A novel approach to study human posture control: "Principal movements" obtained from a principal component analysis of kinematic marker data

Journal of Biomechanics
P Federolf

Abstract

Human upright posture is maintained by postural movements, which can be quantified by "principal movements" (PMs) obtained through a principal component analysis (PCA) of kinematic marker data. The current study expands the concept of "principal movements" in analogy to Newton's mechanics by defining "principal position" (PP), "principal velocity" (PV), and "principal acceleration" (PA) and demonstrates that a linear combination of PPs and PAs determines the center of pressure (COP) variance in upright standing. Twenty-one subjects equipped with 27-markers distributed over all body segments stood on a force plate while their postural movements were recorded using a standard motion tracking system. A PCA calculated on normalized and weighted posture vectors yielded the PPs and their time derivatives, the PVs and PAs. COP variance explained by the PPs and PAs was obtained through a regression analysis. The first 15 PMs quantified 99.3% of the postural variance and explained 99.60% ± 0.22% (mean ± SD) of the anterior-posterior and 98.82 ± 0.74% of the lateral COP variance in the 21 subjects. Calculation of the PMs thus provides a data-driven definition of variables that simultaneously quantify the state of the postural system (PPs...Continue Reading

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Citations

Aug 26, 2016·Journal of Sports Sciences·Matteo ZagoChiarella Sforza
Mar 14, 2017·Journal of Sports Sciences·Øyvind GløersenPeter Federolf
Sep 22, 2019·International Journal of Environmental Research and Public Health·Arunee PromsriPeter Federolf
Feb 23, 2020·Medicine and Science in Sports and Exercise·Annemie SmeetsSabine Verschueren
Apr 27, 2019·Frontiers in Neuroinformatics·Thomas H HaidPeter A Federolf
Feb 29, 2020·Brain Sciences·Arunee PromsriPeter Federolf
Dec 22, 2020·Frontiers in Sports and Active Living·Bernd J StetterThorsten Stein
Jan 22, 2021·Clinical Biomechanics·Matteo ZagoManuela Galli
Jul 9, 2021·Frontiers in Bioengineering and Biotechnology·Maurice MohrPeter A Federolf
Nov 24, 2021·Journal of Oral Rehabilitation·Cagla FadilliogluDaniel Hellmann

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