Use your preferred AVR programmer to flash the resulting .hex file to your Arduino Uno R3. For how to flash the .hex file to Arduino Uno R3, check Updating the Atmega8U2 and 16U2 on an Uno or Mega2560 ...
Measure an electrocardiogram (ECG) with an Arduino Uno and an Olimex-EKG-EMG-Shield and calculate the heart rate variability afterward.
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