Sport Sciences Research Institute Studies in Sport Medicine 2322-1658 13 29 2021 08 23 Comparison and investigation of relationship between lower extremity strength and active range of motion of the ankle with static and dynamic balance in deaf athletes and non-athletes Comparison and investigation of relationship between lower extremity strength and active range of motion of the ankle with static and dynamic balance in deaf athletes and non-athletes 59 76 2588 10.22089/smj.2021.10846.1514 FA Mohammadreza Seyedi Assistant professor in Sport Sciences Research Institute of IRAN; PhD of Sport Injuries &amp; Corrective Exercises 0000-0002-5551-4610 Foad Seidi Associate Professor, Corrective Exercise Specialist, Health and Sports Medicine Department Hooman Minoonejad Associate professor of sport injuries and corrective exercises, Health and Sport Medicine Department Karim Biglar MSc of Sport Injuries &amp; Corrective Exercises, University of Tehran Journal Article 2021 06 28 The aim of this study was to investigate the relationship between lower extremity strength and active range of motion of the ankle with static and dynamic balance in deaf athletes and non-athletes and compare them. 30 adolescent boys with congenital sever deafness were recruited according to the study inclusion and exclusion criteria and allocated into athlete and non-athlete groups. A Biodex Stability System, dynamometer and goniameter used. The results revealed that the athlete deaf subjects showed significantly better static and dynamic balance when compared to non-athletes deaf and significant difference between lower extremity strength (ankle plantar flexor and hip extensor muscles strength) of athlete and non-athlete deaf. There was a significant relationship between lower extremity strength and ankle active ROM with static and dynamic balance. <br />It seems that higher strength of hip extensor and plantar flexor muscles in deaf athletes resulted in better static and dynamic balance. The aim of this study was to investigate the relationship between lower extremity strength and active range of motion of the ankle with static and dynamic balance in deaf athletes and non-athletes and compare them. 30 adolescent boys with congenital sever deafness were recruited according to the study inclusion and exclusion criteria and allocated into athlete and non-athlete groups. A Biodex Stability System, dynamometer and goniameter used. The results revealed that the athlete deaf subjects showed significantly better static and dynamic balance when compared to non-athletes deaf and significant difference between lower extremity strength (ankle plantar flexor and hip extensor muscles strength) of athlete and non-athlete deaf. There was a significant relationship between lower extremity strength and ankle active ROM with static and dynamic balance. <br />It seems that higher strength of hip extensor and plantar flexor muscles in deaf athletes resulted in better static and dynamic balance. https://smj.ssrc.ac.ir/article_2588_fb89fd138b104dcf8e2077ad2a23954d.pdf