Portable heart monitors were worn by study volunteers who practiced calorie restriction and others of about the same age who ate standard diets so that scientists could measure their heart rate ...

To find the best heart rate monitors, we consulted experts (including ... Best for anyone who wants a monitor that’s portable and doesn’t have to be worn on your body for an extended period of time to ...

Then they gave me a portable heart monitor to wear for a week. Apparently after four days, it stopped recording data. But the cardiologist didn’t find that out for two weeks, when the results ...