CALORIE SMART WATCH SKIN

Considering that the devices measured heart rate accurately, he speculated that the companies’ algorithms for energy expenditure might not take heart rate into account. “We think each of the devices would use a different equation,” Ashley said. So why was the calorie-counting so inaccurate? No one besides the manufacturers can know for sure, because the algorithms they developed to measures things like energy expenditure are proprietary.

CALORIE SMART WATCH SKIN

But no study participants ended up with consistently inaccurate measurements across all activities, he said, although device error on average was higher for men, greater body mass index (BMI), darker skin tone and walking (cycling had the lowest error rate of all the types of exercise studied). “Is it possible that some people are just very hard to measure?” wondered Ashley and his collaborators, whose research was published online Wednesday in the Journal of Personalized Medicine. They then compared those findings with the numbers generated by their fitness trackers.

While the study subjects exercised, the researchers measured their heart rate with an electrocardiograph and estimated their metabolic rate and energy expenditure based on the oxygen and carbon dioxide in their breath.

Calorie smart watch