To explore the mechanisms underlying exercise-induced local muscle fatigue in patients with idiopathic Parkinson＇s disease （PD）,we used surface electromyography to record myoelectric signals from the tibialis anter...To explore the mechanisms underlying exercise-induced local muscle fatigue in patients with idiopathic Parkinson＇s disease （PD）,we used surface electromyography to record myoelectric signals from the tibialis anterior muscle during isometric contraction-induced fatigue until exhaustion.The results revealed no significant differences between patients with idiopathic PD and healthy controls in maximum voluntary contraction of the tibialis anterior muscle.The basic characteristics of surface electromyography were also similar between the two groups.The duration of isometric contraction at 50% maximum voluntary contraction was shortened in PD patients.In addition,PD patients exhibited a stronger increase in mean square amplitude,but a weaker decrease in median frequency and mean power frequency compared with healthy controls during isometric contraction.The skeletal muscles of PD patients revealed specificity of surface electromyography findings,indicating increased fatigability compared with healthy controls.展开更多
This pilot study presents a novel application of high density surface electromyography(EMG)decomposition in pediatric patients,with a view toward promoting its potential clinical application for examination of pediatr...This pilot study presents a novel application of high density surface electromyography(EMG)decomposition in pediatric patients,with a view toward promoting its potential clinical application for examination of pediatricneuromuscular diseases.Automatic progressive FastICA peel-off(APFP)framework was used to decompose high density surface EMG signals recorded from the first dorsal interosseous and abductor pollicis brevis muscles ofchildren with spinal muscular atrophy.The performance of the decomposition with reduced EMG recordingchannels was also investigated.In total 131 motor units were extracted from 15 trials of 64-channel(8×8)surface EMG.The decomposition yield reduced to 102 motor units when 36-channel(6×6)was used,amongwhich 84 motor units were common ones with an average matching rate of(95.68±5.26)%.The decompositionyield further reduced to 65 motor units when only 16-channel(4×4)was used,among which 57 were common ones with an average matching rate of(95.99±4.56)%.These results indicate that using the APFP frameworksingle motor unit activity can be reliably and automatically extracted from pediatric surface EMG signals recordedby an electrode array,which can facilitate potential clinical application of surface EMG as an alternative or supplement to invasive needle EMG for examination of neuromuscular diseases in children.展开更多
文摘To explore the mechanisms underlying exercise-induced local muscle fatigue in patients with idiopathic Parkinson＇s disease （PD）,we used surface electromyography to record myoelectric signals from the tibialis anterior muscle during isometric contraction-induced fatigue until exhaustion.The results revealed no significant differences between patients with idiopathic PD and healthy controls in maximum voluntary contraction of the tibialis anterior muscle.The basic characteristics of surface electromyography were also similar between the two groups.The duration of isometric contraction at 50% maximum voluntary contraction was shortened in PD patients.In addition,PD patients exhibited a stronger increase in mean square amplitude,but a weaker decrease in median frequency and mean power frequency compared with healthy controls during isometric contraction.The skeletal muscles of PD patients revealed specificity of surface electromyography findings,indicating increased fatigability compared with healthy controls.
基金The National Basic Research Program of China(973Program)(No.2005CB724303)the Natural Science Foundation of Shanghai(No.09ZR1409600)the Shanghai Leading Academic Discipline Project(No.B412)
基金This study was supported by the Natural Science Foundation of Shandong Province under Grant ZR2020KF012.The authors would like to thank Faezeh Jahanmiri-Nezhad,PhD and Xiaoyan Li,PhD for their help in data collection.
文摘This pilot study presents a novel application of high density surface electromyography(EMG)decomposition in pediatric patients,with a view toward promoting its potential clinical application for examination of pediatricneuromuscular diseases.Automatic progressive FastICA peel-off(APFP)framework was used to decompose high density surface EMG signals recorded from the first dorsal interosseous and abductor pollicis brevis muscles ofchildren with spinal muscular atrophy.The performance of the decomposition with reduced EMG recordingchannels was also investigated.In total 131 motor units were extracted from 15 trials of 64-channel(8×8)surface EMG.The decomposition yield reduced to 102 motor units when 36-channel(6×6)was used,amongwhich 84 motor units were common ones with an average matching rate of(95.68±5.26)%.The decompositionyield further reduced to 65 motor units when only 16-channel(4×4)was used,among which 57 were common ones with an average matching rate of(95.99±4.56)%.These results indicate that using the APFP frameworksingle motor unit activity can be reliably and automatically extracted from pediatric surface EMG signals recordedby an electrode array,which can facilitate potential clinical application of surface EMG as an alternative or supplement to invasive needle EMG for examination of neuromuscular diseases in children.
文摘目的通过对比不同负荷认知双任务行走和运动双任务行走时下肢表面肌电(surface electromyography,sEMG)信号及动态稳定性的差异,探究不同类型和负荷双任务对健康人动态姿势控制的影响。方法利用无线sEMG测试仪和三维运动捕捉系统同时采集28名受试者不同负荷认知双任务行走和运动双任务行走时平均肌电(average electromyography,AEMG)和动态稳定性指标。采用双因素重复测量方差分析任务类型(认知任务和运动任务)和任务负荷(简单任务和困难任务)对人体下肢sEMG和动态稳定性的影响以及两者之间的交互作用。结果简单负荷行走时,左右股二头肌和右胫前肌AEMG均小于困难负荷行走(P<0.05),左胫前肌简单运动双任务行走时AEMG小于困难运动双任务行走(P<0.05)。右腓肠肌困难认知双任务行走时AEMG小于困难运动双任务行走(P<0.05),简单认知双任务行走时AEMG大于困难认知双任务行走(P<0.05),简单运动双任务行走时AEMG小于困难运动双任务行走(P<0.05);简单认知双任务行走动态稳定裕度(margins of stability,MoS)大于简单运动双任务行走(P<0.05),困难认知双任务行走MoS小于困难运动双任务行走(P<0.05),简单运动双任务行走MoS小于困难运动双任务行走(P<0.05)。结论不同类型和负荷双任务对动态姿势控制的影响存在交互效应。困难运动双任务行走时踝关节周围肌肉的神经肌肉控制和动态稳定性强于困难认知双任务行走,困难运动双任务行走时踝关节周围肌肉的神经肌肉控制和动态稳定性强于简单运动双任务行走。
