عنوان مقاله [English]
Background and Aim: Considering the important role of vasus medialise oblique in pattelofemoral joint function and the necessity of designing appropriative exercises for it, the purpose of the present study was to investigate electromyography activity of quadriceps muscle in deferent hip rotation position in closed kinetic chain in healthy women.
Materials and Methods: The current quasi-experimental study was conducted on 35 healthy women chosen via simple nonrandomal sampling. Electromyography activity rectus femoris, vastus medialise oblique, and vastus lateralise were recorded with surface electrodes in 15, 30, and 45 degrees of internal and external rotation and neutral position of hip with participants risen onto their toes. Normalized data was analyzed in excel.
Results: The outcomes of repeated measure analysis revelaed that there was a meaningful deference in 15 degree of external rotation (p=0.039), neutral position (p=0.003), 15 degree internal rotation (p=0.003), and at the end of internal position (p=0.015). Pair wise comparison between muscles activity and bonferroni showed vastus lateralise activity in 15 degree external rotation (p=0.039), neutral position (p=0.003), 15 degree internal rotation (p=0.003), and at the end of internal position (p=0.015) was more than rectus femoris muscle. Other pair comparisons between vastus medialis oblique and vastus lateralise, and vastuse medialise oblique and rectus femoris were not observed to be meaningful.
Conclusion: Based on the outcomes of the present study, the average vastus lateralise activity was the highest in all positions and the position studied in the current study did not lead to increase in vastus medialise oblique as a medial dynamic stabilizer compared to vastus lateralise.
11. Coqueiro KR, Bevilaqua-Grossi D, Bérzin F, Soares AB, Candolo C, et al. Analysis on the activation of the VMO and VLL muscles during semisquat exercises with and without hip adduction in individuals with patellofemoral pain syndrome. J Electromyogr Kinesiol. 200;15(6):596-603.##
13. Blacker LH, Enjuanes N, Smith P, Worthington D. The effect of limb position, exercise mode and contraction type on overall activity of VMO and VL. Physical Therapy in sport. 2006;7(2):87-92##
14. Elton CT Ng, Mara PY Chui, Aggie YK Siu, Vaniel WN Yam, Gabriel YF Ng.
Ankle positioning and knee perturbation affect temporal recruitment of the vasti muscles in people with patellofemoral pain. Physiotherapy 2011;97(1):65-70.##
15. Serra F, Cabral C, Berzin F , Candolo C . Effect of tibia rotation on the electromyographical activity of the vastus medialis oblique and vastus lateralis longus muscles during isometric leg press. Phys Ther Sport. 2005; 6(1):15-23. ##
16. Irish SE, Millward AJ, Wride J, Haas BM, Shum GL. The effect of CKC exercise and OKC exercise on the muscle activity of vastus medialis oblique and vastus lateralis. J Strength Cond Res. 2010;24(5):1256-62. ##
18. Lin HT, Hsu AT, Chang JH, Chien CS, Chang GL. Comparison of EMG Activity Between Maximal Manual Muscle Testing and Cybex Maximal Isometric Testing of the Quadriceps Femoris. J Formos Med Assoc. 2008;107(2):175-80.##
19. Peng HT, Kernozek TW, Song CY. Muscle activation of vastus medialis obliquus and vastus lateralis during a dynamic leg press exercise with and without isometric hip adduction . Phys Ther Sport. 2013 Feb;14(1):44-9.##
20. Laprade J, Culham E, Brouwer B. Comparasion of five isometric exercises in the recruitment of the vastus medialis obliqe in persons with and without patellofemoral pain syndrome. J Orthop Sports Phys Ther 1998;27(3):197-204. ##
21. Syke K, Wong Y . Electrical activity of vastus medialis oblique muscle in straight leg exercise with different angle of hip rotation. Physiotherapy. 2003;89(7):423-30.##
22. Kushion D, Rheaumez J, Kopchitz K, Jinn J.H. EMG Activation of the Vastus Medialis Oblique and Vastus Lateralis During Four Rehabilitative Exercises. J Open Rehabilitation January 2012;5:1-7.##