Postural stability in human running with step-down perturbations: an experimental and numerical study
Postural stability is one of the most crucial elements in bipedal locomotion. Bipeds are dynamically unstable and need to maintain their trunk upright against the rotations induced by the ground reaction forces (GRFs), especially when running. Gait studies report that the GRF vectors focus around a...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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The Royal Society
2020-11-01
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| Series: | Royal Society Open Science |
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| Online Access: | https://royalsocietypublishing.org/doi/pdf/10.1098/rsos.200570 |
| _version_ | 1818428909523304448 |
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| author | Özge Drama Johanna Vielemeyer Alexander Badri-Spröwitz Roy Müller |
| author_facet | Özge Drama Johanna Vielemeyer Alexander Badri-Spröwitz Roy Müller |
| author_sort | Özge Drama |
| collection | DOAJ |
| description | Postural stability is one of the most crucial elements in bipedal locomotion. Bipeds are dynamically unstable and need to maintain their trunk upright against the rotations induced by the ground reaction forces (GRFs), especially when running. Gait studies report that the GRF vectors focus around a virtual point above the centre of mass (VPA), while the trunk moves forward in pitch axis during the stance phase of human running. However, a recent simulation study suggests that a virtual point below the centre of mass (VPB) might be present in human running, because a VPA yields backward trunk rotation during the stance phase. In this work, we perform a gait analysis to investigate the existence and location of the VP in human running at 5 m s−1, and support our findings numerically using the spring-loaded inverted pendulum model with a trunk. We extend our analysis to include perturbations in terrain height (visible and camouflaged), and investigate the response of the VP mechanism to step-down perturbations both experimentally and numerically. Our experimental results show that the human running gait displays a VPB of ≈−30 cm and a forward trunk motion during the stance phase. The camouflaged step-down perturbations affect the location of the VPB. Our simulation results suggest that the VPB is able to encounter the step-down perturbations and bring the system back to its initial equilibrium state. |
| first_indexed | 2024-12-14T15:09:07Z |
| format | Article |
| id | doaj.art-b49be42493a34645a3709f945fb7ee09 |
| institution | Directory Open Access Journal |
| issn | 2054-5703 |
| language | English |
| last_indexed | 2024-12-14T15:09:07Z |
| publishDate | 2020-11-01 |
| publisher | The Royal Society |
| record_format | Article |
| series | Royal Society Open Science |
| spelling | doaj.art-b49be42493a34645a3709f945fb7ee092022-12-21T22:56:37ZengThe Royal SocietyRoyal Society Open Science2054-57032020-11-0171110.1098/rsos.200570200570Postural stability in human running with step-down perturbations: an experimental and numerical studyÖzge DramaJohanna VielemeyerAlexander Badri-SpröwitzRoy MüllerPostural stability is one of the most crucial elements in bipedal locomotion. Bipeds are dynamically unstable and need to maintain their trunk upright against the rotations induced by the ground reaction forces (GRFs), especially when running. Gait studies report that the GRF vectors focus around a virtual point above the centre of mass (VPA), while the trunk moves forward in pitch axis during the stance phase of human running. However, a recent simulation study suggests that a virtual point below the centre of mass (VPB) might be present in human running, because a VPA yields backward trunk rotation during the stance phase. In this work, we perform a gait analysis to investigate the existence and location of the VP in human running at 5 m s−1, and support our findings numerically using the spring-loaded inverted pendulum model with a trunk. We extend our analysis to include perturbations in terrain height (visible and camouflaged), and investigate the response of the VP mechanism to step-down perturbations both experimentally and numerically. Our experimental results show that the human running gait displays a VPB of ≈−30 cm and a forward trunk motion during the stance phase. The camouflaged step-down perturbations affect the location of the VPB. Our simulation results suggest that the VPB is able to encounter the step-down perturbations and bring the system back to its initial equilibrium state.https://royalsocietypublishing.org/doi/pdf/10.1098/rsos.200570bipedal locomotionhuman runningstep-down perturbationpostural stabilitytslip modelvirtual point (vp, vpp) |
| spellingShingle | Özge Drama Johanna Vielemeyer Alexander Badri-Spröwitz Roy Müller Postural stability in human running with step-down perturbations: an experimental and numerical study Royal Society Open Science bipedal locomotion human running step-down perturbation postural stability tslip model virtual point (vp, vpp) |
| title | Postural stability in human running with step-down perturbations: an experimental and numerical study |
| title_full | Postural stability in human running with step-down perturbations: an experimental and numerical study |
| title_fullStr | Postural stability in human running with step-down perturbations: an experimental and numerical study |
| title_full_unstemmed | Postural stability in human running with step-down perturbations: an experimental and numerical study |
| title_short | Postural stability in human running with step-down perturbations: an experimental and numerical study |
| title_sort | postural stability in human running with step down perturbations an experimental and numerical study |
| topic | bipedal locomotion human running step-down perturbation postural stability tslip model virtual point (vp, vpp) |
| url | https://royalsocietypublishing.org/doi/pdf/10.1098/rsos.200570 |
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