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Robotic devices have been used successfully in assisted rehabilitation to increase, in continuity and intensity, the effects of neuromuscular stimulation. However, information resulting from the Patient-Robot interaction is not yet analyzed for diagnosis purposes. The neuromuscular reaction to a controlled stimulation, measured in terms of physiologic and mechanic variables, can be used to establish...
Neural-musculoskeletal models play a significant role in the interactions between human and robotic devices. Surface Electromyography (sEMG) can effectively measure the electric signal from human muscle and provide useful information for improving the accuracy of human-machine interfaces. This paper summarizes three main sEMG-based research methods at present, establishes the flowchart for sEMG-based...
Knowing the neuromuscular admittance of drivers helps understanding how drivers adapt to different steering wheel configurations. System identification allows, through force perturbations on the steering wheel, for identification of endpoint admittance. Design of the forcing function can greatly influence the obtained results. We conducted an experiment to investigate the effects of frequency content...
Continuous haptic feedback can improve manual control task performance and application methods on steering wheel (haptic steering guidance) have been studied. However, the current haptic steering guidance systems assume there is an average, constant driver's response to force (which can be quantified as the admittance). To improve the performance of haptic steering guidance, the guidance system should...
Reduction in the median frequency and the amplitude of surface electromyogram (sEMG) has been observed among older subjects compared with the younger cohort. These changes in sEMG have been associated with a reduction in the number of muscle fibers and a drop in the ratio of type II muscle fibers. However, the details of this association are not known. This paper has experimentally determined the...
Ten female individuals (age = 21 ± 2 years; weight = 50 ± 2 kg; height = 160 ± 3 cm) were analyzed. For the determination of the electromyographic fatigue threshold (EMGft), four percentages of load (10, 20, 30 and 40%), in relation the maximum voluntary contraction (MVC) were used, until the subjective exhaustion. The biosignals in these percentages had been linearly adjusted in domain of the number...
With the aim to control a multiple degrees of freedom electromechanical devices, e.g., assistive robots, powered wheelchair, etc., this paper proposes a real-time multichannel surface electromyography classification scheme based on the coordination or synergies between a functional group of muscles: biceps brachii, triceps brachii, pronator teres, and brachioradialis. The muscular synergy is evaluated...
Resistance exercise is essential to improve or maintain muscle performance. Vibration training has been suggested as an alternative option for muscle conditioning, aiming especially at improving muscle strength and power. Several studies link the effects of vibration training to enhanced neuromuscular stimulation, measured by electromyography (EMG) and typically ascribed to involuntary reflex mechanisms...
Neuromuscular stimulation has become a central technique for research and clinical efforts in rehabilitation, but available devices still do not show the needed performance in strength and selectivity for this approach. However, the knowledge about the exact intramuscular structure formed by the axons, muscle fibers with their different metabolism types and properties as well as the motoric endplates...
A simple online system for collecting EMG data from surface recording electrodes and force data has been developed to study muscular weakness in multiple sclerosis (MS) patients and children. The parameters of force, integrated EMG, peak positive and negative amplitudes and zero-crossing frequencies are simultaneously recorded. Leg measurements show clear quantifiable differences between normal muscles...
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