Cardiac workload

Cardiac workload, also known as myocardial workload, measures how much stress is put on the heart muscle. The formula we use to calculate cardiac workload is:
Systolic Blood Pressure * Heart Rate / 60

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A lower heart rate and systolic blood pressure reduce the overall stress on the heart, while higher values indicate increased cardiac demand. The normal range for cardiac workload is 90–216 mmHg/s, derived from standard reference values for heart rate and systolic blood pressure.

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Taking a cardiac workload measurement at rest can be indicative of cardiovascular health. A person who is regularly active, for example, will typically have a lower cardiac workload versus someone who is sedentary. Cardiac workload can also increase transiently during exercise; however, it should decrease after stopping physical activity.
Thus, we can use cardiac workload to monitor the health of the cardiovascular system but also to help us tailor fitness training and monitor recovery.