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Fig. 3. The mean vertical (VGRF, squares), propulsive (+HGRF, triangles) and breaking (-HGRF, circles) forces in xBW versus acceleration. During accelerations, both VGRF and +HGRF increased with acceleration; however, the trend for VGRF was not significant (r2=0.93, P<0.0001; r2=0.23, P=0.072, respectively). During decelerations, only -HGRF was significantly correlated with acceleration (r2=0.89, P<0.0001).