Análise cinemática e eletromiográfica durante o Single Leg Drop Landing Test em corredoras amadoras com e sem valgo dinâmico

Abstract

Running is a popular activity with many health benefits but often associated with injuries. Dynamic knee valgus (DKV), common in women, is a lower limb (LL) behavior that can occur during movement and may increase the risk of injury. The Single Leg Drop Landing Test (SDLT) is able to reproduce what happens in running and investigate the relationship between landing and knee alignment. The aim of the study was to determine whether the presence of the DKV can induce differences in electromyographic (EMG) patterns and the kinematics of the LL. The study analyzed 27 female amateur runners, divided into two groups: with and without DKV. The angles of the LL joints in the sagittal and frontal planes were calculated during the SDLT, and the EMG was calculated in three phases of the SDLT: preparatory phase, initial contact, and return phase. Statistical analysis used Student's t-test, with a significance level of p<0.05. The results showed that the valgus group had less activation of the gluteus medius during the preparatory phase, while the tibialis anterior had its activity increased in the return phase. The valgus group also showed greater angular excursion of the hip in the sagittal and frontal planes. There were no significant differences between the groups in terms of anthropometry, muscle strength, or ground reaction force. We conclude that individuals with DKV have adaptations in the EMG and kinematics of the hip, which may increase the risk of running injuries.