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Calories cycling on stationary bike?

Old 08-12-21, 10:36 AM
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Aderasmo23
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Calories cycling on stationary bike?

Ok so iím very confused. Today I did a small 25 minute session on the stationary bike at the gym. I averaged 6.5 miles in that time and my average speed according to the machine was 15.6 mph at a medium resistance. I looked at the watts after and it said 90? How is that possible and how many calories do you think I actually burned? Iím 5í8, 135 pounds and a female. I was definitely sweating and the machine only had me at burning 110 calories in that time period.
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Old 08-12-21, 11:09 AM
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First, how many "miles" on a stationary isn't relevant. Nor is "speed." You're stationary, so distance is zero and speed is zero. Second, your height, weight, and gender are also irrelevant. All that matters is how much work you do.

Assume the power meter in the stationary is accurate (huge assumption, since they tend to be pretty unreliable), but let's go with it: 90 watts for 25 minutes = 2250 watt minutes = 135 kj of energy.

It's in the ballpark.
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Old 08-12-21, 11:17 AM
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There's a dedicated indoor/stationary subforum in the Road Cycling forum.
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Old 08-12-21, 12:26 PM
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Calories

This article might explain.

0.4 Hour x 90w x 3.6 = 135 Calories
A lot less than you hoped !

Barry

Last edited by Barry2; 08-12-21 at 12:31 PM.
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Old 08-12-21, 04:22 PM
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Originally Posted by Barry2 View Post
This article might explain.

0.4 Hour x 90w x 3.6 = 135 Calories
A lot less than you hoped !

Barry

Well... It's around 17 Haribo Starmix pieces!

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Old 08-12-21, 08:08 PM
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More proof that you can never out-exercise a bad diet!
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Old 08-13-21, 07:01 AM
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Originally Posted by LifeNovice1 View Post
More proof that you can never out-exercise a bad diet!
If only more people understood exactly how much exercise you need to do to burn off a couple hundred calories. I think most people tend to underestimate the number of calories they eat and overestimate the number of calories they burn. You're not going to burn off half a bag of Doritos by walking around the block.
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Old 08-13-21, 07:36 AM
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Originally Posted by Milton Keynes View Post
If only more people understood exactly how much exercise you need to do to burn off a couple hundred calories. I think most people tend to underestimate the number of calories they eat and overestimate the number of calories they burn. You're not going to burn off half a bag of Doritos by walking around the block.
True, but can also be surprisingly high. I managed to burn 859 cals in an hour on the bike last night. That's a good sized meal right there!
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Old 08-13-21, 08:45 AM
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Originally Posted by Milton Keynes View Post
If only more people understood exactly how much exercise you need to do to burn off a couple hundred calories. I think most people tend to underestimate the number of calories they eat and overestimate the number of calories they burn. You're not going to burn off half a bag of Doritos by walking around the block.
I religiously track everything i eat and any exercise(dedicated, not counting random steps i take in my home thru the day) and have done so for almost 2 years. I have done this twice in the past and it worked great each time, but I eventually stopped because I thought I could guesstimate and be good. Clearly I cant.

I have no idea how accurate everything I enter is, but the results are clear, so as long as everything entered is consistent(consistently accurate or consistently inaccurate), it doesnt much matter.
I enter all cycling related activities at 1 'level' below what I did. So if I rode 125min at 16.8mph, I will enter 125min at 12-14mph into the app, just to sorta be on the safe side. I do that because I think it overstates calories burned from cycling, even though I have absolutely no evidence of that being the case.

Anyways, not much point to this. I decided to post because though I agree with your Doritos comment, my block is exactly 1 mile around and based on the fitness and nutrition app I use, I can burn off half a bag of Doritos! Obviously the block size is an outlier.
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Old 08-13-21, 08:49 AM
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Just donít rely on ANY application using only heart rate to estimate calories.
Any chance at a reasonable calorie number really needs an actual power meter.

My wrist worn health trackerís estimates are laughable.

Barry
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Old 08-13-21, 10:29 AM
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Originally Posted by Barry2 View Post
Just donít rely on ANY application using only heart rate to estimate calories.
Any chance at a reasonable calorie number really needs an actual power meter.

My wrist worn health trackerís estimates are laughable.

Barry
How far off from 'real' are they? I assume you have a power meter that has been shown to be accurately calibrated so you then know your wrist tracker is way off.
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Old 08-13-21, 10:53 AM
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Sorry I don't recall actual numbers for the difference and haven't compared recently. When I switched to a power meter two years ago I noticed the jump.

As for your calibration comment, I did a three way comparison for my cycling coach who questioned accuracy.
Garmin Vector 3 dual
Stages Gen3 Dual
Wahoo Kickr Bike

Vector 3 measured 3% high across the board compared to the other two.
So... All 3 were close and to *G.E. standards.

Barry



* G.E. - - Good Enough
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Old 08-13-21, 11:08 AM
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This is interesting. I've lost 35 pounds since January using my Fitbit and app. I was very careful to measure what I ate at dinner time. Going as far as to measure sauce, etc with measuring cup and tablespoons. I found that keeping the old 250-500 calorie deficit worked. Probably wouldn't have worked if the Fitbit estimates were THAT optimistic. I found what the earlier poster said was true. I really understimate my calorie intake. Also I quit drinking which helps in too.
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Old 08-14-21, 09:11 PM
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Originally Posted by Aderasmo23 View Post
Ok so iím very confused. Today I did a small 25 minute session on the stationary bike at the gym. I averaged 6.5 miles in that time and my average speed according to the machine was 15.6 mph at a medium resistance. I looked at the watts after and it said 90? How is that possible and how many calories do you think I actually burned? Iím 5í8, 135 pounds and a female. I was definitely sweating and the machine only had me at burning 110 calories in that time period.
Doing the hard math, thatís 4.4 calories/minute. Seems like a fair amount. Indoor Sweat is not a great indicator of effort but it sure makes me feel like Iíve worked hard. Make sure you get a good fan, preferably a big box fan if you donít have one or you will burn calories keeping yourself cool rather than in your workout.
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Old 08-14-21, 10:34 PM
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Originally Posted by Milton Keynes View Post
If only more people understood exactly how much exercise you need to do to burn off a couple hundred calories. I think most people tend to underestimate the number of calories they eat and overestimate the number of calories they burn. You're not going to burn off half a bag of Doritos by walking around the block.
I ride to support my crappy diet....
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Old 08-15-21, 10:00 AM
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Beer is good but good beer also has serious calories. Like 500 for just a couple brews on a Friday night.

Twice a week, thatís 1000.

Lotta work on bike to take care of that!

If I could plot that on a chart the weight correlation is dead on.
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Old 08-15-21, 11:01 PM
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Originally Posted by caloso View Post
First, how many "miles" on a stationary isn't relevant. Nor is "speed." You're stationary, so distance is zero and speed is zero. Second, your height, weight, and gender are also irrelevant. All that matters is how much work you do.
Assume the power meter in the stationary is accurate (huge assumption, since they tend to be pretty unreliable), but let's go with it: 90 watts for 25 minutes = 2250 watt minutes = 135 kj of energy.
It's in the ballpark.
sadly, this...
sweating on a stationary bike is so unrewarding !
about the same as a brisk 2 mile walk.
but, yeah, so many misjudge how much 'work' they've actually accomplished in any exercise/activity...
...but you likely did get some cardio work... and that's a good thing!
Thx
Yuri
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