Examination of Muscular Electromyography during Deadlift at Pyramid and Reverse Pyramid Loadings

Document Type : Original article

Authors

1 Faculty of Physical Education and Sports Sciences, Karaj Branch, Islamic Azad University, Karaj, Iran

2 PhD, Assistant Professor in Sports Biomechanics, Faculty of Physical Education and Sports Sciences, Kharazmi University, Tehran, Iran

Abstract

Background and Aim: Athletes usePyarmid and Reverse Pyramid loadings in resistance training to increase training load. Although researches have shown that each loading is effective in increasing strength and muscle mass, from the viewpoint of risk of injury and biomechanics, the differences between these two patterns on athletic performance have not been fully understood. The purpose of the current study was to examine muscular electromyography during deadlift in pyramid and reverse pyramid loadings.
Materials and Methods: A total of 15 amateur female bodybuilders voluntarily participated in the current study taking part in five Repeated Maximum (5RM) calculation test as well as deadlift test with pyramid and reverse pyramid loading at 60%, 80%, and 100% of 5 RM during three days with 48 hours rest. Rectus Femoris, Vastus Medialis, Biceps Femoris, Tibialis Anterior, Gastrocnemius, Gluteus Maximus, and Erector Spine EMG were collected using MyoMuscle Noraxon system at 1500 Hz frequency during deadlift tasks. The muscular IEMG and hamstring to quadriceps co-contraction during five squat repeats were calculated and compared in similar loads during pyramid and reverse pyramid loadings.
Results: The results of dependent t-test showed that lower extremity muscular EMG did not have significant differences in similar loads at pyramid and reverse pyramid loadings (P > 0.05); however, hamstring to quadriceps co-contraction was significantly higher in pyramid compared with reverse pyramid in similar loadings (P ≤ 0.05).
Conclusion: According to the results, both pyramid and reverse pyramid loadings in deadlift can cause similar muscular activation in females, and female athletes and coaches can use both these methods to increase muscular force capacity. However, because of higher hamstring to quadriceps co-contraction in pyramid, compared with reverse pyramid loading, it seems that using pyramid loading is more reasonable to increasing joint stability and reducing injuries.

Keywords

Main Subjects

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The Scientific Journal of Rehabilitation Medicine
Volume 9, Issue 2
July 2020
Pages 17-24

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History

  • Receive Date: 09 July 2019
  • Revise Date: 03 August 2019
  • Accept Date: 14 August 2019
  • First Publish Date: 21 June 2020

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