Recovery from Whole Body Angular Momentum Perturbations During Walking

23 Pages Posted: 17 Mar 2022

See all articles by Michelle van Mierlo

Michelle van Mierlo

affiliation not provided to SSRN

Jolien I. Ambrosius

affiliation not provided to SSRN

Mark Vlutters

affiliation not provided to SSRN

Edwin H.F. van Asseldonk

affiliation not provided to SSRN

Herman van der Kooij

affiliation not provided to SSRN

Abstract

Healthy individuals highly regulate their whole body angular momentum (WBAM) during walking. Since WBAM regulation is essential in maintaining balance, a better understanding is required on how healthy individuals recover from WBAM perturbations. We therefore studied how healthy individuals recover WBAM in the sagittal plane. WBAM can be regulated by adjusting the moment arm of the ground reaction force (GRF) vector with respect to the whole-body centre of mass (CoM). In principle this can be done by centre of pressure (CoP) modulation and/or adjustments of the GRF direction. Two simultaneous perturbations of the same magnitude were applied in opposite direction to the pelvis and upper body (0.34 m apart) to perturb WBAM but not the whole body linear momentum (WBLM), while participants walked on a treadmill. The perturbations were given at toe off right, had a magnitude of 4, 8, 12 and 16% of the participant’s body weight, and lasted for 150 ms. A recovery of the WBAM was seen directly after the perturbations, induced by adapting the moment arm of the GRF with respect to the CoM. The hip joint of the stance leg played an important role in achieving the WBAM  recovery. A change in the direction of the GRF vector and not a contributing CoP modulation, caused the change in moment arm. However, the change in GRF direction comes from a change in the horizontal GRF, which also affects the WBLM. This suggest that regulating WBAM may take precedence over the WBLM in early recovery.

Keywords: Human balance, Gait, Whole body angular momentum, Centre of pressure modulation, Ground reaction force vector

Suggested Citation

van Mierlo, Michelle and Ambrosius, Jolien I. and Vlutters, Mark and van Asseldonk, Edwin H.F. and van der Kooij, Herman, Recovery from Whole Body Angular Momentum Perturbations During Walking. Available at SSRN: https://ssrn.com/abstract=4059749 or http://dx.doi.org/10.2139/ssrn.4059749

Michelle Van Mierlo (Contact Author)

affiliation not provided to SSRN ( email )

No Address Available

Jolien I. Ambrosius

affiliation not provided to SSRN ( email )

No Address Available

Mark Vlutters

affiliation not provided to SSRN ( email )

No Address Available

Edwin H.F. Van Asseldonk

affiliation not provided to SSRN ( email )

No Address Available

Herman Van der Kooij

affiliation not provided to SSRN ( email )

No Address Available

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