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. Author manuscript; available in PMC: 2008 Jan 1.
Published in final edited form as: J Biomech. 2007 Feb 15;40(12):2723–2730. doi: 10.1016/j.jbiomech.2006.12.008

Fig. 3.

Fig. 3

Sensitivity analyses of the COP offset as a function of the acceleration (ax = −10 to 20 m/s2), the coefficient of friction (μ = 0.02: the left column and 0.04: the right column). Other parameters evaluated include (a) mass (m = 2.5, 5.0, and 7.5 kg), (b) the vertical dimension (H = 0.05, 0.10, and 0.15 m), (c) COM position (σ = 0.25, 0.5, and 0.75), (d) landing position (u = −0.15, 0, and 0.15 m), and (e) the vertical force (Fz1 = 500, 700, and 900 N). The offset is positive when the uncorrected COP of Fz2 is anterior to the corrected COP of Fz1; and u is positive when the foot lands anterior to the COM. Where not specified, m = 2.5 kg, H = 0.05 m, σ = 0.25, u = −0.15 m, and Fz1 = 700 N.