Zone 2, 3, 4? What do heart rate zones mean for your health?

Runners, cyclists and gym-goers with wearable fitness trackers are no doubt familiar with the five "heart rate" zones. Ranging from low to very high intensity, these zones are calculated as percentages of a person's maximum ...

New MRI system could aid early detection of heart failure

The heart's ability to use oxygen efficiently is a critical indicator of its health, but tests to measure this function have drawbacks that can limit their use. A new Cedars-Sinai Health Sciences University study found that ...

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