with EMS alone. Objective: To compare the effects of eight weeks of ST and EMS on the thicknesses of the rectus femoris (RF) and vastus intermedius (VI) muscles and knee extension strength. Methods: Thirty healthy subjects were recruited and randomly assigned to either the ST or EMS groups. The participants underwent ST or EMS training for eight weeks. In all participants, the thicknesses of the RF and VI muscles were measured before and after the 8-week intervention by ultrasonography, and quadriceps muscle strength was measured using the Smart KEMA tension sensor (KOREATECH Co., Ltd.). Results: There were significant differences in the pre- and post-intervention thicknesses of the RF and VI muscles as well as the quadriceps muscle strength in both groups (p < 0.05). RF thickness was significantly greater in the ST group (F = 4.294, p = 0.048), but there was no significant difference in VI thickness (F = 0.234, p = 0.632) or knee extension strength (F = 0.775, p = 0.386). Conclusion: EMS can be used to improve quadriceps muscle strength and RF and VI muscle thickness, and ST can be used to improve RF thickness in the context of athletic training and fitness.
Keywords
Muscle strength; Quadriceps muscle; Ultrasonography;
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