Balance control is one of the crucial challenges in bipedal locomotion. Humans need to maintain their trunk upright while the body behaves like an inverted pendulum which is inherently unstable. Instead, the virtual pivot point (VPP) concept introduced a new virtual pendulum model to the human balance control paradigm by analyzing the ground reaction forces (GRF) in the body coordinate frame. This paper presents novel VPP-based analyses of the postural stability of human running in a 3D space. We demonstrate the relation between the VPP position and the gait speed. The experimental results suggest different control strategies in frontal and sagittal planes. The ground reaction forces intersect below the center of mass in the sagittal plane and above the center of mass in the frontal plane. These VPP locations are found for the sagittal and frontal planes at all running speeds, respectively. We introduced a 3D VPP-based model which can replicate the kinematic and kinetic behavior of human running. The similarity between the experimental and simulation results indicates the ability of the VPP concept in predicting human balance control in running and can support its applicability for gait assistance.
Human balance control in 3D running based on virtual pivot point concept
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- Funder(s): Deutsche Forschungsgemeinschaft
- Award Id(s): AH307/2-1
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- Version of Record 22 February 2022
- Accepted Manuscript 18 January 2022
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Vahid Firouzi, Fariba Bahrami, Maziar A. Sharbafi; Human balance control in 3D running based on virtual pivot point concept. J Exp Biol 2022; jeb.243080. doi: https://doi.org/10.1242/jeb.243080
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