Regulation of multijoint stretch reflexes during interactions with stiff and compliant environments

Eric Perreault*, Kuifu Chen, Gwyn N. Lewis

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Scopus citations

Abstract

The purpose of this study was to examine how multijoint stretch reflexes are modulated during interactions with stiff and compliant environments. Reflex responses were elicited using a 3D robotic manipulator to perturb arm posture in the three degrees of freedom relevant to functional behaviors. The robot applied controlled displacements and simulated environments with different stiffnesses. Stiff (10kN/m) and compliant (10N/m) environments were used. Perturbation characteristics were matched across environments. Reflex responses were monitored using surface electromyograms from 8 upper limb muscles. Data were collected from 9 subjects. Significant stretch reflex responses were observed in all muscles and these were significantly modulated by the environmental stiffness. This modulation was due to increased levels of background muscle activity in the compliant environment and to increased reflex sensitivity at matched levels of muscle activation. These results suggest that the neuromotor control system uses both feedforward and feedback mechanisms to compensate for changes in environmental compliance.

Original languageEnglish (US)
Title of host publication28th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS'06
Pages300-302
Number of pages3
DOIs
StatePublished - Dec 1 2006
Event28th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS'06 - New York, NY, United States
Duration: Aug 30 2006Sep 3 2006

Other

Other28th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS'06
CountryUnited States
CityNew York, NY
Period8/30/069/3/06

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ASJC Scopus subject areas

  • Bioengineering

Cite this

Perreault, E., Chen, K., & Lewis, G. N. (2006). Regulation of multijoint stretch reflexes during interactions with stiff and compliant environments. In 28th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS'06 (pp. 300-302). [4030336] https://doi.org/10.1109/IEMBS.2006.260098