I have tried the search link but my browser says it cannot open the site - broken link (???).
Anyway, I'm looking for a circuit which uses the potential between the hands to measure heart pulse rate such as are used on treadmills. I expect this would use op amps to give high gain with noise reduction techniques and possibly high impedance (resistance) connections to the hands.
Actually, I know there is a standard IC called ST158 can speed up your prototyping work. For more details, please visit the website at http://www.spark-hk.com