Power meters measure the work you’re performing and display it in kilojoules, which is a unit of work that takes into account that the human body isn’t 100-percent efficient when turning energy from your fuel stores into physical work, like pedaling a bike. Ultimately, however, the best way to know how many biking calories you’re burning as you rip down the road is by using a power meter. Wearing a chest-based heart rate monitor that is synced to your device also helps make your calorie count more accurate. The more detailed data you input about yourself, such as age, height, weight, gender, and max heart rate, the more accurately their internal algorithms can calculate your calorie burn. GarminConnect, Strava, and other training apps might be a bit better, but they’re not perfect, either, and the number they give you depends heavily on the information you give the app. Euan Ashley, professor of cardiovascular medicine, genetics and biomedical data science, told the Stanford Medical News Center, “Basing the number of doughnuts you eat on how many calories the device says you’ve burned is a really bad idea.” The least accurate one? Off by 93 percent. The most accurate one, the Apple Watch, was off by 27 percent. Still, that said, we know that it’s easy and often enjoyable to grab a chocolate scone and a large latte during your weekly coffee ride, which could result in your weight trending in a direction opposite of what you’re aiming for.īut everything is better now that we have electronic wearables tracking our every step and ride, right? Not exactly.Ī Stanford study published in 2017 reported that not one of the seven devices they tested-including the Apple Watch, Fitbit Surge, Mio Alpha 2, Basis Peak, Microsoft Band, PulseOn, and the Samsung Gear S2-delivered an accurate number for calories burned. And thinking about food as a “reward” for activity can (for some) lead to an unhealthy relationship with food and exercise. Now, we don’t believe in food as a reward for cycling we eat to fuel our rides. So you’re not burning an additional 540 calories the additional calories are less. (File that under “life’s not fair.”) That figure also never takes into account the fact that you’d be expending 1 MET and burning 68 calories that hour even if you were doing nothing more strenuous than watching TV. That’s because the fitter you are, the more efficient you are, and the less energy/fewer calories you use when you ride at a given pace. Play icon The triangle icon that indicates to play
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