Recording the clearest possible signal can prove tricky, especially from exercising or mobile subjects. We have compiled a helpful guide on electrode placement and preparation that ensures accurate and precise data from mobile subject recording.
When recording mobile subjects, it’s important to take note of the length of lead wires and choose the shortest available option. Longer lead wires have the potential for more motion which could result in moving the electrode on the skin. If there is slack on the wire use tape and wrap to secure the wire closer to the subject’s body.
With multiple options for electrodes it’s important to consider the type of electrode would best facilitate the research. Electrodes can be designed to cover awkward shaped regions of the body or experiments extending beyond 24 hours, but for mobile subjects it’s recommended to use high stress electrodes which utilize a stronger adhesive.
Placement of the electrode is crucial. With ECG acquisition its best to put electrodes across the chest, but placement can vary depending on the research. It’s recommended to place the electrode where there’s the least amount of possible obstructive artifacts; for example, the electrode may need to be adjusted higher on the chest if subjects are using their stomach muscles. When collecting ECG placing an electrode above the bone is better than over a muscle.
The overall setup of the electrodes is very important. Using fresh gel and electrodes as well as taking time to abrade the surface of the skin allows for clearer signal acquisition. Electrodes should sit on the participant’s skin 10-15 minutes and it’s recommended to use an impedance level checker to diagnose the signal before recording.
BIOPAC’s MP160 research system with BioNomadix wireless amplifiers and logger provide the best options for data acquisition of mobile subjects. The transmitter-receiver pair and logger allow for wireless connection between the subject and MP device. BioNomadix is applicable to a wide range of physiological signals including: ECG, EEG, EMG, EOG, EGG, EDA, pulse, respiration, temperature, acceleration, goniometer, heel-toe strike, and clench force.
BIOPAC offers a variety of equipment that can be used in mobile recording studies. To find more information on solutions for recording and analyzing signals such as skin conductance, ECG, heart rate, respiration, and EMG using the MP160, and other platforms, you can visit the individual application pages on the BIOPAC website.