Lecture 3 - 1 Body Composition 445/545 Body Composition...

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Unformatted text preview: 1 Body Composition 445/545 Body Composition Methodology: Body Composition Methodology: Type I Approaches and Basic Type I Approaches and Basic Statistics Statistics Session #3 Session #3 Tuesday August 31 Tuesday August 31 st st , 2010 , 2010 Objectives c Introduction to Reference Man c Overview of the five levels of body composition analysis c Overview of body composition research methodology c Focus on Type I approaches to body composition research c Overview of basic statistical methods used in creating equations for Type I approaches Organizing Body Composition Research: The Five Level Model 70 kg Reference Man Official Definition of Reference Man Reference man is defined as being between 20-30 years of age, weighing 70 kg, is 170 cm in height, and lives in a climate with an average temperature from 10 to 20 C. He is a Caucasian and is a Western European or North American in habitat and custom. Source: International Commission on Radiological Protection. Report of the Task Group on Reference Man. [ICRP Publication] No. 23. Oxford: Pergamon Press, 1975. Adopted October 1974. Page 4. Note: 70 kilograms 154 pounds 170 centimeters 5 feet 7 inches Wang Z., et al. Am J Clin Nutr 1992:56:19-28 Five levels of analysis Components by level 2 Tissue System (IV) Information based on reference 2 (modified). Body composition on the tissue-system level (IV) for principal tissues and organs of the 70-kg Reference Man Tissue or organ Amount Percent of body weight kg % Skeletal muscle 28 40 Adipose tissue Subcutaneous 7.5 11 Visceral 5 11 Interstitial 1 1.4 Yellow marrow 1.5 2.1 Bone 5 7.1 Blood 5.5 7.9 Skin 2.6 3.7 Liver 1.8 2.6 Central nervous system 1.4 2 Gastrointestinal tract 1.2 1.7 Lung 1 1.4 3 Body Composition Models Level Body Composition Model # of components Atomic BM = H + O + N + C + Na + K + C + P + Ca + Mg + S 11 Molecular BM = FM + TBW + TBPro + Mo + Ms + CHO BM = FM + TBW + TBPro + M BM = FM + TBW + nonfat solids BM = FM + FFM 6 4 3 2 Cellular BM = cells + ECF + ECS BM + FM + BCM + ECF + ECS 3 4 Tissue BM = AT + SM+ bone + organs + other 5 Whole Body BW = head + trunk + appendages 3 General Approaches to General Approaches to Body Composition Assessment Body Composition Assessment h Direct versus Indirect Direct versus Indirect h Destructive versus non Destructive versus non-Destructive Destructive General Approaches General Approaches Direct vs. Indirect Direct vs. Indirect x Direct Approaches: Direct Approaches: tend to be destructive tend to be destructive i.e. i.e. anatomical models derived from dissection anatomical models derived from dissection studies; chemical analysis of whole tissues or studies; chemical analysis of whole tissues or biopsy specimens though there are some direct biopsy specimens though there are some direct approaches that are not destructive approaches that are not destructive x Indirect Approaches: Indirect Approaches: usually estimation of usually estimation of composition from a known property (varies with...
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Lecture 3 - 1 Body Composition 445/545 Body Composition...

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