The Elusive Stepping Pattern
Stepping is a class of complex coordinated movements allowing a standing individual to relocate oneself locally with a potentially large body reorientation. Being a key component of numerous higher-level activities, it deserves to be studied for itself. Due to the local nature of the relocation such stepping movement is holonomic, i.e. one exploits fully two degree of mobility of instantaneous translation. This fact clearly contrasts with the sole 1D displacement along the tangent to the body trajectory in the locomotion pattern. Hence, this key difference and the absence of a periodic steady state prevent the analysis of stepping as a variant of the locomotion pattern. In this paper we present a method for recording and analyzing a wide range of stepping movements including two to five steps and reorientations up to 135°.
© Owned by the authors, published by EDP Sciences, 2011