The Effect of Three Types of Military Boots Mileage on Knee Muscular Co-contraction During Running

Hamlabadi, Milad Piran; Jafarnezhadgero, AmirAli; Bakhshodeh Nia, Iman; Hassannejad, Hamid

doi:10.32598/ptj.13.3.348.7

Volume 13, Issue 3 (Summer 2023) PTJ 2023, 13(3): 159-164 | Back to browse issues page

‎ 10.32598/ptj.13.3.348.7

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Hamlabadi M P, Jafarnezhadgero A, Bakhshodeh Nia I, Hassannejad H. The Effect of Three Types of Military Boots Mileage on Knee Muscular Co-contraction During Running. PTJ 2023; 13 (3) :159-164
URL: http://ptj.uswr.ac.ir/article-1-577-en.html

The Effect of Three Types of Military Boots Mileage on Knee Muscular Co-contraction During Running

Milad Piran Hamlabadi¹

, AmirAli Jafarnezhadgero ^*

², Iman Bakhshodeh Nia¹

, Hamid Hassannejad³

1- Department of Sports Management, Faculty of Educational Sciences and Psychology, University of Mohaghegh Ardabili, Ardabil, Iran.
2- Department of Sport Biomechanics, Faculty of Educational Sciences and Psychology, University of Mohaghegh Ardabili, Ardabil, Iran.
3- Department of Industrial Engineering, Faculty of Engineering, Science and Technology University, Tehran, Iran.

Abstract: (1480 Views)

Purpose: Military boots mileage is a main factor that can affect the risk of running injuries. The present study aims to evaluate the effect of three types of military boots mileage on knee muscular co-contraction during running.
Methods: Fifteen healthy males received three pairs of new military boots. Participants wore these boots for more than 6 months. Electromyography activity of lower limb muscles during running at constant speed was recorded during pre- and post-intervention. Then, knee muscular co-contraction was calculated.
Results: Results showed a significant increase during loading response (P=0.030, n2p=0.157) and push-off (P=0.008, n2p=0.302) phases for general knee co-contraction at post-test compared to the pre-test. Also, directed mediolateral knee co-contraction showed a significant increment during mid-stance (P=0.028, n2p=0.040) and push-off (P=0.039, n2p=0.115) phases at post-test compared to the pre-test.
Conclusion: It can be concluded that knee joint instability while using polyurethane thermoplastic is more than polyurethane boots. Also, our results demonstrated that maintaining knee stability in the anterior-posterior direction while using polyurethane thermoplastic is better than in polyurethane boots.

Coresponding author: AmirAli Jafarnezhadgero, E-mail: amiralijafarnezhad@gmail.com
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Keywords: Co-contraction, Military boots, Rubber, Polyurethane, Polyurethane thermoplastic, Knee joint

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Research utilized biomechanical methodologies through muscle co-contractions to understand the difference between used and new military boots.
• The results showed the type of military boots affects the general and directional co-contraction of the knee joint during running.
• Increased general knee co-contraction may be associated with instability of the joint after fatigue.

Plain Language Summary
During daily activities, soldiers are required to engage in strenuous physical activity. Essentially, this will include walking and running carrying various items of equipment often through rough terrain. Level of fitness increases using running activities. On the other hand, co-contraction increment energy expenditure, leading to a high cost of walking and fatigue. Therefore, this study was conducted to examine the effect of three types of military boots mileage on knee muscular co-contraction during running. Fifteen healthy males received three new and used military boots. They were asked to wear these boots for over 6 months. Participants were recruited in May 2022 from Mohaghegh Ardabili University, Ardabil City, Iran. We used the freeware tool GPower to calculate a one-sided a priori power analysis. A wireless EMG system with eight pairs of bipolar Ag/AgCl surface electrodes was used to record the activity of the tibialis anterior (TA), gastrocnemius medialis (Gas-Med), biceps femoris (BF), semitendinosus (ST), vastus lateralis (VL), vastus medialis (VM), and rectus femoris (RF), and gluteus medius (Glut-Med) muscles of the right leg. Pre and postintervention, EMG testing was conducted and co-contraction of the right leg was recorded during running at 3.6 run speed. Based on the results of this study, and following the use of military boots, the knee general co-contraction was increased. The results demonstrated more directed mediolateral knee co-contraction and greater directed flexion and extension co-contraction in used boots situations. Individuals express a clear need to use military boots using for their soldiers to help cope with challenges associated with the use of military boots and their injuries. Changing boots after 6 months of heavy wearing seems to be suitable for military people.

Type of Study: Research | Subject: General
Received: 2023/05/23 | Accepted: 2023/06/10 | Published: 2023/07/1

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