Immediate Effect of Foot Insole on Electromyography Activity Ratio of VMO and VL Muscles During One-Leg Drop Jump

Document Type : Original article

Authors

1 Associate Professor, Faculty of Sport Sciences, Bu-Ali Sina University, Hamedan, Iran.

2 PhD student in Sports Biomechanics, Faculty of Sport Sciences, Bu-Ali Sina University, Hamedan, Iran.

3 MSc. in Sports Biomechanics, Faculty of Sport Sciences, Bu-Ali Sina University, Hamedan, Iran.

Abstract

Background and Aim: Although the biomechanical effects of insole on optimization of movement patterns, especially in the lower limbs in rehabilitation sciences, have been documented, the effect of applying it in modifying sports basic movement patterns is not well-known. The aim of present study was to investigate the effect of three foot insoles (rigid, semi-rigid, and soft) on electromyography activity ratio of VMO and VL muscles.
Materials and Methods: A total of 13 male participants took part in the present semi-experimental study. Electromyography activities of Vastus Medialis Obliqe (VMO) and Vastus Lateralis (VL) muscles were recorded and VMO/VL ratio was compared in four conditions: wearing only shoes, soft-sole, semi-sole, and rigid-sole during one-leg drop jump. ANOVA with Repeated measures test was used for data analyses (p<0.05).
Results: The VMO muscle activation in soft-sole condition significantly increased in comparison with semi-rigid condition in the eccentric phase (P<0.05). There was a significant increase in electromyography activation for Vastus lateralis muscle in soft-sole condition compared to non-sole and rigid-sole in the eccentric phase (P<0.05). Also, there was no significant difference observed for VMO and VL activation in conditions during concentric and pre-activation phases. Finally, VMO/VL activation ratio in rigid-sole significantly increased in comparison with semi-sole in the eccentric phase.
Conclusion: Considering the influence of rigid insole on increasing the VMO/VL ratio during the execution of drop jump task, it seems that using rigid insole may be useful in improving and expediting individuals' rehabilitation with imbalance problems between VMO and VL muscles during jumping tasks.

Keywords

Main Subjects

References

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The Scientific Journal of Rehabilitation Medicine
Volume 6, Issue 3
September and October 2017
Pages 68-76

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History

  • Receive Date: 09 June 2016
  • Revise Date: 04 August 2016
  • Accept Date: 24 September 2016
  • First Publish Date: 23 September 2017

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