Faulty Hip and Pelvis Biomechanics Do Not Differentiate Between 5k Performance in NCAA Division II Cross-Country Runners

Introduction: Excessive hip adduction (HADD) and contralateral pelvis drop (CPD) angles during running are associated with running-related injuries. Their influence on performance is less known. Therefore, we aimed to determine if HADD and CPD could differentiate between high and low race performers, and if there were relationships between CPD, HADD and race performance. Methods:  Twenty-six healthy male and female NCAA Division II cross-country runners participated in this prospective study. They underwent 3D motion analysis of their HADD and CPD during pre-participation physical examinations. Times from the first race of the season were converted to International Association of Athletics Federation (IAAF) points and high and low performance groups were created. Pearson correlation coefficients were used to examine the associations between HADD, CPD and IAAF points, and Independent Samples T-tests were used to determine differences in HADD and CPD between high and low performance groups. Results: There were no significant relationships between IAAF points and left HADD (r=0.11, p=0.59), right HADD (r=0.19, p=0.35), left CPD (r=-0.06, p=0.79), or right CPD (r=-0.06, p=0.76). There were no significant differences between high and low performance groups in left HADD (t(24)=0.48, p=0.64), right HADD (t(24)=0.45, p=0.33), left CPD (t(24)=0.62, p=0.27), or right CPD (t(24)=0.53, p=0.30). Conclusions: The RRI biomechanics of excessive CPD and HADD do not influence 5k race performance in collegiate distance runners.