I see the same activity factor (multipliers) in research papers and websites, but I cannot find where they come from. Does anyone know where these originated? I am looking for an original citation, or at least a reputable citation like an ACSM textbook.
Sedentary (little or no exercise) : Calorie-Calculation = BMR x 1.2
Lightly active (light exercise/sports 1-3 days/week) : Calorie-Calculation = BMR x 1.375
Moderately active (moderate exercise/sports 3-5 days/week) : Calorie-Calculation = BMR x 1.55
Very active (hard exercise/sports 6-7 days a week) : Calorie-Calculation = BMR x 1.725
Extra active (very hard exercise/sports & physical job or 2x training) : Calorie-Calculation = BMR x 1.9
Harris JA, Benedict FG. A biometric study of human basal metabolism. Proc Natl Acad Sci USA 1918;4(12):370-3.
Article A Biometric Study of Human Basal Metabolism in Man
https://globalrph.com/medcalcs/harris-benedict-basal-metabolic-rate-calorie-calc/
Thank you for your reply!
I have tried to find the information in that publication, but have not been able to locate it. The Harris - Benedict equations are in that source, but I cannot find the activity factors in it. Do you happen to know which page it is, or if this is not the correct source for the activity factors do you know what is? Below are links to the Harris - Benedict papers.
Harris – Benedict Equation Partial Book (First publication) Citation:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1091498/
Harris – Benedict Equation Full Book Citation:
https://archive.org/details/biometricstudyof00harruoft/page/12/mode/2up
Or
https://books.google.com/books?id=Vs0EAAAAYAAJ&ots=3tT94JAuP8&dq=Harris%20JA%20Benedict%20FG%20A%20biometric%20study%20of%20basal%20metabolism%20in%20man%201919%20Carnegie%20Institution%20Washington%20DC%20&lr&pg=PA1#v=onepage&q&f=false
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