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 crônica do tornozelo (ICT) é comum em esportes de saltos, pode alterar o recrutamento muscular, resultar em limitações funcionais e recidivas de entorses nesta articulação. O objeto do estudo foi comparar o recrutamento muscular dos músculos tibial anterior e fibular longo de atletas com e sem instabilidade crônica de tornozelo por meio da eletromiografia de superfície. 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, história de entorse de tornozelo nos últimos 12 meses e limitação funcional estabelecida pelo questionário Cumberland Ankle Instability (CAIT), o recrutamento dos músculos tibial anterior e fibular longo foi analisado pela eletromiografia de superfície durante o exercício 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 diferença significativa. A ICT não interferiu no recrutamento dos músculos tibial anterior e fibular longo durante a realização do exercício de agachamento afundo em atletas. Palavras-chave: Tornozelo. Entorses e Distensões. Avaliação em Saúde
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