the effect of three types of military boots mileage on knee muscular co-contraction during running

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.comyou can also search for this author in:  pubmed, google scholar