Measure Heartbeat of Astronaut

Excellent! Please report back when you have figured out a method for this.

They use a Holter monitor to record the heart while on space missions...If you want real time you would have to feed to the radio....

bonus blurb...

""At NASA's Manned Spacecraft Center (now renamed Johnson Space Center) we had a test subject accidentally exposed to a near vacuum (less than 1 psi) [7 kPa] in an incident involving a leaking space suit in a vacuum chamber back in '65. He remained conscious for about 14 seconds, which is about the time it takes for O₂ deprived blood to go from the lungs to the brain. The suit probably did not reach a hard vacuum, and we began repressurizing the chamber within 15 seconds. The subject regained consciousness at around 15,000 feet [4600 m] equivalent altitude. The subject later reported that he could feel and hear the air leaking out, and his last conscious memory was of the water on his tongue beginning to boil.""

http://www.nasa.gov/mission_pages/station/research/integrated_cardio.html

.

.

http://en.wikipedia.org/wiki/Effect_of_spaceflight_on_the_human_body

.

.

http://en.wikipedia.org/wiki/Holter_monitor

There's an app for that now.