Dear All,
I was using a surface EMG system that showed the EMG trace on the screen. The system I use has a peak detection of 400uV and the signals I was getting were about 5-10uV. The client's relative received a call on their mobile phone during the assessment and this severely interfered with the EMG signal. I had used skin preparation, good electrodes, good signal to noise ratio reduction in the pre-amplifier, fibre optic link to the PC and the phone was about 2 meters away. This would render the system useless during a mobile phone call.
I have tested this again at work and get interference during a call at about 1 metre (presumably different signal strengths). Has anybody else observed this phenomenon or does anybody have advise about this. Obviously I will ask people not to have mobile phones on when within the same room as the EMG equipment.
Thanks,
Neil Gregory
Clinical Engineer
Access to Communication and Technology
West Midlands Rehabilitation Centre, England
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Tel. UK +44 (0)121-627 8235
Fax. UK +44 (0)121-627 8892
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