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The Effect of Altering Knee Position and Squat Depth on VMO : VL EMG Ratio During Squat Exercises.

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  • معلومة اضافية
    • Subject Terms:
    • Author-Supplied Keywords:
      patellofemoral joint
      squat exercises
      vastus lateralis
      vastus medialis obliquus
    • Abstract:
      Background Patellofemoral pain syndrome is an extremely common condition, believed to be caused by altered activation of vastus medialis obliquus (VMO), leading to maltracking of the patella. Aim This study aimed to investigate the effect of altering knee movement and squat depth on the ratio of VMO and vastus lateralis (VMO : VL) during squat exercises. Method Eighteen (7 male and 11 female) healthy, asymptomatic participants performed semi-squat exercises with three squat depths (20°, 50° and 80° of knee flexion) while following three knee movement paths (neutral, varus or valgus). Normalized VMO : VL ratio from linear envelope surface electromyography was analysed. Results No significant effect was found for gender ( p = 0.87), leg dominance ( p = 0.99) or knee position ( p = 0.44). A significant effect was found for squat depth ( p < 0.001) with both the 50° and 80° squats showing increases in VMO : VL ratio ( p = 0.031 and p = 0.028), respectively. The VMO : VL ratio was not influenced by gender, leg dominance or knee position in semi-squat exercises. Discussion and Conclusion Increases in relative VMO activation did occur in 'deeper' squat depths (50° and 80° knee flexion) compared with the 20° condition. Further research is needed in this area concerning the effects of such exercise modifications on a symptomatic patellofemoral pain syndrome population. Copyright © 2015 John Wiley & Sons, Ltd. [ABSTRACT FROM AUTHOR]
    • Abstract:
      Copyright of Physiotherapy Research International is the property of John Wiley & Sons, Inc. and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
    • Author Affiliations:
      1Department of Physiotherapy, Faculty of Medicine, Nursing and Health Sciences, Monash University, Melbourne Australia
      2Physica Devonport Physiotherapy, Devonport Australia
      3Department of Medicine (Royal Melbourne Hospital), The University of Melbourne, Melbourne Australia
    • ISSN:
      1358-2267
    • Accession Number:
      10.1002/pri.1631
    • Accession Number:
      117874514
  • Citations
    • ABNT:
      JABERZADEH, S.; YEO, D.; ZOGHI, M. The Effect of Altering Knee Position and Squat Depth on VMO : VL EMG Ratio During Squat Exercises. Physiotherapy Research International, [s. l.], v. 21, n. 3, p. 164–173, 2016. DOI 10.1002/pri.1631. Disponível em: http://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=asn&AN=117874514&custid=s8280428. Acesso em: 1 abr. 2020.
    • AMA:
      Jaberzadeh S, Yeo D, Zoghi M. The Effect of Altering Knee Position and Squat Depth on VMO : VL EMG Ratio During Squat Exercises. Physiotherapy Research International. 2016;21(3):164-173. doi:10.1002/pri.1631.
    • APA:
      Jaberzadeh, S., Yeo, D., & Zoghi, M. (2016). The Effect of Altering Knee Position and Squat Depth on VMO : VL EMG Ratio During Squat Exercises. Physiotherapy Research International, 21(3), 164–173. https://doi.org/10.1002/pri.1631
    • Chicago/Turabian: Author-Date:
      Jaberzadeh, Shapour, Daniel Yeo, and Maryam Zoghi. 2016. “The Effect of Altering Knee Position and Squat Depth on VMO : VL EMG Ratio During Squat Exercises.” Physiotherapy Research International 21 (3): 164–73. doi:10.1002/pri.1631.
    • Harvard:
      Jaberzadeh, S., Yeo, D. and Zoghi, M. (2016) ‘The Effect of Altering Knee Position and Squat Depth on VMO : VL EMG Ratio During Squat Exercises’, Physiotherapy Research International, 21(3), pp. 164–173. doi: 10.1002/pri.1631.
    • Harvard: Australian:
      Jaberzadeh, S, Yeo, D & Zoghi, M 2016, ‘The Effect of Altering Knee Position and Squat Depth on VMO : VL EMG Ratio During Squat Exercises’, Physiotherapy Research International, vol. 21, no. 3, pp. 164–173, viewed 1 April 2020, .
    • MLA:
      Jaberzadeh, Shapour, et al. “The Effect of Altering Knee Position and Squat Depth on VMO : VL EMG Ratio During Squat Exercises.” Physiotherapy Research International, vol. 21, no. 3, Sept. 2016, pp. 164–173. EBSCOhost, doi:10.1002/pri.1631.
    • Chicago/Turabian: Humanities:
      Jaberzadeh, Shapour, Daniel Yeo, and Maryam Zoghi. “The Effect of Altering Knee Position and Squat Depth on VMO : VL EMG Ratio During Squat Exercises.” Physiotherapy Research International 21, no. 3 (September 2016): 164–73. doi:10.1002/pri.1631.
    • Vancouver/ICMJE:
      Jaberzadeh S, Yeo D, Zoghi M. The Effect of Altering Knee Position and Squat Depth on VMO : VL EMG Ratio During Squat Exercises. Physiotherapy Research International [Internet]. 2016 Sep [cited 2020 Apr 1];21(3):164–73. Available from: http://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=asn&AN=117874514&custid=s8280428