Estigoni, Eduardo H. and Fornusek, Che and Hamzaid, Nur Azah and Hasnan, Nazirah and Smith, Richard M. and Davis, Glen M. (2014) Evoked EMG versus muscle torque during fatiguing functional electrical stimulation-evoked muscle contractions and short-term recovery in individuals with spinal cord injury. Sensors, 14 (12). pp. 22907-22920. ISSN 1424-8220, DOI https://doi.org/10.3390/s141222907.
Full text not available from this repository.Abstract
This study investigated whether the relationship between muscle torque and m-waves remained constant after short recovery periods, between repeated intervals of isometric muscle contractions induced by functional electrical stimulation (FES). Eight subjects with spinal cord injury (SCI) were recruited for the study. All subjects had their quadriceps muscles group stimulated during three sessions of isometric contractions separated by 5 min of recovery. The evoked-electromyographic (eEMG) signals, as well as the produced torque, were synchronously acquired during the contractions and during short FES bursts applied during the recovery intervals. All analysed m-wave variables changed progressively throughout the three contractions, even though the same muscle torque was generated. The peak to peak amplitude (PtpA), and the m-wave area (Area) were significantly increased, while the time between the stimulus artefact and the positive peak (PosT) were substantially reduced when the muscles became fatigued. In addition, all m-wave variables recovered faster and to a greater extent than did torque after the recovery intervals. We concluded that rapid recovery intervals between FES-evoked exercise sessions can radically interfere in the use of m-waves as a proxy for torque estimation in individuals with SCI. This needs to be further investigated, in addition to seeking a better understanding of the mechanisms of muscle fatigue and recovery.
| Item Type: | Article |
|---|---|
| Funders: | UNSPECIFIED |
| Uncontrolled Keywords: | Evoked EMG; fatigue; torque; FES contraction; spinal cord injured |
| Subjects: | R Medicine |
| Divisions: | Faculty of Engineering |
| Depositing User: | Dr Mohd Faizal Hamzah |
| Date Deposited: | 28 Jan 2016 01:29 |
| Last Modified: | 26 Feb 2021 04:29 |
| URI: | http://eprints.um.edu.my/id/eprint/15548 |
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