Quantitative Characterization of Steady-State Ankle Impedance With Muscle Activation
Characterization of multi-variable ankle mechanical impedance is crucial to understanding how the ankle supports lower-extremity function during interaction with the environment. This paper reports quantification of steady-state ankle impedance when muscles were active. Vector field approximation of...
| Main Authors: | , , , , |
|---|---|
| Other Authors: | |
| Format: | Article |
| Published: |
ASME International
2018
|
| Online Access: | http://hdl.handle.net/1721.1/119407 https://orcid.org/0000-0001-5366-2145 |
| _version_ | 1811090483644989440 |
|---|---|
| author | Lee, Hyunglae Ho, Patrick Rastgaar Aagaah, Mohammad Krebs, Hermano I Hogan, Neville |
| author2 | Massachusetts Institute of Technology. Department of Mechanical Engineering |
| author_facet | Massachusetts Institute of Technology. Department of Mechanical Engineering Lee, Hyunglae Ho, Patrick Rastgaar Aagaah, Mohammad Krebs, Hermano I Hogan, Neville |
| author_sort | Lee, Hyunglae |
| collection | MIT |
| description | Characterization of multi-variable ankle mechanical impedance is crucial to understanding how the ankle supports lower-extremity function during interaction with the environment. This paper reports quantification of steady-state ankle impedance when muscles were active. Vector field approximation of repetitive measurements of the torque-angle relation in two degrees of freedom (inversion/eversion and dorsiflexion/plantarflexion) enabled assessment of spring-like and non-spring-like components. Experimental results of eight human subjects showed direction-dependent ankle impedance with greater magnitude than when muscles were relaxed. In addition, vector field analysis demonstrated a non-spring-like behavior when muscles were active, although this phenomenon was subtle in the unimpaired young subjects we studied. Copyright © 2010 by ASME. |
| first_indexed | 2024-09-23T14:46:53Z |
| format | Article |
| id | mit-1721.1/119407 |
| institution | Massachusetts Institute of Technology |
| last_indexed | 2024-09-23T14:46:53Z |
| publishDate | 2018 |
| publisher | ASME International |
| record_format | dspace |
| spelling | mit-1721.1/1194072022-10-01T22:26:32Z Quantitative Characterization of Steady-State Ankle Impedance With Muscle Activation Lee, Hyunglae Ho, Patrick Rastgaar Aagaah, Mohammad Krebs, Hermano I Hogan, Neville Massachusetts Institute of Technology. Department of Mechanical Engineering Lee, Hyunglae Ho, Patrick Rastgaar Aagaah, Mohammad Krebs, Hermano I Hogan, Neville Characterization of multi-variable ankle mechanical impedance is crucial to understanding how the ankle supports lower-extremity function during interaction with the environment. This paper reports quantification of steady-state ankle impedance when muscles were active. Vector field approximation of repetitive measurements of the torque-angle relation in two degrees of freedom (inversion/eversion and dorsiflexion/plantarflexion) enabled assessment of spring-like and non-spring-like components. Experimental results of eight human subjects showed direction-dependent ankle impedance with greater magnitude than when muscles were relaxed. In addition, vector field analysis demonstrated a non-spring-like behavior when muscles were active, although this phenomenon was subtle in the unimpaired young subjects we studied. Copyright © 2010 by ASME. 2018-12-04T15:32:52Z 2018-12-04T15:32:52Z 2010-09 2018-11-30T18:33:38Z Article http://purl.org/eprint/type/ConferencePaper 978-0-7918-4417-5 http://hdl.handle.net/1721.1/119407 Lee, Hyunglae, Patrick Ho, Mohammad A. Rastgaar, Hermano Igo Krebs, and Neville Hogan. “Quantitative Characterization of Steady-State Ankle Impedance With Muscle Activation.” Proceedings of the ASME 2010 Dynamic Systems and Control Conference, 12-15 September, Cambridge, Massachusetts, 2010, ASME, 2010. © 2010 by ASME https://orcid.org/0000-0001-5366-2145 http://dx.doi.org/10.1115/DSCC2010-4062 ASME 2010 Dynamic Systems and Control Conference, Volume 1 Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf ASME International ASME |
| spellingShingle | Lee, Hyunglae Ho, Patrick Rastgaar Aagaah, Mohammad Krebs, Hermano I Hogan, Neville Quantitative Characterization of Steady-State Ankle Impedance With Muscle Activation |
| title | Quantitative Characterization of Steady-State Ankle Impedance With Muscle Activation |
| title_full | Quantitative Characterization of Steady-State Ankle Impedance With Muscle Activation |
| title_fullStr | Quantitative Characterization of Steady-State Ankle Impedance With Muscle Activation |
| title_full_unstemmed | Quantitative Characterization of Steady-State Ankle Impedance With Muscle Activation |
| title_short | Quantitative Characterization of Steady-State Ankle Impedance With Muscle Activation |
| title_sort | quantitative characterization of steady state ankle impedance with muscle activation |
| url | http://hdl.handle.net/1721.1/119407 https://orcid.org/0000-0001-5366-2145 |
| work_keys_str_mv | AT leehyunglae quantitativecharacterizationofsteadystateankleimpedancewithmuscleactivation AT hopatrick quantitativecharacterizationofsteadystateankleimpedancewithmuscleactivation AT rastgaaraagaahmohammad quantitativecharacterizationofsteadystateankleimpedancewithmuscleactivation AT krebshermanoi quantitativecharacterizationofsteadystateankleimpedancewithmuscleactivation AT hoganneville quantitativecharacterizationofsteadystateankleimpedancewithmuscleactivation |