Inter-Individual Variability in Postural Control During External Center of Mass Stabilization
Understanding the relation between the motion of the center of mass (COM) and the center of pressure (COP) is important to understand the underlying mechanisms of maintaining body equilibrium. One way to investigate this is to stabilize COM by fixing the joints of the human and looking at the corres...
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| Format: | Article |
| Language: | English |
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Frontiers Media S.A.
2022-01-01
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| Series: | Frontiers in Physiology |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/fphys.2021.722732/full |
| _version_ | 1819173987785113600 |
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| author | Daša Gorjan Nejc Šarabon Nejc Šarabon Nejc Šarabon Jan Babič Jan Babič |
| author_facet | Daša Gorjan Nejc Šarabon Nejc Šarabon Nejc Šarabon Jan Babič Jan Babič |
| author_sort | Daša Gorjan |
| collection | DOAJ |
| description | Understanding the relation between the motion of the center of mass (COM) and the center of pressure (COP) is important to understand the underlying mechanisms of maintaining body equilibrium. One way to investigate this is to stabilize COM by fixing the joints of the human and looking at the corresponding COP reactions. However, this approach constrains the natural motion of the human. To avoid this shortcoming, we stabilized COM without constraining the joint movements by using an external stabilization method based on inverted cart-pendulum system. Interestingly, this method only stabilized COM of a subgroup of participants and had a destabilizing effect for others which implies significant variability in inter-individual postural control. The aim of this work was to investigate the underlying causes of inter-individual variability by studying the postural parameters of quiet standing before the external stabilization. Eighteen volunteers took part in the experiment where they were standing on an actuated cart for 335 s. In the middle of this period we stabilized their COM in anteroposterior direction for 105 s. To stabilize the COM, we controlled the position of the cart using a double proportional–integral–derivative controller. We recorded COM position throughout the experiment, calculated its velocity, amplitude, and frequency during the quiet standing before the stabilization, and used these parameters as features in hierarchical clustering method. Clustering solution revealed that postural parameters of quiet standing before the stabilization cannot explain the inter-individual variability of postural responses during the external COM stabilization. COM was successfully stabilized for a group of participants but had a destabilizing effect on the others, showing a variability in individual postural control which cannot be explained by postural parameters of quiet-stance. |
| first_indexed | 2024-12-22T20:31:49Z |
| format | Article |
| id | doaj.art-05961f21ba144a1d8c1badcbc072d2de |
| institution | Directory Open Access Journal |
| issn | 1664-042X |
| language | English |
| last_indexed | 2024-12-22T20:31:49Z |
| publishDate | 2022-01-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Physiology |
| spelling | doaj.art-05961f21ba144a1d8c1badcbc072d2de2022-12-21T18:13:35ZengFrontiers Media S.A.Frontiers in Physiology1664-042X2022-01-011210.3389/fphys.2021.722732722732Inter-Individual Variability in Postural Control During External Center of Mass StabilizationDaša Gorjan0Nejc Šarabon1Nejc Šarabon2Nejc Šarabon3Jan Babič4Jan Babič5Department of Automation, Biocybernetics and Robotics, Laboratory for Neuromechanics and Biorobotics, Jožef Stefan Institute, Ljubljana, SloveniaFaculty of Health Sciences and Andrej Marušicˇ Institute, University of Primorska, Koper, SloveniaInnoRenew CoE, Izola, SloveniaS2P, Science to Practice, d.o.o., Laboratory for Motor Control and Motor Behavior, Ljubljana, SloveniaDepartment of Automation, Biocybernetics and Robotics, Laboratory for Neuromechanics and Biorobotics, Jožef Stefan Institute, Ljubljana, SloveniaFaculty of Electrical Engineering, University of Ljubljana, Ljubljana, SloveniaUnderstanding the relation between the motion of the center of mass (COM) and the center of pressure (COP) is important to understand the underlying mechanisms of maintaining body equilibrium. One way to investigate this is to stabilize COM by fixing the joints of the human and looking at the corresponding COP reactions. However, this approach constrains the natural motion of the human. To avoid this shortcoming, we stabilized COM without constraining the joint movements by using an external stabilization method based on inverted cart-pendulum system. Interestingly, this method only stabilized COM of a subgroup of participants and had a destabilizing effect for others which implies significant variability in inter-individual postural control. The aim of this work was to investigate the underlying causes of inter-individual variability by studying the postural parameters of quiet standing before the external stabilization. Eighteen volunteers took part in the experiment where they were standing on an actuated cart for 335 s. In the middle of this period we stabilized their COM in anteroposterior direction for 105 s. To stabilize the COM, we controlled the position of the cart using a double proportional–integral–derivative controller. We recorded COM position throughout the experiment, calculated its velocity, amplitude, and frequency during the quiet standing before the stabilization, and used these parameters as features in hierarchical clustering method. Clustering solution revealed that postural parameters of quiet standing before the stabilization cannot explain the inter-individual variability of postural responses during the external COM stabilization. COM was successfully stabilized for a group of participants but had a destabilizing effect on the others, showing a variability in individual postural control which cannot be explained by postural parameters of quiet-stance.https://www.frontiersin.org/articles/10.3389/fphys.2021.722732/fullpostural controlinverted pendulumexternal stabilizationhierarchical clusteringpostural variability |
| spellingShingle | Daša Gorjan Nejc Šarabon Nejc Šarabon Nejc Šarabon Jan Babič Jan Babič Inter-Individual Variability in Postural Control During External Center of Mass Stabilization Frontiers in Physiology postural control inverted pendulum external stabilization hierarchical clustering postural variability |
| title | Inter-Individual Variability in Postural Control During External Center of Mass Stabilization |
| title_full | Inter-Individual Variability in Postural Control During External Center of Mass Stabilization |
| title_fullStr | Inter-Individual Variability in Postural Control During External Center of Mass Stabilization |
| title_full_unstemmed | Inter-Individual Variability in Postural Control During External Center of Mass Stabilization |
| title_short | Inter-Individual Variability in Postural Control During External Center of Mass Stabilization |
| title_sort | inter individual variability in postural control during external center of mass stabilization |
| topic | postural control inverted pendulum external stabilization hierarchical clustering postural variability |
| url | https://www.frontiersin.org/articles/10.3389/fphys.2021.722732/full |
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