Volume 11, Issue 3 (Spring 2025)
IJRN 2025, 11(3): 0-0 |
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Jalilian S A, bagheri S, Hajiloo B. Comparison of Muscle Co-Contraction during Functional Training Techniques at Hard and Soft Surfaces in Athletes with Anterior Cruciate Ligament Injury. IJRN 2025; 11 (3) : 2
URL: http://ijrn.ir/article-1-772-en.html
URL: http://ijrn.ir/article-1-772-en.html
Assistant professor, Department of Sport Sciences, Faculty of Literature & Humanities, Lorestan University, Khorramabad, Iran. bagherishahab@yahoo.com
Abstract: (138 Views)
Introduction: The difference in material surfaces may affect sports performance and muscle activity, and factors such as softness, rebound, cushioning, and force absorption are effective on motor tasks. The purpose of this study is to compare the co-contraction of effective muscles in anterior cruciate ligament injury during two functional exercises on surfaces that were hard and soft.
Methods: 29 male university athletes with an average height of 171.3±3.54 cm, weight of 75.4±2.5 kg, and age of 24.47±2.26 years were selected to participate in the study. Functional exercises, including squat jump and squat jump, and two softs (Tatami) and hard (Ground) surfaces, were considered for training. The electromyographic activity of the rectus femoris, Vastus Medialis, Vastus lateralis, semitendinosus, and semimembranous muscles during the exercises was recorded in two stages, once on a soft surface and once on a hard surface. The Shapier-Wilk test was used to determine the normality of the data distribution, and the two-way analysis of variance with repeated measurements test was used to compare the electromyographic activity in two hard and soft surfaces at a significance level of α = 0.05.
Results: The results showed that the main effect of surface on internal-external co-contraction (p=0.000) and directional flexor-extensor co-contraction (p=0.000) and general co-contraction was not significant (p=0.955). The main effect of training on internal-external co-contraction (p=0.008), flexor-extensor co-contraction (p=0.013), and general co-contraction (p=0.031) was significant. The interaction effect was significant only in general co-contraction (p=0.025).
Conclusion: The results showed that the hard surface and squat jump were more effective in training programs to prevent anterior cruciate ligament injury than the squat jump and soft surface. According to the present study's findings, compound jumping exercise leads to more flexion contraction and can be a risk factor for anterior cruciate ligament damage.
Methods: 29 male university athletes with an average height of 171.3±3.54 cm, weight of 75.4±2.5 kg, and age of 24.47±2.26 years were selected to participate in the study. Functional exercises, including squat jump and squat jump, and two softs (Tatami) and hard (Ground) surfaces, were considered for training. The electromyographic activity of the rectus femoris, Vastus Medialis, Vastus lateralis, semitendinosus, and semimembranous muscles during the exercises was recorded in two stages, once on a soft surface and once on a hard surface. The Shapier-Wilk test was used to determine the normality of the data distribution, and the two-way analysis of variance with repeated measurements test was used to compare the electromyographic activity in two hard and soft surfaces at a significance level of α = 0.05.
Results: The results showed that the main effect of surface on internal-external co-contraction (p=0.000) and directional flexor-extensor co-contraction (p=0.000) and general co-contraction was not significant (p=0.955). The main effect of training on internal-external co-contraction (p=0.008), flexor-extensor co-contraction (p=0.013), and general co-contraction (p=0.031) was significant. The interaction effect was significant only in general co-contraction (p=0.025).
Conclusion: The results showed that the hard surface and squat jump were more effective in training programs to prevent anterior cruciate ligament injury than the squat jump and soft surface. According to the present study's findings, compound jumping exercise leads to more flexion contraction and can be a risk factor for anterior cruciate ligament damage.
Article number: 2
Type of Study: Research |
Received: 2022/12/12 | Accepted: 2024/10/22 | Published: 2025/05/4
Received: 2022/12/12 | Accepted: 2024/10/22 | Published: 2025/05/4
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