Dynamic similarity during human running: about Froude and Strouhal dimensionless numbers.

Dynamic similarity is a widely used concept in the fluid mechanics field, and consists in placing two different-sized systems in equivalent experimental conditions. This enables removal of the effects of size and prediction of the behavior of a full size system from a scale model. The aim of this study was to test whether the Froude number (Nfr) or the Strouhal number (Str) could be used as a criterion for dynamic similarity during running.

Perceptual and biomechanical variables for running in identical shoe constructions with varying midsole hardness.

OBJECTIVE: Perceptual ratings of mechanical variables were compared with biomechanical variables that are related to running injuries. DESIGN: Eight identical running shoes with a relatively close range of midsole hardness were used. Ground reaction force (GRF), in-shoe pressure distribution and rearfoot motion were measured during running.

Use of Ground Reaction Force Parameters in Predicting Peak Tibial Accelerations in Running.

Ground reaction force data and tibial accelerations from a skin-mounted transducer were collected during rearfoot running at 3.3 m/s across a force platform. Five repetitive trials from 27 subjects in each of 19 different footwear conditions were evaluated.