Electromyographic activity in superficial muscles of the thigh and hip during the back squat to three different depths with relative loading

Issue: Vol. 5 No 3

Published by Journal of Fitness Research, 08/12/2016. Volume 5.3

Tags: Biceps Femoris , Gluteus Maximus , Squat Depth , Surface EMG , Vastus Lateralis , Vastus Medialis Oblique.

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  1. Benjamin Hammond
    Faculty of Arts & Sciences, Edge Hill University
  2. Pascual Marques-Bruna (Corresponding Author)
    Faculty of Arts & Sciences, Edge Hill University
  3. Eric Chauhan
    Faculty of Arts & Sciences, Edge Hill University
  4. Craig Bridge
    Faculty of Arts & Sciences, Edge Hill University

Abstract

Introduction: Inconclusive previous research on squat depth and the evoked electromyography (EMG)activity muddles our understanding of muscle recruitment in the back squat. This study determined EMGactivity as a function of squat depth in four superficial muscles of the lower limb using relative loading.

Method: Eight resistance trained males (mean ± SD age: 21 ± 1 years) performed back squats to partial,parallel and full depth using depth-relative 5-repetition–maximum loads. Muscle activity in the vastus medialis oblique (VMO), vastus lateralis (VL), gluteus maximus (GM), and biceps femoris (BF) during the concentric and eccentric phases of the squat was determined using surface electromyography. Peak (PeakEMG), mean (Mean EMG), and integrated (iEMG) EMG normalised to their respective maximum voluntary isometric contraction (MVIC) for each muscle were evaluated.

Results: Three-way Anovas and Sidak post-hoc analysis revealed significant effects for squat type (p =0.021 - 0.001), squat phase (p = 0.001), and muscle (p = 0.001). The significant differences were between the partial and the parallel squat (p = 0.016 - 0.001); for iEMG significant effects were also found between the partial and full squat (p = 0.001). The VMO elicited the highest EMG activity (e.g., Peak EMG 93.4 ± 36.9%MVIC; parallel squat, concentric) and the BF the lowest (e.g., Peak EMG 49.9 ± 14.7%). Greater GM activity occurred in parallel squats compared to full squats (mean difference in Peak EMG = 9.1% MVIC).

Conclusion: The findings suggest that squatting to the parallel position or lower induces optimal contractile stimulation of the quadriceps. Squatting to parallel depth maximises EMG activation of the GM, possibly due to a more advantageous external moment arm or a reduction in neural drive.

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Article Title

Electromyographic activity in superficial muscles of the thigh and hip during the back squat to three different depths with relative loading

Journal Title

Journal of Fitness Research Volume 5.3

Online Publication Date

08/12/2016

Author Names

Benjamin Hammond
Pascual Marques-Bruna (Corresponding Author)
Eric Chauhan
Craig Bridge
  1. Clark, D.R., Lambert, M.I., & Hunter, A.M. (2012). Muscle activation in the loaded free barbell squat: a brief review. Journal of Strength and Conditioning Research. 26: 1169-1178.
  2. Gullett, J.C., Tillman, M.D., Gutierrez, G.M., & Chow, J.W. (2009). A biomechanical comparison of back and front squats in healthy trained individuals. Journal of Strength and Conditioning Research. 23: 284-292.
  3. Escamilla, R.F., Fleisig, G.S., Lowry, T.M., Barrentine, S.W., & Andrews, J.R. (2001). A three-dimensional biomechanical analysis of the squat during varying stance widths. Medicine & Science in Sports & Exercise. 33: 984-1081.
  4. Escamilla, R.F., Rafael, F., Fleisig, G.S., Zheng, N., Lander, J.E., Barrentine, S.W., Andrews, J.R., Bergemann, B.W., & Moorman, C.T. (2001). Effects of technique variations on knee biomechanics during the squat and leg press. Medicine & Science in Sports & Exercise. 33: 1552-1566.
  5. Bryanton, M.A., Kennedy, M.D., Carey, J.P., & Chiu, L.Z.F. (2012). Effect of squat depth and barbell load on relative muscular effort in squatting. Journal of Strength and Conditioning Research. 26: 2820-2829.
  6. Luera, M.J., Stock, M.S., & Chappell, A.D.W. (2014). Electromyographic amplitude vs. concentric and eccentric squat force relationships for monoarticular and biarticular thigh muscles. Journal of Strength and Conditioning Research. 28: 328-338.
  7. Paoli, A., Marcolin, G., & Petrone, N. (2009). The effect of stance width on the electromyographical activity of eight superficial thigh muscles during back squat with different bar loads. Journal of Strength and Conditioning Research. 23: 246-250.
  8. Drinkwater, E.J., Moore, N.R., & Bird, S.P. (2012). Effects of changing from full range of motion to partial range of motion on squat kinetics. Journal of Strength and Conditioning Research. 26: 890-897.
  9. Escamilla, R.F. (2001). Knee biomechanics of the dynamic squat exercise. Medicine & Science in Sports & Exercise. 33: 127-141.

10.  Caterisano, A., Moss, R.F., Pellinger, T.K., Woodruff, K., Lewis, V.C., Booth, W., & Khadra, T. (2002). The effect of back squat depth on the EMG activity of 4 superficial hip and thigh muscles. Journal of Strength and Conditioning Research. 16: 428-432.

11.  Wretenberg, P., Feng, Y., Lindberg, F., & Arborelius, W. (1993). Joint moments of force and quadriceps muscle activity during squatting exercise. Scandinavian Journal of Medicine and Science in Sports. 3: 244–250.

