Evoked EMG versus Muscle Torque during Fatiguing Functional Electrical Stimulation-Evoked Muscle Contractions and Short-Term Recovery in Individuals with Spinal Cord Injury

被引:12
作者
Estigoni, Eduardo H. [1 ]
Fornusek, Che [1 ]
Hamzaid, Nur Azah [1 ,2 ]
Hasnan, Nazirah [1 ,3 ]
Smith, Richard M. [1 ]
Davis, Glen M. [1 ,2 ]
机构
[1] Univ Sydney, Fac Hlth Sci, Clin Exercise & Rehabil Unit, Lidcombe, NSW 2006, Australia
[2] Univ Malaya, Fac Engn, Dept Biomed Engn, Kuala Lumpur 50603, Malaysia
[3] Univ Malaya, Fac Med, Dept Rehabil Med, Kuala Lumpur 50603, Malaysia
关键词
evoked EMG; fatigue; torque; FES contraction; spinal cord injured; OUTPUT; FORCE; POTENTIALS; FREQUENCY; RESPONSES; VOLUNTARY;
D O I
10.3390/s141222907
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
This study investigated whether the relationship between muscle torque and m-waves remained constant after short recovery periods, between repeated intervals of isometric muscle contractions induced by functional electrical stimulation (FES). Eight subjects with spinal cord injury (SCI) were recruited for the study. All subjects had their quadriceps muscles group stimulated during three sessions of isometric contractions separated by 5 min of recovery. The evoked-electromyographic (eEMG) signals, as well as the produced torque, were synchronously acquired during the contractions and during short FES bursts applied during the recovery intervals. All analysed m-wave variables changed progressively throughout the three contractions, even though the same muscle torque was generated. The peak to peak amplitude (PtpA), and the m-wave area (Area) were significantly increased, while the time between the stimulus artefact and the positive peak (PosT) were substantially reduced when the muscles became fatigued. In addition, all m-wave variables recovered faster and to a greater extent than did torque after the recovery intervals. We concluded that rapid recovery intervals between FES-evoked exercise sessions can radically interfere in the use of m-waves as a proxy for torque estimation in individuals with SCI. This needs to be further investigated, in addition to seeking a better understanding of the mechanisms of muscle fatigue and recovery.
引用
收藏
页码:22907 / 22920
页数:14
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