How large should the analog to digital conversion rate be for a reference device to study the accuracy of heart rate monitors?

According to the biosignal wireless support, research grade devices should have at least 16 bit analog to digital conversion rate. Does it make sense for a sound card ECG device to choose a sound card with for instance 24 bit instead of16 bit? No, according to wibble from the Pine64 forum. He wrote there, he …