Y balance test kitTM (YBT) is used to measure dynamic balance. YBT is an instrumented version of the Star Excursion Balance test that has Anterior (A), Posteromedial (PM), and Posterolateral (PL) directions. PURPOSE: To determine electromyographic (EMG) activity of the trunk and lower extremity (LE) muscles during YBT performance. METHODS: Surface EMG was collected on 10 males and 10 females healthy adults for the erector spinae (ES), external oblique (EOB), and rectus abdominis (RA) for both ipsilateral (i) and contralateral (c) sides of the stance leg, and gluteus medius (GMED), gluteus maximus (GMAX), Rectus Femoris (RF), Vastus Lateralis (VL), Vastus Medialis (VM), Medial Hamstrings (MH), Biceps Femoris (BF), Anterior Tibialis (AT), and Medial Gastrocnemius (MG) muscles of the stance leg during the performance of the YBT. A 2-way repeated measures analysis of variance (ANOVA) was used to determine the interaction between percentage maximal voluntary isometric contraction and reach directions of the YBT. Separate 1-way repeated measures ANOVA for each muscle was performed to compare the normalized EMG values of the same muscle across the 3 reach directions. Pairwise comparisons were performed using the Sidak post hoc test at an alpha level of .05. RESULTS: The 2-way repeated measures ANOVA with 2 repeated factors, muscle (15 levels) and reach direction (3 levels) interaction was statistically significant (P
Kaur N, Bhanot K, Ferreira G. Trunk and Lower Extremity Muscle Activity During the Y Balance Test in Healthy Adults. 2021.