We measured the action potential of the heart - student versus teachers. We collected EKG data while riding a stationary exercise bike and measured the:

normal heart rate at rest - 90 sec

Warm-up - 30 sec

Exercise - 120 sec

Cool Down - 30 sec

Resting - 120 sec

We encountererd various difficulties because of too many variables. Adjustments were made, and data was more accurate.