Electrode placement on the forearm for selective stimulation of finger extension/flexion
| Autor: | Xue-Liang Bao, Yunlong Wang, Xiaoying Lü, Jian-Jun Zhang, Yu-Xuan Zhou, Zhigong Wang |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Male
030506 rehabilitation Muscle Physiology Physiology lcsh:Medicine Stimulation Hands Wrist Pathology and Laboratory Medicine 0302 clinical medicine Medicine and Health Sciences Thumbs lcsh:Science Musculoskeletal System Fatigue Forearms Multidisciplinary Little finger Organ Size Biomechanical Phenomena Arms Forearm medicine.anatomical_structure Female medicine.symptom Anatomy 0305 other medical science Muscle contraction Research Article Muscle Contraction Adult Materials science Movement Surgical and Invasive Medical Procedures Thumb Fingers 03 medical and health sciences Young Adult Signs and Symptoms Diagnostic Medicine medicine Functional electrical stimulation Humans Muscle Skeletal Electrodes Analysis of Variance Functional Electrical Stimulation lcsh:R Limbs (Anatomy) Biology and Life Sciences Electric Stimulation Intensity (physics) body regions lcsh:Q 030217 neurology & neurosurgery Biomedical engineering |
| Zdroj: | PLoS ONE PLoS ONE, Vol 13, Iss 1, p e0190936 (2018) |
| ISSN: | 1932-6203 |
| Popis: | It is still challenging to achieve a complex grasp or fine finger control by using surface functional electrical stimulation (FES), which usually requires a precise electrode configuration under laboratory or clinical settings. The goals of this study are as follows: 1) to study the possibility of selectively activating individual fingers; 2) to investigate whether the current activation threshold and selective range of individual fingers are affected by two factors: changes in the electrode position and forearm rotation (pronation, neutral and supination); and 3) to explore a theoretical model for guidance of the electrode placement used for selective activation of individual fingers. A coordinate system with more than 400 grid points was established over the forearm skin surface. A searching procedure was used to traverse all grid points to identify the stimulation points for finger extension/flexion by applying monophasic stimulation pulses. Some of the stimulation points for finger extension and flexion were selected and tested in their respective two different forearm postures according to the number and the type of the activated fingers and the strength of finger action response to the electrical stimulation at the stimulation point. The activation thresholds and current ranges of the selectively activated finger at each stimulation point were determined by visual analysis. The stimulation points were divided into three groups ("Low", "Medium" and "High") according to the thresholds of the 1st activated fingers. The angles produced by the selectively activated finger within selective current ranges were measured and analyzed. Selective stimulation of extension/flexion is possible for most fingers. Small changes in electrode position and forearm rotation have no significant effect on the threshold amplitude and the current range for the selective activation of most fingers (p > 0.05). The current range is the largest (more than 2 mA) for selective activation of the thumb, followed by those for the index, ring, middle and little fingers. The stimulation points in the "Low" group for all five fingers lead to noticeable finger angles at low current intensity, especially for the index, middle, and ring fingers. The slopes of the finger angle variation in the "Low" group for digits 2~4 are inversely proportional to the current intensity, whereas the slopes of the finger angle variation in other groups and in all groups for the thumb and little finger are proportional to the current intensity. It is possible to selectively activate the extension/flexion of most fingers by stimulating the forearm muscles. The physiological characteristics of each finger should be considered when placing the negative electrode for selective stimulation of individual fingers. The electrode placement used for the selective activation of individual fingers should not be confined to the location with the lowest activation threshold. |
| Databáze: | OpenAIRE |
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