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3.1 | General notations In the following, we assume that the recorded COP trajec- tory contains N data points, sampled at constant frequency F%. T=N/F, denotes the total duration of the signal in sec- onds (Table 2). For each 15nSN, ML,, (respectively AP) denotes the coordinate of the COP position at time n/F, on the ML axis, from left to right, (respectively the AP axis, from backward to forward). Then for each 1 SSN N X = MLA Σ ML, N and Y = AP ΣΑΡ, =1 represent the coordinates of the centered trajectories on the ML axis and AP axis, respectively. We also introduce the Radius signal (R,Disns as the Euclidean distance of the centered COP to the origin: for each 1 sn SN, R, = v+ Y x