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 ...

How shift workers' internal clock affects their health

Health care workers who take on extended or overnight shifts, particularly during periods of operational strain, may face heightened fatigue that can affect their own well-being. This fatigue arises not from individual effort ...

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