“…Conversely, many studies in the literature were based on comparison of curves peaks (Diamond, et al, 2014;Schwartz, et al, 2008;Stansfield, et al, 2006Stansfield, et al, , 2001aStansfield, et al, , 2001bVan der Linden, Kerr, Hazlewood, Hillman, & Robb, 2002), considering only extreme values of kinematic and dynamic parameters and not the whole curve area (during stance phase). In our study, biomechanical joint strategy evolution with speed was similar whatever the age, despite the existing discrepancies on biomechanical maturation of the joints described in previous studies (Samson, et al, 2009(Samson, et al, , 2013. Nevertheless, the present study pointed out that because very young children principally use their hip joint for gait propulsion (Samson, et al, 2009), they have to recruit their ankle muscles to increase speed and, thus, to produce more positive work.…”