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 ...

Study maps hidden immune signals in type 1 diabetes

Type 1 diabetes researchers have made great progress in understanding the disease in the last two decades, even as a cure remains elusive. Now they have something that benefits any scientific effort. It's a map.

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