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Purpose – To determine if FES-evoked electromyographic signals (eEMG), collected from paralysed quadriceps muscles, could be used as a proxy of fatigue during FES-induced cycling. Methods – Five subjects with SCI performed one FES-cycling session over 30 min, with the quadriceps muscles being electrically stimulated as the prime agonist. The pedal torques and surface eEMG signals were synchronously recorded for offline analysis. Results – Eight parameters were extracted from eEMG m-waves and processed using Matlab. While pedal torque decayed exponentially over 30-min for all individuals, none of the eEMG parameters followed the same characteristic pattern. A clear change in most of the eEMG curves was detected around the 7th minute of exercise. After analysing data from the onset of exercise until the 7th minute, time variables from the m-waves seem to inversely reflect the decay of torque. From the 7th minute onwards, amplitude and frequency variables showed a moderate correlation with pedal torque. Conclusion – eEMG parameters reflected muscle fatigue only to a limited extent. A high instability period for most of the parameters was observed during the first 7 minutes of exercise.
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