![]() It was tested with over a dozen participants of varying ages and weights and averaged 13% error, compared with 40% to 80% error from consumer wearables. Instead, his system breaks down motion into each step, then uses a machine-learning model to calculate energy expenditure. "How tired you are, if you had coffee, worked out, this time history makes it really volatile."ĭespite the wires, the tracker didn't get in the way during my workouts and is lightweight. "Your heart is just pumping blood through your body and has a bunch of different factors that affect it," he says. ![]() But heart rate isn't directly related to the energy you are expending, says Slade. Most consumer wearables use heart rate and wrist-based motion to calculate calorie burn during activity. Stanford graduate student Delaney Miller wearing the leg tracker. Naturally, I wanted to put this system to the test to see if a tracker worn on my leg could really be more accurate at estimating calories burned than one on my wrist. "We want to understand the connection between physical activity and obesity so we can develop new interventions to help people live longer, healthier and more fulfilling lives," says Steve Collins, associate professor of mechanical engineering at Stanford University, who co-authored the findings with Slade. Measuring calorie burn accurately is important for a number of reasons, but mainly because it can help people manage their weight. Definitely not as convenient as strapping on a wrist-based smartwatch or tracker, but it's the first proof of concept developed by Stanford University graduate student Patrick Slade. It uses two inertial measurement units (IMUs) plus a battery unit and microcontroller worn on the hip. That's because it measures leg motion, where most of your energy is used during lower body exercises like walking, running, climbing stairs and cycling. It's not worn on the wrist - you put it on your leg. But several studies show smartwatches and fitness trackers don't do as good of a job at calculating calorie burn during activity and can be off anywhere between 40% to 80% of your actual energy expenditure.Ī new wearable developed at Stanford University claims to be far more accurate. They can monitor your heart rate during a workout and track your sleep, and some even help manage workout recovery. With that being said for some people it does come close, but for many it does not and eating calories based on it often results in overeating (and then posts here wondering why they are not losing weight or are gaining weight too fast).Smartwatches are great tools for keeping track of your activity. If you want to calculate your burned calories, track your calorie intake and weight changes over the course of 2-3 weeks. For many, the opposite happens and it drastically overestimates. My fitness tracker for example shows on average 2,200 calories burned a day, but my TDEE is actually around 2,800 (mainly due to it not tracking heart rate very well while lifting). On top of all that, often heart rate sensors in fitness trackers themselves are not all that accurate at measuring heart rate unless you are doing steady state cardio. In a lab they also measure your breathing rate and breath composition over the course of several sessions, and even that is still an estimate. The issue is heart rate alone is not a good measure of calories burned. Is a calorie calculator based on heart rate which accounts for age, sex and weight likely to be "reasonably" accurate They are completely garbage for tracking calorie expenditure during the day based on HR but work well for tracking calorie expenditure when exercising. This resulted in gaining 5-6 lbs when I was aiming for 2-3 and if I had used their RMR it would have been 7-8 lbs. ![]() Tried the garmin for a month and eat what it said my active calories were + my BMR. My actual maintenance level is abt 2k and have been eating 2350 (I add calories when I do cardio exercises depending on how much is burned) the last 6 months on a slow bulk which has resulted in abt 2-3 lb gain a month. I have been tracking my food and weight for abt a year and know pretty accurately how a specific intake will impact my weight. It consistently wanted me to eat abt 3-400 calories above what I actually need and that was even after manually adjusting for it being way of in the way it calculates your RMR. I have worn the Fenix 3 HR from Garmin for several months and can tell you hands down that the HR monitor is a TERRIBLE way to track your energy expenditure. ![]()
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