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. 2012 Dec 20;7(12):e51888. doi: 10.1371/journal.pone.0051888

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© 2012 Qiao, Jindrich

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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Measured body pitch angle ϕ(t) (A), and angular speed (B) during stance. Line colors corresponded to the tasks (Black: ACC; red: CSR; blue: DEC; magenta: SU; green SD). For ϕ(t) the reference angles ϕ_d from each task are indicated by the dashed horizontal lines. Pitch angle ϕ(t) (C) and angular speed (D) predicted by Eq. 2 in stance. Each trial was simulated from the initial conditions of ϕ and at TD. For each participant the simulation was implemented under ode45 function of MATLAB . J is the pitch moment of inertia of the upper extremities relative to the hip in the sagittal plane. M_g is the moment relative to hip caused by the upper body’s COM, and M_acc is the moment relative to the hip caused by the acceleration of upper body’s COM in the sagittal plane. For each participant all trials within each task were averaged, then averaged across all participants within a task. Shaded areas indicate mean±s.e.m.

Inline graphic — Measured body pitch angle ϕ(t) (A), and angular speed (B) during stance. Line colors corresponded to the tasks (Black: ACC; red: CSR; blue: DEC; magenta: SU; green SD). For ϕ(t) the reference angles ϕ_d from each task are indicated by the dashed horizontal lines. Pitch angle ϕ(t) (C) and angular speed (D) predicted by Eq. 2 in stance. Each trial was simulated from the initial conditions of ϕ and at TD. For each participant the simulation was implemented under ode45 function of MATLAB . J is the pitch moment of inertia of the upper extremities relative to the hip in the sagittal plane. M_g is the moment relative to hip caused by the upper body’s COM, and M_acc is the moment relative to the hip caused by the acceleration of upper body’s COM in the sagittal plane. For each participant all trials within each task were averaged, then averaged across all participants within a task. Shaded areas indicate mean±s.e.m.