SURFACE STIFFNESS AFFECTS JOINT LOADING IN RUNNING

Abstract

The purpose of this study was to analyze adaptations in joint loading (joint moments) to running surfaces of different stiffness levels when running barefoot or shod at a speed of 3.5 m/s. Joint moments in the sagittal and frontal plane of movement were calculated using standard inverse procedures using a Vicon Nexus system and a Kistler force platform. Adaptations in joint moments were similar in direction when running on softer surfaces and when running shod compared to barefoot. Surface effects were much higher in barefoot running compared to shod running. Joint moments were increased at the hip and ankle and slightly decreased at the knee when running on harder surfaces or when running barefoot compared to shod. Joint loading adaptations corresponded with adaptations in the runner’s striking behaviour. The results of this study can be used to control loading intensity in the design of training regimes for athletes or recreational runners.