Journal of King Abdulaziz University Engineering Sciences, vol.10, pp.135-141, 1999 (Peer-Reviewed Journal)
Muscles generate an electrical signal called the electromyogram (EMG). An electronic system is developed to detect and analyze the EMG to find out a reliable indicator of the muscular activity and understand physiological status of different muscles. A special amplifier detects and amplifies the signal. A signal processor is designed to generate output voltages related to the root mean square (RMS) value and median frequency of the signal. The RMS value is used as an indicator of the signal power.The median frequency yields an early indication of the localized muscular fatigue. A novel filtering approach is utilized to obtain ripple free output voltages. The outputs are available at real time. Hence, cahnges at the level of activity and condition of the muscle can be monitored continuously. The signal is available for further processing by digital computers.