Abstract
Functional Electrical Stimulation (FES) is one method available for rehabilitation of spinal cord injured subjects. Although FES is used in the clinic today, reliable and robust feedback for a closed-loop system is limited.
The objective was to examine if intramuscular electromyographic (iEMG) recordings (of tibialis anterior and gastrocnemius medialis) can provide reliable information of functional movement (i.e. ankle angle) during development of fatigue.
Four longitudinal intrafascicular electrodes (LIFEs) were implanted in two fascicles of the sciatic nerve in three adult Sprague-Dawley rats. Open-loop FES was applied to produce rhythmic ankle movement. The FES stimulation pulse widths and amplitudes were determined for the individual rats based on the strength duration curve. Each frequency (30, 40, 50, 60 and 70 Hz) was applied to perform 100 step cycles followed by a 15 min rest period. Kinematic information on the ankle angle and iEMG were recorded simultaneously.
The results showed that the ankle angle and the iEMG amplitude decreased when the muscles fatigued. A correlation between the ankle angle and iEMG was present, which indicates that iEMG information can be used as feedback for a closed-loop system. The correlation was higher at higher stimulation frequencies (>0.76 at stimulation frequencies above 40 Hz).
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Lykholt, L.E., Ganeswarathas, S., Thota, A.K., Harreby, K.R., Jung, R. (2014). Information on Ankle Angle from Intramuscular EMG Signals during Development of Muscle Fatigue in an Open-Loop Functional Electrical Stimulation System in Rats. In: Jensen, W., Andersen, O., Akay, M. (eds) Replace, Repair, Restore, Relieve – Bridging Clinical and Engineering Solutions in Neurorehabilitation. Biosystems & Biorobotics, vol 7. Springer, Cham. https://doi.org/10.1007/978-3-319-08072-7_78
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DOI: https://doi.org/10.1007/978-3-319-08072-7_78
Publisher Name: Springer, Cham
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