I have a question. The ‘calories burned’ measurement on various bits of fitness equipment, eg bike, treadmill, elliptical - is it accurate?
Following on from that, if one had calculated that 1800 calories were to be consumed in a day, and they did 200 calories of exercise as measured on the aforementioned equipment, would they then be able to consume 200 kcal extra to break even?
A friend was explaining this to me and I thought surely it can’t be that simple?
Would the same measurement by a fitness tracker (e.g. Apple Watch, Fitbit) be more accurate and would the same principle apply?
They are inaccurate especially so for calories burned, and vary from tracker to tracker as well. There are numerous studies out there showing that the trackers are inaccurate for this metric.
Furthermore TDEE (total daily energy expenditure) calculations of how much calories you should be aiming for depending on goal should already factor in activity level which accounts for any activity you do each day, averaged over a week.
Meaning if you calculate you need 2300 calories to maintain based on light activity, and you want to be in a deficit, usually -500 for a steady cut, this ALREADY factors in all workouts / exercise you will be doing based on your choice of activity level. So if you do a gym workout, burn 200 cals (even if you only burned 150 for example) then eat those calories back, you've just ignored the fact your TDEE calculation already factored in the calories burned doing that workout!
Shockingly enough the fitness tracker apps even use these TDEE calculations when helping you set calorie targets, making the fact they show calories burn even worse, and then being inaccurate to boot.
Personally I think this information should only be used as a trend over time comparison to calories you track and eat and weight change based on goals.
Based on my personal experience, the majority of this year I've been eating at 1.7k cals, my daily calories burned averages between 2.6k-3k, this should have equated to weight loss in the region of 2lb per week, yet I've trended around 1.1lb per week. Had I eaten those extra 800-1k+ calories my fitness tracker is telling me I'm burning over my target I'm almost certain I would have put weight on!