Effects of squats accompanied by hip joint adduction on the selective activity of the vastus medialis oblique

Abstract

[Purpose] This study evaluated the effective selective activation method of the vastus medialis oblique for knee joint stabilization in patients with patellofemoral pain syndrome. [Subjects and Methods] Fifteen healthy college students (9 males, 6 females); mean age, height, and weight: 22.2 years, 167.8 cm, and 61.4 kg, respectively) participated. The knee angle was held at 60°. Muscle activities were measured once each during an ordinary squat and a squat accompanied by hip joint adduction. The muscle activities of the vastus medialis oblique and vastus lateralis were measured by electromyography for five seconds while maintaining 60° knee flexion. Electromyography signals were obtained at a sampling rate of 1,000 Hz and band pass filtering at 20–50 Hz. The obtained raw root mean square was divided by the maximal voluntary isometric contraction and expressed as a percentage. The selective activity of the vastus medialis oblique was assessed according to the muscle activity ratio of the vastus medialis oblique to the vastus lateralis. [Results] The activity ratio of the vastus medialis oblique was higher during a squat with hip joint adduction than without. [Conclusion] A squat accompanied by hip joint adduction is effective for the selective activation of the vastus medialis oblique.

Atividade elétrica muscular de vasto medial, vasto medial oblí­quo, vasto lateral, glúteo médio e tensor da fáscia lata no exercí­cio footwork realizado no reformer segundo o método Pilates

“…Uma revisão sistemática conduzida por Smith [37] em 2008 sugere que não seja possível uma ativação preferencial do VMO, uma vez que dos 20 estudos analisados, apenas três apresentaram maiores valores de ativação, cada um em uma situação diferente. Posteriormente, Irish [38] e Hyong [39] encontraram maiores valores de proporção VMO:VL, no agachamento associado à adução de quadril. Contrariando os dados de Boling [40], que não encontrou diferença na associação de adução de quadril no agachamento e os do presente estudo, no footwork com adução de quadril.…”

Analysis of vastus lateralis and vastus medialis oblique muscle activation during squat exercise with and without a variety of tools in normal adults

“…PFPS is usually described as a common condition related to knee disorder, especially in young active females and athletes 8 ) . The symptoms of PFPS mainly appear when ascending stairs or sitting with the knee flexed for a long period of time, and persistence of symptoms can influence the development of osteoarthritis 7 , 11 , 12 ) .…”

Effect of leg press training on patellar realignment in patients with patellofemoral pain

“…It should be noted that the hip adduction load was fixed (i.e., 50 N) in the present study, and VMO activation may vary with different levels of hip adduction load 29 ) . On the other hand, squat exercise with hip adduction offers an alternative method of strengthening the VMO 29 , 30 ) .…”