Influência da utilização da órtese de tornozelo durante atividades do voleibol: avaliação eletromiográfica

Abstract

The ankle sprain is the most frequently found acute injury in volleyball. Aiming to prevent the occurrence of ankle injuries, prophylactic equipment as the bracing had been developed. This study had the purpose to evaluate the performance of the ankle muscles (tibialis anterior, peroneous longus, and medial and lateral gastrocnemius) by measuring the electrical activity in different volleyball activities (vertical jumping and lateral shuffling) with and without using ankle bracing. Nine young female volleyball athletes with ages ranging from 14 to 17 years (x: 15.8 ± 1.3) were evaluated, all of them without previous injuries in the dominant member. Maximal voluntary isometric contractions (MVIC) of each muscle was collected, and after that, the electromyographic activity in different situations with and without using the bracing, randomly. The bracing used had two lateral supports. The electromyographic signal was quantified by the root mean square (RMS), and normalized by the MVIC. Analysis of the variance with repeated measurement was used to verify the difference of the electric activity of the muscles involved in each activity, with and without using the bracing, with 5% (p < 0.05) significance level. It was identified a statistically significant difference in phase I of the jumping in favor of the tibialis anterior (p < 0.001) and in phase II in favor of the three flexors muscles (p < 0.001; p = 0.01; p = 0.003) in both situations, with and without using the bracing. As to the lateral jump activity, a significant difference was observed in the phase of braked in favor of the tibialis anterior and the lateral gastrocnemius (p = 0.013) in both situations. It was found no statistical difference among muscles of the two groups. Results suggest that using the ankle bracing cannot influence the electrical activity of the muscles studied during the vertical jumping and the lateral shuffling.

Effect of Ankle Brace on the Activity and Co-Contraction of Ankle Muscles During Single-Leg Landing

“…In this regard, the mechanism of the bracing effect on the ankle muscles activity has been evaluated. Few researchers have investigated the effect of bracing on the ankle muscles during different tasks [4][5][6][7] and reported contradictory results. Hopper and et al investigated the effect of bracing on the selected muscle activity in netball players in jump landing.…”

“…Cardoso et al indicated that ankle bracing cannot affect the muscles activity during vertical jumping and lateral shuffling [4]. Tesuchida et al reported the effect of bracing on the activity of selected muscles during landing from 30 cm and 50 cm height movements.…”

Efeitos do treinamento proprioceptivo na estabilidade do tornozelo em atletas de voleibol

“…Esta modalidade tem como gestos esportivos uma grande quantidade de saltos repetitivos, em diversos movimentos como o de defesa (bloqueio), os movimentos de armação de jogadas (levantamento) e os movimentos de ataque (saque e finalização das jogadas) 1,2 . Os saltos por sua vez são gestos que no retorno ao solo podem provocar uma inadequada aterrissagem e provocar lesões como as entorses 3,4 Esses gestos tornam-se uma ameaça as articulações dos atletas devido a característica desse esporte ser de uma modalidade que muitas vezes permite o contato entre atletas [1][2][3] . É nesse contato que muitas vezes aparecem as lesões, sendo a entorse a lesão mais frequente e o tornozelo a articulação mais acometida quando comparada com as outras articulações 1,4 .…”

“…Os saltos por sua vez são gestos que no retorno ao solo podem provocar uma inadequada aterrissagem e provocar lesões como as entorses 3,4 Esses gestos tornam-se uma ameaça as articulações dos atletas devido a característica desse esporte ser de uma modalidade que muitas vezes permite o contato entre atletas [1][2][3] . É nesse contato que muitas vezes aparecem as lesões, sendo a entorse a lesão mais frequente e o tornozelo a articulação mais acometida quando comparada com as outras articulações 1,4 . As entorses correspondem a quase 80% dessas lesões e o mecanismo por inversão chega a 90% 5 .…”

Efeito agudo da bandagem elástica no padrão de ativação dos músculos estabilizadores do tornozelo, na cinemática e no desempenho, durante atividades funcionais em jovens adultos ativos

“…The volunteers jumped with countermovement, as high as possible with the aid of the arms during the impulse phase, in a total of five attempts (Cardoso et al, 2005).…”