Studies in Sport Medicine

Comparison of co-contraction and peak contraction of selected lower limb muscles during landing on different surfaces in Block defense skills

Document Type : Research Paper

Authors

saba abrifam 1
Ali Fatahi 2
hasan Matin Homaei 3

1 PhD student from Islamic Azad University, Central Tehran Branch

2 Assistant Professor, Sports Biomechanics Department, Physical Education and Sports Sciences Faculty, Islamic Azad University of Central Tehran Branch, Tehran, Iran

3 Department of sport Physiology

https://doi.org/10.22089/smj.2022.12460.1590
Abstract
Surface stiffness is a factor affecting the injuries since any change in in the amount of this parameter leads to the increased applied forces. This is a quasi-experimental, causal-comparative, and applied study. The statistical population included 14 volleyball players aged between 18 and 20. The muscles’ electrical activity was recorded by an 8-channel electromyograph based on the SENIAM protocol (Surface ElectroMyoGraphy for the Non-Invasive Assessment of Muscles) on four selected muscles of the lower limb. Mean and standard deviation (SD) were employed for data description, Shapiro-Wilk test for the assessment of data distribution normality, analysis of variance with repeated measures for the effect of surface type on the research variables, and Bonferroni post hoc test was used for the assessment of differences. Furthermore, the repeated measurement test’s results revealed no significant difference between groups in terms of the peak muscle activities in Vastus lateralis muscle and Biceps femoris muscle when jumping and landing on tatami, grass, and sand (p≤0.05); however, the surfaces were significantly different in the tibialis anterior muscle and gastrocnemius muscle (p = 0.00). Besides, there was no significant difference between co-contractions in knee and ankle joint (p≤0.05); the difference was that in the knee joint, the highest average co-contraction was seen on the grass and its lowest rate on the sand, while in the ankle joint, the lowest rate was seen on the sand and the highest rate on tatami.

Keywords

Surfaces
EMG Co-contraction
Lower Limb

Subjects

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Studies in Sport Medicine
Volume 14, Issue 33
December 2022
Pages 81-96

  • Receive Date 17 April 2022
  • Revise Date 04 July 2022
  • Accept Date 12 July 2022

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