The influence of ankle inversion angle on trunk muscle activity during squat exercise

Abstract

Objectives: To see the trunk muscle activation during squat exercise in accordance with the inversion angle. Methods/ Statistical Analysis: After previous research, we recruited healthy adult of 12 males and 12 females (The mean age 20.7±1.66, a total of 24 adults) who agreed to participate in this study. This study measured External Oblique abdominis (EO), Transverse Abdominis (TrA), Eractor Spinae (ES), Multifidus (MF) muscle activation during the squat exercise according to four inversion angles (0°, 10°, 15°, 20°). In order to calculate the subject characteristics, the mean value and the standard deviation of all the variables of the subjects, descriptive statistics were employed. One-way repeated ANOVA was used to compare muscle activities of EO, TrA, ES and MF depending on the four inversion angles. Bonferroni's correction was used as post-hoc comparison and statistical significance level was set at a = .05. Findings: In EO, there was significant difference on four inversion angles (p < .001). Post-hoc test result showed significant difference (p < .001) on four inversion angles between 0°-10°, 0°-15°, 0°-20°, 10°-15° and 15°-20°. In TrA, there was significant difference on four inversion angles (p < .001) as well. Post-hoc test result indicated significant difference(p