Abstract
Does the psoas major muscle, which acts on the hip flexion, play an important role in sprinting performance? No studies have ever tried to examine this point. The purpose of this study was to investigate the relationships between cross-sectional area (CSA) and strength of psoas major muscle and sprinting performance in elite sprinters. Subjects were 13 top sprinter males. An axial image, which corresponds to crista iliaca., was obtained to calculate CSA of psoas major muscle using MRI. Peak torques of isokinetic strength during hip flexion were measured at angular velocities of 60, 120, and 180 deg/sec. In order to evaluate the sprinting performance, 30 and 60 m sprint times were recorded. There was a significant correlation between CSA of psoas major muscle and sprint time (30 m; r=-0.768, p<0.01, 60 m; r=-0.776, p<0.01). Furthermore, there was a correlation between CSA of psoas major muscle and peak torques of hip flexion at 60, 120, and 180 deg/sec (r=0.644, 0.574, and 0.630, respectively; p<0.05). These results suggest that both morphological and functional characteristics of psoas major muscle have influence on sprinting performance in elite sprinters. And thus psoas major muscle plays an important role.
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