Evaluation of mechanical and electromyographic factors associated with ankle sprain in female athletes / Avaliação dinamométrica e eletromiográfica do efeito das bandagens funcionais na articulação do tornozelo

AUTOR(ES)
DATA DE PUBLICAÇÃO

2004

RESUMO

Ankle sprain are among the most common injuries during athletic activities. Despite extensive clinical and basic science research, the recurrence rate remains high. Prevention of ankle sprain is only possible once risk factors had been identified. Changes in foot positioning, impaired proprioception, mechanical lateral ankle laxity and muscle strength deficits are possible ankle sprain risk factors, but its real mechanisms remain unclear. Understanding such mechanisms will help health professionals, mainly physiotherapists, identify where to focus treatment efforts, leading to more effective rehabilitation. The aim of this study was to evaluate mechanical and electromyographic factors associated with ankle sprain. Thirty-two basketball and volleyball female athletes (16.06±0.8 years; 67.63±8.17 kg; 177.8±6.47 cm) participated in this study. Their ankles were divided into two groups: a symptom-free control group (29) and athletes who had suffered ankle sprain (29). Assessment of hindfoot alignment was performed by means of photogrammetry SAPO® v.0.63 software, with the athletes standing up. The proprioception, resistive torque at maximum passive ankle movement and muscle strength were assessed on the Biodex® isokinetic dynamometer and the surface electromyographic activity through the Noraxon® system. The joint position sense (15° inversion, 0°, 15° eversion), kinesthesia (2°/s, 4°/s, 10°/s) and resistive torque (5°/s, 10°/s, 20°/s), were evaluated during passive ankle inversion and eversion movements. Evertor and invertor torques were assessed isometrically (15° inversion, 0°, 15° eversion), concentrically and eccentrically (60°/s, 180°/s, 300°/s) measured simultaneously with electromyographic signal of peroneus longus and tibialis anterior muscles. The data were analyzed using 2 and 3-way ANOVA with Tukeys test for post hoc analysis. The results showed that the hindfoot alignment and the joint position sense were not associated with the ankle sprain in female athletes. The results of the ankle sprain group showed significant differences from the control group: delay in the time to detection passive motion, lower resistive torque and lower isometric and concentric torque. In addition, the electromyographic activity of peroneus longus and tibialis anterior muscles during isokinetic concentric test was lower in the ankle sprain group. Based on these results, the athletes who had ankle sprain have proprioceptives deficits, mechanical laxity and muscle weakness.

ASSUNTO(S)

tornozelo instabilidade articular joint instability ankle torque sports torque electromyography entorses e distensões proprioception esportes propriocepção eletromiografia sprains and strains

ACESSO AO ARTIGO

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