12.  Flanagan, S.P., and Salem, G.J. (2008). Lower extremity joint kinetic responses to external resistance variations. Journal of Applied Biomechanics. 24: 58–68.

13.  Robertson, D.G.E., Wilson, J.M.J., & St. Pierre, T.A. (2008). Lower extremity muscle functions during full squats. Journal of Applied Biomechanics. 24: 333-340.

14.  Ebben, W.P. (2009). Hamstring activation during lower body resistance training exercises. International Journal of Sports Physiology and Performance. 4: 84-96.

15.  Gorsuch J., Long J., Miller K., Primeau K., Rutledge S., Sossong A., & Durocher J.J. (2010). The effect of squat depth on muscle activation in male and female cross-country runners. 28th International Conference on Biomechanics in Sports. July 19 – 23. Marquette, Michigan, USA.

16.  Baechle, T.R., & Earle, R.W. (2008). Essentials of Strength Training and Conditioning. Champaign, IL: Human Kinetics.

17.  Renshaw, D., Bice, M.R., Cassidy, C., Eldridge, J.A., & Powell, D.W. (2010). A Comparison of Three Computer-based Methods Used to Determine EMG Signal Amplitude. International Journal of Exercise Science. 3(1): 1–7.

18.  Soncin, R., Pennone, J., Guimaraes, T.M., Mezencio, B., Amadio, A.C., & Serrao, J.C. (2014). Influence of exercise order on electromyographic activity during upper body resistance training. Journal of Human Kinetics. 44: 202-208.

19.  Macrum, E., Bell, D.R., Boling, M., Lewek, M., & Padua, D. (2012). Effect of limiting ankle-dorsiflexion range of motion on lower extremity kinematics and muscle-activation patterns during a squat. Journal of Sport Rehabilitation 21: 144-193.

20.  Cohen, J. (1988). Statistical power analysis for the behavioral sciences. London, UK: Routledge Academic.

21.  Distefano, L.J., Blackburn, J.T., Marshall, S.W., & Padua, D.A. (2009). Gluteal muscle activation during common therapeutic exercises. The Journal of Orthopaedic and Sports Physical Therapy. 39: 532-540.

22.  Schoenfeld, B.J. (2010). Squatting kinematics and kinetics and their application to exercise performance. Journal of Strength and Conditioning Research. 24: 3497-3506.

23.  Burden, A. (2010). How should we normalize electromyograms obtained from healthy participants? What we have learned from over 25 years of research. Journal of Electromyography and Kinesiology. 20: 1023-1057.

24.  Halaki, M., & Ginn, K. (2012). Normalization of EMG signals: To normalize and what to normalize to? In: Computational Intelligence in Electromyography Analysis – A Perspective on Current Applications and Future Challenges. Naik, GR, ed. Rijeka, Croatia: InTech, 175-194.

25.  Albertus-Kajee, Y., Tucker, R., Derman, W., Lamberts, R.P., & Lambert, M.I. (2011). Alternative methods of normalising EMG during running. Journal of Electromyography and Kinesiology. 21: 579-664.

26.  Sousa, C.O., Ferreira, J.J.A., Veras-Medeiros, A.C., Carvalho, A.H., Pereira, R.C., Guedes, D.T., et al. (2007). Electromyographic activity in squatting at 40˚, 60˚ and 90˚ knee flexion positions. Revista Brasileira de Medicina do Esporte. 13: 280-285.

27.  Harman, E., & Garhammer, J. (2008). Administration, scoring and interpretation of selected tests. In: Essentials of Strength Training and Conditioning. Baechle, TR, and Earle, RW, eds. Leeds, UK: Human Kinetics. pp. 249-292.

28.  Duffey, M.J., & Challis, J.H. (2007). Fatigue effects on bar kinematics during the bench press. Journal of Strength and Conditioning Research. 21: 556-560.

29.  Mccaw, S.T., & Melrose, D.R. (1999). Stance width and bar load effects on leg muscle activity during the parallel squat. Medicine & Science in Sports & Exercise. 31: 428-436.

30.  O’Donoghue P. (2012). Statistics for sport and exercise studies: an introduction. London: Routledge.

31.  Wretenberg, P.E.R., Feng, Y.I., & Arborelius, U.P. (1996). High- and low-bar squatting techniques during weight-training. Medicine & Science in Sports & Exercise. 28: 218-224.

32.  Hartmann, H., Wirth, K., & Klusemann, M. (2013). Analysis of the load on the knee joint and vertebral column with changes in squatting depth and weight load. Sports Medicine. 43: 993-1008.

33.  Vasconcelos, R.A., Arakaki, J.C., Simao, A.P., Oliveira, A.S., Paccola, C.A.J., & Bevilaqua-Grossi, D. (2007). Analysis of anterior tibial translation, peak torque, and quadriceps and hamstrings coactivation in individuals with anterior cruciate ligament injuries performing isometric open kinetic chain exercises. Acta Ortopedica Brasileira. 15: 14-16.

34.  Hirst, H.E., Armeau, E., & Parish, T. (2007). Recognizing anterior cruciate ligament tears in female athletes: what every primary care practitioner should know. The Internet Journal of Allied Health Sciences and Practice. 5: 125-132.

35.  Blackburn, J.T., Norcross, M.F., Cannon, L.N., & Zinder, S.M. (2013). Hamstrings stiffness and landing biomechanics linked to anterior cruciate ligament loading. Journal of Athletic Training. 48: 764-835.

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