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Heart Rate and Kids: How High Is Too High?

With health and fitness trackers all the rage, how do you know if your kid’s heart rate is where it should be? Pediatric cardiologists explain why traditional heart rate formulas for exercise for adults don’t work well for children, and what to look out for instead.

Physician listens to child's heart beat with stethescope during officer appointment.
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What Is Citrulline?

Taking L-citrulline, an amino acid that helps improve blood flow, may have some health benefits. A registered dietitian discusses the latest research and how citrulline works.

Athlete pours capsules of citrulline into his hand.