“This is a big advance because, up till now, it takes two to six minutes and a gas mask to accurately estimate how much energy a person is burning,” said Scott Delp, the James H. The list of components and code for making the system are both available. This new wearable system only requires two small sensors on the leg, a battery and a portable microcontroller (a small computer), and costs about $100 to make. Such setups are used to assess health and athletic performance, but they involve bulky, uncomfortable equipment and can be expensive. There are laboratory-grade systems that can accurately estimate how much energy a person burns during physical activity by measuring the rate of exchange of carbon dioxide and oxygen in breath. ![]() ![]() (Consider how a cup of coffee can increase heart rate.) The researchers hypothesized that leg motion would be more telling – and their experiments confirmed that idea. population and found that it does very well, with about one third the error of smartwatches,” said Patrick Slade, a graduate student in mechanical engineering at Stanford who is lead author of a paper about this work, published July 13 in Nature Communications.Ī crucial piece of this research was understanding a basic shortcoming of other wearable calorie counters: that they rely on wrist motion or heart rate, even though neither is especially indicative of energy expenditure. ![]() “We built a compact system that we evaluated with a diverse group of participants to represent the U.S. Whereas smartwatches and smartphones tend to be off by about 40 to 80 percent when it comes to counting calories burned during an activity, this system averages 13 percent error. Engineers from Stanford University have developed a new calorie burn measurement system that is small, inexpensive and accurate.
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