Walaa M. Elsais1, Walaa S. Mohammad2,3
1University of Salford, Centre for Health Sciences Research, Manchester, United Kingdom
2Majmaah University, College of Applied Medical Sciences, Department of Physical Therapy, Majmaah, Saudi Arabia
3Cairo University, Faculty of Physical Therapy, Department of Biomechanics, Giza, Egypt
Comparison of Electromyographic Amplitudes of the Adductor Magnus Muscle among Three Different Clinical Testing Positions
Monten. J. Sports Sci. Med. 2020, 9(2), 21-26 | DOI: 10.26773/mjssm.200904
Although normalizing the EMG signals is necessary for physiological interpretation and comparison between muscles and between subjects, no EMG study has investigated the standardized position to achieve maximal contraction for the adductor magnus muscle. Accordingly, it is necessary to employ a maximum voluntary isometric contraction (MVIC) position that elicits the highest activation to increase the validity of EMG studies and provide accurate comparisons between studies. Therefore, the purpose of this study was to compare the peak electromyography (EMG) of the most commonly used positions in the literature (i.e., the fully extended hip and knee, hip-flexed 45°, and knee at 90°) to a novel position: prone hip extension with 90° knee flexion. An ultrasound imaging system was used to guide the surface EMG electrode placement on the adductor magnus (AM) muscle, for a group of ninety-four recreational runners. AM demonstrated the greatest MVIC activity in both prone and hip-flexed 45° positions with no significant differences between them (p < 0.05). However, significant differences were displayed between the AM activities while performing the fully extended hip position and the other two positions. Based on these results, it is recommended that the prone and hip-flexed 45° positions can be used to measure the MVIC of the AM interchangeably. Furthermore, the prone position can be considered to be a position of the greatest MVIC of AM, particularly when the position of hip-flexed 45° is limited as well as it can be used to quantify MVIC for both AM and hip extensor muscles simultaneously.
MVIC, Adductor magnus, EMG, positions
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Benn, M. L., Pizzari, T., Rath, L., Tucker, K., & Semciw, A. I. (2018). Adductor magnus: An EMG investigation into proximal and distal portions and direction specific action. Clinical Anatomy, 31(4), 535-543.
Burden, A., Trew, M., & Baltzopoulos, V. (2003). Normalisation of gait EMGs: a re-examination. Journal of Electromyography and Kinesiology, 13(6), 519-532.
Clancy, E. A., Morin, E. L., & Merletti, R. (2002). Sampling, noise-reduction and amplitude estimation issues in surface electromyography. Journal of Electromyography and Kinesiology, 12(1), 1-16. https://doi.org/10.1016/S1050-6411(01)00033-5
Contreras, B., Vigotsky, A. D., Schoenfeld, B. J., Beardsley, C., & Cronin, J. (2015). A comparison of two gluteus maximus EMG maximum voluntary isometric contraction positions. PeerJ, 3, e1261.
De Luca, C. J. (1997). The use of surface electromyography in biomechanics. Journal of applied biomechanics, 13(2), 135-163.
Ha, S.-m., Cynn, H.-s., Kwon, O.-y., Park, K.-n., & Kim, G.-m. (2013). A reliability of electromyographic normalization methods for the infraspinatus muscle in healthy subjects. Journal of human kinetics, 36(1), 69-76.
Hermens, H. J., Freriks, B., Disselhorst-Klug, C., & Rau, G. (2000). Development of recommendations for SEMG sensors and sensor placement procedures. Journal of Electromyography and Kinesiology, 10(5), 361-374. https://doi.org/10.1016/s1050-6411(00)00027-4
Hermens, H. J., Freriks, B., Merletti, R., Stegeman, D., Blok, J., Rau, G., . . . Hägg, G. (1999). European recommendations for surface electromyography. Roessingh research and development, 8(2), 13-54.
Hubley-Kozey, C. L., Deluzio, K. J., Landry, S. C., McNutt, J. S., & Stanish, W. D. (2006). Neuromuscular alterations during walking in persons with moderate knee osteoarthritis. Journal of Electromyography and Kinesiology, 16(4), 365-378. https://doi.org/10.1016/j.jelekin.2005.07.014
Hubley-Kozey, C. L., Hatfield, G. L., Wilson, J. L. A., & Dunbar, M. J. (2010). Alterations in neuromuscular patterns between pre and one-year post-total knee arthroplasty. Clinical Biomechanics, 25(10), 995-1002. https://doi.org/10.1016/j.clinbiomech.2010.07.008
Ito, J. (1996). Morphological analysis of the human lower extremity based on the relative muscle weight. Okajimas folia anatomica Japonica, 73(5), 247.
Ito, J., Moriyama, H., Inokuchi, S., & Goto, N. (2003). Human lower limb muscles: an evaluation of weight and fiber size. Okajimas Folia Anatomica Japonica, 80(2-3), 47-55.
Ko, H.-i., Jeon, S.-y., Kim, S.-h., & Park, K.-n. (2019). Comparison of hip extensor muscle activity including the adductor magnus during three prone hip extension exercises. Physiotherapy theory and practice, 35(5), 451-457.
Lehman, G. J., & McGill, S. M. (1999). The importance of normalization in the interpretation of surface electromyography: A proof of principle. Journal of Manipulative and Physiological Therapeutics, 22(7), 444-446. https://doi.org/10.1016/S0161-4754(99)70032-1
Lovell, G. A., Blanch, P. D., & Barnes, C. J. (2012). EMG of the hip adductor muscles in six clinical examination tests. Physical Therapy in Sport, 13(3), 134-140. https://doi.org/10.1016/j.ptsp.2011.08.004
Németh, G., & Ohlsén, H. (1985). In vivo moment arm lengths for hip extensor muscles at different angles of hip flexion. Journal of Biomechanics, 18(2), 129-140.
Neumann, D. (2010). Kinesiology of the musculoskeletal system: foundations for rehabilitation. St. Louis, MO: Mosby Elsevier.
Shiavi, R., Frigo, C., & Pedotti, A. (1998). Electromyographic signals during gait: criteria for envelope filtering and number of strides. Medical and Biological Engineering and Computing, 36(2), 171. https://doi.org/10.1007/BF02510739
Takizawa, M., Suzuki, D., Ito, H., Fujimiya, M., & Uchiyama, E. (2014). Why adductor magnus muscle is large: The function based on muscle morphology in cadavers. Scandinavian Journal of Medicine & Science in Sports, 24(1), 197-203. https://doi.org/10.1111/j.1600-0838.2012.01466.x
Watanabe, K., Katayama, K., Ishida, K., & Akima, H. (2009). Electromyographic analysis of hip adductor muscles during incremental fatiguing pedaling exercise. European Journal of Applied Physiology, 106(6), 815-825. https://doi.org/10.1007/s00421-009-1086-6
Williams, S. B., Wilson, A. M., Daynes, J., Peckham, K., & Payne, R. C. (2008). Functional anatomy and muscle moment arms of the thoracic limb of an elite sprinting athlete: the racing greyhound (Canis familiaris). Journal of Anatomy, 213(4), 373-382. https://doi.org/10.1111/j.1469-7580.2008.00962.x
Winter, D. A., & Yack, H. J. (1987). EMG profiles during normal human walking: stride-to-stride and inter-subject variability. Electroencephalography and Clinical Neurophysiology, 67(5), 402-411.
Yamauchi, J., Kurihara, T., Yoshikawa, M., Taguchi, S., & Hashimoto, T. (2015). Specific characterization of regional storage fat in upper and lower limbs of young healthy adults. Springerplus, 4(1), 402.