| Autor: |
Hunt, Kenneth J., Stone, Barry, Negård, Nils-Otto, Schauer, Thomas, Fraser, Matthew H., Cathcart, Andrew J., Ferrario, Chiara, Ward, Susan A., Grant, Stan |
| Předmět: |
|
| Zdroj: |
IEEE Transactions on Neural Systems & Rehabilitation Engineering; Mar2004, Vol. 12 Issue 1, p89-101, 13p, 11 Black and White Photographs, 3 Diagrams, 28 Graphs |
| Abstrakt: |
Aim: The aim of this study was to investigate feedback control strategies for integration of electric motor assist and functional electrical stimulation (FES) for paraplegic cycling, with particular focus on development of a testbed for exercise testing in FES cycling, in which both cycling cadence and workrate are simultaneously well controlled and contemporary physiological measures of exercise performance derived. A second aim was to investigate the possible benefits of the approach for mobile, recreational cycling. Methods: A recumbent tricycle with an auxiliary electric motor is used, which is adapted for paraplegic users, and instrumented for stimulation control. We propose a novel integrated control strategy which simultaneously provides feedback control of leg power output (via automatic adjustment of stimulation intensity) and cycling cadence (via electric motor control). Both loops are designed using system identification and analytical (model-based) feedback design methods. Ventilatory and pulmonary gas exchange response profiles are derived using a portable system for real-time breath-by-breath acquisition. Results: We provide indicative results from one paraplegic subject in which a series of feedback-control tests illustrate accurate control of cycling cadence, leg power control, and external disturbance rejection. We also provide physiological response profiles from a submaximal exercise step test and a maximal incremental exercise test, as facilitated by the control strategy. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
|
