<span>Heart Rate Reserve, HRR. Heart rate reserve (HRR) is the difference between resting heart rate (HR<span>rest) and maximum heart rate</span> (HRmax). Heart rate reserve is used when determining exercise heart rates. The Karvonen formula is used to calculate exercise heart rate at a given percentage training intensity.</span>
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Excessive chest hair. If the victim has a hairy chest you will need to remove the hair prior to placing the AED pads on the victim's chest.
Medication Patches.
Water and/or sweat.
Pacemakers or Defibrillators.
Fully Automated AED.
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