Abstract
[Purpose] The aim of this study was to investigate isometric internal and external rotation torques of the hip at three different flexed positions of the hip. [Subjects] Twenty healthy university students. [Methods] Isometric internal and external maximum rotation torques of the hip on both sides were measured using a torque machine in the recumbent, semi-recumbent and sitting positions. Dependent variables were the isometric internal and external rotation peak torques of the hip. Independent variables were the three testing positions and each side. Measured data were analyzed using two-way analysis of variance with a post-hoc test. [Results] Mean isometric internal rotation torque was significantly higher in the sitting position than in the recumbent or semi-recumbent positions. Torque was also significantly higher in the semi-recumbent position than in the recumbent position. No interaction between testing position and leg side was found. Regarding isometric external rotation, no interaction or main effects were found among the three positions. [Conclusion] Isometric hip internal rotation torque significantly increased as the hip flexed; however, external rotation did not change significantly.
