2) Inter-day changes
The diagrams below offer examples of actual measurements made of
THE APPLICABILITY OF THE BMR REGRESSION FORMULA AND ITS DIFFERENCES WITH THE OLD FORMULA
The New Regression Formula for Basal Metabolic Rate (BMR)
Intra-day fluctuations (Weight)
61 |
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60.5 |
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60 |
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kg59.5 |
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58.5 |
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10：00 | 12：00 | 14：00 | 16：00 | 18：00 |
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＋5/13（Monday） | ◆5/14（Tuesday） | ▲5/15（Wednesday） ×5/16（Thursday） | ||
Intra-day fluctuations (Impedance value)
420 |
410 |
400 |
390 |
380 |
No significant
As mentioned earlier, impedance increases when body weight is reduced (such as by dehydration), and decreases when body weight is increased through excess consumption of food and drink. The
It has long been said among medical and nutritional specialists that "The Basal Metabolic Rate (BMR) is more determined by the Fat Free Mass (FFM) than by the body weight" (Persons of a given body weight with a higher FFM will have a higher BMR), and that from the aspect of evaluating the body composition, should be estimated from the FFM. In addition, in cases of simple estimation formulae which can calculate from the height, weight and age, without evaluating the body composition, there was a problem with excessively high evaluations being given to obese persons with large body weight, and conversely excessively small BMR evaluations given to muscular athletes, though these are not as many in number. Currently, the BMR estimation recursion formula developed by Tanita, the manufacturer of body composition analyzers, based on their research, works by multiple regressive analysis using this FFM, and has a higher degree of accuracy in the individual differences in body composition. In order to derive the BMR, resting respiratory metabolism (Resting Energy Expenditure: REE) was measured using a breath gas analysis device, and this estimation recursion formula was created based on this data.
<Figure 1> The Relationship Between Resting Energy Expenditure (REE) According
to Breath Gas Analysis and Weight, FFM
(Presented at Nutrition Week, Held in San Diego in 2002)
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340 |
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＋5/13（Monday） | ◆5/14（Tuesday） | ▲5/15（Wednesday） ×5/16（Thursday） | |||||||||||||||||||||
Intra-day fluctuations (
%FAT)
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％ 19 |
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10：00 | 12：00 | 14：00 | 16：00 | 18：00 |
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＋5/13（Monday） | ◆5/14（Tuesday） | ▲5/15（Wednesday） ×5/16（Thursday） | ||
These
1)Temporary increases in body weight (total body water) through overeating and overdrinking
2)Dehydration due to heavy sweating during vigorous exercise
3)Dehydration due to alcohol consumption or the use of diuretics
4)Dehydration due to heavy sweating during saunas, etc. Accordingly, it is recommended that instructions be provided to the subject to help eliminate these causes when accurate measurements are needed.
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| FFM vs REE |
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| 3000 |
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breath | 2500 |
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| Male |
2000 |
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| Female | |
from |
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kcal/day | 1500 |
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REE(→BMR) | 1000 |
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500 |
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| 0 |
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| 10 | 30 | 50 | 70 | 90 |
FFM kg
Weight vs REE
3000
breath | 2500 |
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| Male | |
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from | 2000 |
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kcal/day | 1500 | Female |
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REE(→BMR) | 1000 |
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500 |
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30 50 70 90 110 130
Weght kg
JP Male 
JP Female 
US Male 
US Female
JP Male 
JP Female 
US Male 
US Female
40 | 41 |