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Chronic ankle instability (ICT) is common in jumping sports, may alter muscle recruitment, result in functional limitations and recurrence of sprains in this joint. The purpose of the study was to compare the muscle recruitment of the anterior tibial and long fibular muscles of athletes with and without chronic ankle instability by means of surface electromyography. Thirty-four athletes were recruited, divided into instability group (GI: n=14) and control group (GC: n=20), of both sexes and from different sport modalities, aged between 18 and 27 years old, history of ankle sprain in the last 12 months and functional limitation established by the Cumberland Ankle Instability (CAIT) questionnaire, the recruitment of the anterior tibial and long fibular muscles was analyzed by surface electromyography during the lunge exercise. The results for GI and GC were, respectively: age 21.3±2.88 and 22.4±3.25, height 1.77±0.10 and 1.74±0.08, CAIT 17[12.2-19] and 29.5 [27-30] (p<0.001). The anterior tibial and long fibular muscle recruitment in GI was 111.1[62.5-165.4] and 68.2±29, respectively and in GC 106.8[79.8-230.5] and 54.4±26.4, without significant difference. ICT did not interfere in the recruitment of the anterior tibial and long fibular muscles during the lunge exercise in athletes. Keywords: Ankle. Sprains and Strains. Health Evaluation. ResumoA instabilidade cronica do tornozelo (ICT) e comum em esportes de saltos, pode alterar o recrutamento muscular, resultar em limitacoes funcionais e recidivas de entorses nesta articulacao. O objeto do estudo foi comparar o recrutamento muscular dos musculos tibial anterior e fibular longo de atletas com e sem instabilidade cronica de tornozelo por meio da eletromiografia de superficie. Foram recrutados 34 atletas, divididos em grupo instabilidade (GI: n=14) e grupo controle (GC: n=20), de ambos os sexos e de diferentes modalidades esportivas, com idade entre 18 e 27 anos, historia de entorse de tornozelo nos ultimos 12 meses e limitacao funcional estabelecida pelo questionario Cumberland Ankle Instability (CAIT), o recrutamento dos musculos tibial anterior e fibular longo foi analisado pela eletromiografia de superficie durante o exercicio de agachamento afundo. Os resultados para GI e GC foram, respectivamente: idade 21,3±2,88 e 22,4±3,25, altura 1,77±0,10 e 1,74±0,08, CAIT 17[12,2–19] e 29,5 [27-30] (p<0,001). O recrutamento muscular do tibial anterior e fibular longo no GI foi 111,1[62,5-165,4] e 68,2±29, respectivamente e no GC 106,8[79,8-230,5] e 54,4±26,4, sem diferenca significativa. A ICT nao interferiu no recrutamento dos musculos tibial anterior e fibular longo durante a realizacao do exercicio de agachamento afundo em atletas. Palavras-chave: Tornozelo. Entorses e Distensoes. Avaliacao em Saude

Comparison of Electromyographic Activity of Anterior Tibial Muscles and Long Fibular in Athletes With and Without Chronic Ankle Instability