편측 부하를 동반한 스쿼트 운동 시 건강한 성인의 중둔근과 내측광근의 근활성도 = Gluteus Medius and Vastus Medialis Muscle Activity During Squat Exercise with Unilateral Loading in Healthy Subject

다국어 초록 (Multilingual Abstract)

Background: Due to weakened vastus medialis, knee pains such as patellofemoral syndrome may occur while weakened gluteus medius may cause back pain and the balance problem. Purpose: The purpose of this study was to compare the impact of high-bar-squat (HBS) and modified-front-squat (MFS) with loading weight (or without unloading wight) on the dominant hand side on the muscle activities in healthy individuals (11 males and 18 females). Methods: All subjects peformed the two type squat with a 5% of their own body weight in the random order of HBS and MFS in combination with load or unload. The %maximal voluntary isometric contraction (%MVIC) during the ascent and descent of the squats were measured.
Result: During the ascent and descent phase in the HBS accompanied by loading on the one side of the wrist area, a significant difference of increasing vastus medialis (VM) was observed in males and females.
n the MFS, a significant increasing was observed in males and females only during the ascent phase. In case of gluteus medius (GM), although both the HBS and MFS did not show a significant difference in males and females, the muscle activity tended to increase if weight loading was applied on the side. Conclusion: These results show that muscle activity was significantly different in most of postures upon weight loading on the wrist area in male subjects while female subjects failed to maintain the posture since they could not withstand the weight on the upper limb,
leading to non-significance in the results. It is expected that these results can provide useful data for the treatment of the weakened VM or the patients with patellofemoral syndrome.