Stroke is a leading cause of hemiparesis usually exhibiting asymmetrical movement pattern [1], which is the main goal of neurorehabilitation. Gait training and cycling exercise are common physical therapy treatments that help stroke patients to recover the ability of walking. Electrical stimulation (ES)-assisted cycling has been identified as training protocol during bedridden in acute stage or before ambulation training in stroke patients [2]. However, the training paradigms of ES-assisted cycling for stroke patients in varied stages have not yet come into clinical acceptance in scientific base which might be due to difficulties in time-course assessment of stroke recovery. Also, many studies intended to have stimulation induce muscle contraction but suitable intensity is difficult to define [3]. Moreover, too high intensity of stimulation may cause pain to subjects which could interfere cycling movements. Recent years, low intensity of stimulation has been proposed in isometric contraction...

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