Mechanomyography sensors for detection of muscle activities and fatigue during Fes-evoked contraction

The experiment is to investigate the reliability of two different mechanomyogram (MMG) sensors recording during functional electrical stimulation (FES)-evoked contraction. The MMG based sensors used in this study are vibromyography (VMG) and muscle contraction (MC) sensor. One spinal cord injured (SCI) patient was requested to perform knee extension movements during two sessions of isotonic exercise for strength and fatigue tests. Data from each sensor was collected, processed and analysed in personal computer. Processed data of sensors were correlated with the measured output torque to identify the linearity of sensors signal with output. Analyzed data from both MMG based sensors are tabulated and compared. The sensor with coefficient of correlation nearest to 1 is considered more reliable in muscle activity and fatigue detection. From the findings, it can be concluded that MC sensor is better in detecting and measuring muscle activities for SCI subjects. While for detecting and measuring muscle fatigue VMG performs better for SCI subjects.