This topic is a couple of weeks old, but I don't remember anybody mentioning
the type of sensors used on the LifeCycle machines to dectect heart rate.
These sensors consist of 4 stainless steel plates (two for each hand) embedded
in the handle bars.  Each hand must be touching both of their corresponding
sensors.  The machine takes about 10 - 15 seconds from the time you touch the
sensors to determine your heart rate.

Just a curiousity.  Anybody know how these work?