Changes

Maximum heart rate (HR_max) is the fastest rate the heart is capable of beating. Like any [[Muscle|muscle ]] there is a limit to how fast the heart can contract, and this limits how fast the heart can beat. This maximum heart rate is not a "safe limit", but a physiological limit. It is not possible to exercise and push your heart rate beyond its maximum; if you see your heart rate go higher than the previously recorded maximum all you're doing is redefining what the maximum value is. However, with prolonged exercise (>10 min) [[Heart Rate Drift]] will gradually increase the Maximum Heart Rate<ref name="Wingo-2005"/>.