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AD8232: The noise of ECG waveform When using as Heart Rate Monitor on Running Machine

Question asked by PatrickMao on Jul 26, 2017
Latest reply on Aug 10, 2017 by jrombola

I design the AD8232 circuits following the datasheet (measuring heart rate by two hands). The band pass filter is 7-25Hz. When I stands statically it's OK to get a clean waveform, but there is a lot of noise when I am running, looks like the noise is from friction of hands and stainless steel electrode. Attached are the schematics except changing one 1Mohms resistor to 200Kohms (I believe it's a typo of the schematic because it determines the frequency of low-pass filer).

How can I filter the noise? Its amplitude can cover the R wave.