Basal and Total Metabolic Rate - Harris Benedict Equations
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- Опубликовано: 13 сен 2024
- This video shows Dr. Evan Matthews providing an overview of how to calculate basal energy expenditure (similar to resting energy expenditure) and total energy expenditure estimates. Resting energy expenditure is calculated using the Harris Benedict equations in this video. Examples are shown for a man and a woman.
Physical Activity Factors
Sedentary (1.2) - desk job and little to no exercise
Light Activity (1.375) - light exercise/sports 1-3 days/week
Moderate Activity (1.55) - moderate exercise/sports 3-5 days/week
Very Active (1.725) - hard exercise/sports 6-7 days/week
Exceedingly Active (1.9) - hard daily exercise/sports and physical job or training
I have not found an original authoritative source for these standard activity factors for apparently healthy adults, but this is the source of the information above.
Kelly MP. Resting Metabolic Rate: Best Ways to Measure It-And Raise It, Too. ACE. 2012 Oct. www.acefitness...
Additional textbook sources of these activity factors:
Source 1: Lutz C, Mazur E, Litch N. Nutrition and Diet Therapy. 6th ed. Philadelphia (PA): F.A. Davis; 2015. pg 523.
Source 2: American College of Sports Medicine. ACSM’s Resources for the Exercise Physiologist 3rd ed. (2022). Table 7.10
Source 2 cites source 1. Source 1 does not provide a citation. It appears as though these are research validated. Despite that they are commonly used and recommended by major organizations like the American College of Sports Medicine. Another source of activity factors that are lower than those in this video can be found at: www.cdc.gov/pc...
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Harris - Benedict Equation Partial Book (First publication) Citation:
www.ncbi.nlm.n...
Harris - Benedict Equation Full Book Citation:
archive.org/de...
Or
books.google.c...
Mifflin - St. Jeor Equation Citation:
pubmed.ncbi.nl...
Citations saying the Mifflin - St. Jeor Equation has less error (within 10% of measured) than the Harris - Benedict Equation and other similar equations. This is regardless of weight status.
pubmed.ncbi.nl...
Center for Disease Control Webpage for An Easy Approach to Calculating Estimated Energy Requirements www.cdc.gov/pcd...
Link to Dr. Evan Matthews website.
sites.google.c...
Very helpful. Thank you.
You are welcome.
So resistence training is not a factor for physical activity ?
I mean I do lift wheights 6 times a week but walking for arrands only
so what would you recommend me to multiply for maintencne?
Hi bla bla. Keep in mind these are just estimates, but I would imagine you would fall under moderate activity (x1.55) or very active (x1.725), but I cannot say for certain based on the information you gave.
Great video! Does anybody know where the set numbers in the equation actually come from? (66.4730)
Thank you. Check the video description for sources.
I’m seeing fitness vids saying the equation is 10 * weight kg + 6.25 * height cm - 5 * age + 5 for men. Is this the new equation? I’m about -100 bmr using the new one compared to the 1919 equation
Check this out. ruclips.net/video/XY560omJd0U/видео.html
Why not using miffin calculation if is more accurate?
The Harris benedict equation is older and well established. So some people use it by default.
how do you know the numbers of physical activity?
I have not found an original resource yet. Each resource I have found does not provide a citation. Each has slightly different descriptions for the activity categories as well.
I mean you said no one knows, there is a calculation on CDC website based of METs, but the numbers are different, of course It would be very helpful to know the rational beyond these numbers
I am sure someone knows the original resource for these values. I just haven't found it. I have been using these for several years and don't remember where I originally found them, but as an example here is one of several websites listing these factors (www.livestrong.com/article/526442-the-activity-factor-for-calculating-calories-burned/). If you know the original source please put a link in a comment. I would be very appreciative. Thank you.
I did a bit more digging and still have not found the original source of these activity factors. I also read through a few papers and the closest thing I can find is
"To accomplish this aim, basal energy requirements, or resting energy expenditure (REE), often are estimated using prediction formulas such as the Harris-Benedict (HB) formula [1]. This prediction formula takes into account sex, body weight, height, and age. The calculated REE must then be modified by an activity factor to predict total, free-living energy requirements. Activity factor adjustments for healthy adults often range from 1.2 (sedentary lifestyle) to 1.5 (moderately active) and are even further increased for very active subjects."
Citation: doi.org/10.1016/j.nutres.2007.01.016
Notice they don't provide any citations either. I reached out to a couple research active nutrition professors I know from two different universities. We'll see if they have any information on the topic. If I find something I'll be sure to add it to the description of the video and to this comment thread. Please do the same.
@@VivoPhys Of course Andrew, I'm researching this to understand the reason behind it, It is important to know because the accuracy is relevant. The only activity factor I found with the calculation is the CDC formula, which is explained in the article "www.cdc.gov/pcd/issues/2006/oct/06_0034.htm"
But I will add to this thread any information I find