Maths HRM question  only read if you like figures!
Wonderob
Posts: 1,372 Member
Some members on here have said this and I was wondering if it's true as it has quite a big impact on calories consumed.
When you exercise, your HRM will give you a reading for the work you have done  let's say 700 calories for an hour cycling.
To get the true figure you need to take off the calories you would burn if you were doing nothing at all  your BMR, as that has already been accounted for so...
For me with a BMR of 1539, I burn 2.67 calories per minute just keeping alive, so any exercise I do is NOT in addition to that.
60 minutes no exercise = 160 calories
60 minutes of exercise (HRM reading) = 700 calories
So the EXTRA calories I burnt off were 540 calories
In practice then I burn 1539 a day if I did nothing at all (My BMR)
I factor in my TDEE based on NO EXERCISE (BMR x 1.2) to get calories burnt including moving about, walking upstairs, making dinner etc.
TDEE = 1847
I then do some exercise (HRM reads 700 calories so I take off my BMR figure to get 540 calories)
So in theory I burnt off:
TDEE = 1847
Exercise = 540
Total = 2387 calories
If I consumed 2387 calories then in theory I would stay the same weight
I understand all figures are always very much estimates, but I'm interested to see if the maths is correct
When you exercise, your HRM will give you a reading for the work you have done  let's say 700 calories for an hour cycling.
To get the true figure you need to take off the calories you would burn if you were doing nothing at all  your BMR, as that has already been accounted for so...
For me with a BMR of 1539, I burn 2.67 calories per minute just keeping alive, so any exercise I do is NOT in addition to that.
60 minutes no exercise = 160 calories
60 minutes of exercise (HRM reading) = 700 calories
So the EXTRA calories I burnt off were 540 calories
In practice then I burn 1539 a day if I did nothing at all (My BMR)
I factor in my TDEE based on NO EXERCISE (BMR x 1.2) to get calories burnt including moving about, walking upstairs, making dinner etc.
TDEE = 1847
I then do some exercise (HRM reads 700 calories so I take off my BMR figure to get 540 calories)
So in theory I burnt off:
TDEE = 1847
Exercise = 540
Total = 2387 calories
If I consumed 2387 calories then in theory I would stay the same weight
I understand all figures are always very much estimates, but I'm interested to see if the maths is correct
0
Replies

Bump  keen to see responses.0

Bump0

I understand all figures are always very much estimates, but I'm interested to see if the maths is correct
So your 60 minutes without exercise (just to live) 64.125
So your 60 minutes of exercise 700  64.125 = 635.8750 
I understand all figures are always very much estimates, but I'm interested to see if the maths is correct
So your 60 minutes without exercise (just to live) 64.125
So your 60 minutes of exercise 700  64.125 = 635.875
Yes you're dead right  I used a preprogrammed Excel calculation  clearly wrong, thanks
But is the theory correct? Do I need to take my BMR figures from the HRM results?0
Categories
 All Categories
 1.4M Health, Wellness and Goals
 390.7K Introduce Yourself
 43.3K Getting Started
 259.5K Health and Weight Loss
 175.5K Food and Nutrition
 47.3K Recipes
 232.2K Fitness and Exercise
 379 Sleep, Mindfulness and Overall Wellness
 6.4K Goal: Maintaining Weight
 8.5K Goal: Gaining Weight and Body Building
 152.6K Motivation and Support
 7.8K Challenges
 1.3K Debate Club
 96.3K ChitChat
 2.5K Fun and Games
 3K MyFitnessPal Information
 22 News and Announcements
 852 Feature Suggestions and Ideas
 2.2K MyFitnessPal Tech Support Questions