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Fitness trackers flop for counting calories burned

from MedPage Today

Most wrist-worn fitness trackers accurately measured heart rate but were terrible at estimating energy expenditure, according to a small study of laboratory-based activities. Six out of seven fitness tracker devices had a median heart rate error across participants and fitness activities of less than 5 percent compared with the gold standard measurement obtained from a 12-lead ECG, reported Euan Ashley, DPhil, of Stanford University in Stanford, Calif., and colleagues. more

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