Evaluation of Dry Electrodes in Canine Heart Rate Monitoring

Figure 1. Electrodes: (a) The spring-loaded j75-1 test pins; (b) The Ag/AgCl-coated polymer electrode; (c) The electrode with gold-plated spring-loaded test pins.

Figure 2. The electrodes embedded into housings: (a) Peak electrode with PLA plate; (b) Ag/AgCl-coated polymer electrode before the second casting; (c) Gold electrode before the second casting; (d) Peak electrode in the neoprene fixture; (e) Ag/AgCl coated polymer electrode in the silicone rubber fixture; (f) Gold electrode in the silicone rubber fixture.

Figure 3. (a) Mold for the silicone rubber housing casting; (b) Cast silicone rubber electrode housing.

Figure 4. (a) The second version of the neoprene harness placed on the dog; (b) Polymer and gold electrodes attached to the neoprene harness.

Figure 5. Illustration of the measured and filtered ECG data. Red rectangles denote the parts of the original signal that will be depicted in detail in Figure 6.

Figure 6. Zoomed-in raw and filtered ECG data. The data comes from the original signals presented in Figure 5 that are marked by red rectangles.

Figure 7. A typical scaled EGC template pattern that was used in pattern matching.

Figure 8. Raw pattern match data and its respective RR interval graph. Red rectangles denote the parts of the original signal that will be depicted in detail in Figure 9.

Figure 9. A zoomed-in representation of the scaled vector distance from the template pattern and the respective zoomed-in RR interval graph.

Figure 10. Combined heart rate coverage boxplots with observation points which represent a coverage ratio computed from a 60 s measurement case. The observations are marked with stars while the outliers are marked with red circles.

Figure 11. Boxplots of coverage ratios in different configurations with the respective observation points included in the plots. The observations are marked with stars while the outliers are marked with red circles.