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Introduction: The elastic bandage can increase muscle excitability and generate a synchronization of motor units and may improve muscle activation. But it is unclear what role this therapeutic intervention in the prevention of sports injuries such as ankle sprain. Objective: Analyze the effect of elastic bandage on the activation of the muscles of the ankle during functional testing in Crossfit athletes. Methods: participated in the study 21 athletes of both sexes, aged between 18 and 35 years, no injury history in the lower limbs in the three months previous history to the study. In the first data collection were conducted: a history, specific orthopedic tests (test of drawer and talar tilt), maximum voluntary isometric contraction (MVIC) of each muscle to normalization of electromyography (EMG) and familiarization tests. For each test two repetitions with bandages and two without bandage. For the collection of the EMG signals were considered signs of muscles: gastrocnemius medial head and tibialis anterior. The EMG signals were rectified, smoothed and EMG data collected during the jump were analyzed in three stages: impulse, flight and landing. The average was normalized by MVIC. Results: Test ANOVA one-way and post hoc Bonferroni. For the jump on one leg, in the impulse phase, a significant difference (p = 0.017), with greater activation in the condition with bandage, the tibialis anterior muscle. Conclusion: The electromyography activation increased bandage of tibialis anterior, during impulse phase of a jump. However maybe there is a therapeutic resource limitation in terms of prevention of sprains. [ABSTRACT FROM AUTHOR]

Introduction: The imbalance in the activation of the stabilizing muscles of the scapula, upper trapezius (TS), lower trapezius (IT) and serratus anterior (SA) can lead to scapular dyskinesia (SD). Whereas this dysfunction as a functional limiting potential, the use of oscillatory rods (OR) is interesting, as it's promising in adjusting the neuromuscular control provided by this therapeutic resource. Objectives: To analyze the acute effects of exercises with OR in the activation of scapular stabilizer muscles in individuals with and without asymptomatic SD Methods: The study included 26 university students (18-25 years). The volunteers were divided into two groups: group with dyskinesia (GWD = 10) and group without dyskinesia (GWD = 16). Electromyography (EMG) surface was performed in UT muscles, LT and SA during three maximal voluntary isometric contractions for each muscle, to normalize the electromyographic data, and over 10 movements scaption. Afterwards, they were performed: familiarization, exercises protocol and reevaluation. The data were filtered, rectified and smoothed to create the linear envelope. The t-Student test was used for comparisons. The level of significance was set at p <0.05. Results: Activation of LT was 27.8% higher in the GWD after performing the exercises (p = 0.03). Conclusion: The exercise protocol was able to increase muscle activation of LT in GWD. [ABSTRACT FROM AUTHOR]

Introduction: Alterations in the recruitment pattern of lower trapezius (LT), serratus anterior (SA) and upper trapezius (UT) are considered one of the main causes of scapular dyskinesis1. This dysfunction was associated with occurrence of shoulder disorders2. However, it is not know any study that measure the activation of those muscles in individuals clinically classified with dyskinesis. Objective: Analyze the electromyography activation of the scapular stabilizer muscles in asymptomatic individuals with and without scapular dyskinesis. Methods: Participated in this research 36 volunteers not engaged in treatment for shoulder disorders, without previous surgery and injuries in the shoulder divided in two groups: Dyskinesis (GD=18) and Countrol (n=17). The surface electromyography signals (EMG) were collected by a biological signal acquisition module (Noraxon surface, Arizona, USA) during 10 scaption movements loaded with 5% of body body mass standardized by a metronome at 23bpm. The elctrodes were positioned as the SENIAM guideline for TS and TI, and previous literature for SA4. The EMG signal were rectified and softened for the creation of the linear envelope and this one were normalized by by the mean of 3 Maximal Isometric voluntary contractions. For the statistic analyze the Shapiro-Wilk test were used followed by the t-Student test for independent means. The significance level were adjusted in p < 0.05. Results: The UT activation was 92,37% higher in the (GD) compared to the CG (p=0,013). Conclusion: asymptomatic individuals with scapular dyskinesis have more UT activation when compared to individuals without dyskinesis. [ABSTRACT FROM AUTHOR]