Fundamentals of Human Nutrition/Body composition
13.2 Body Composition
Please use this HELP:EDITING link for information about contributing and editing the book.
Body Composition Makeup and Measuring
The Center for Medical Weight Loss which is located at http://www.centerformedicalweightloss.com/health-and-fitness/general-health/your-body-weight-vs-body-composition-whats-the-difference/ , offers a comparison between body weight and body composition. Body weight includes fat, lean body mass, and water. Lean body mass includes muscle, organs, and bone. A standard bathroom scale measures body weight. Body composition refers to the distribution of both muscle and fat in the body. This is often represented as a two part system which includes both lean body and fat weight. (http://www.topendsports.com/testing/bodycomposition-about.htm) A body composition scale provides the user with not only their weight but also the percentage of fat their body contains.
TopEndSports found at http://www.topendsports.com/index.htm offers information on sports and nutrition. On this website, there is a section on measuring body composition which includes a list of tests which can be used to measure the levels of composition components in the body. (http://www.topendsports.com/testing/bodycomp.htm )
Body Composition Tests
Measurement Skinfold measurement, Girth measurements, Body Weight, Hydrostatic Weighing, Bioelectric Impedance, Dual-Energy X-Ray Absorptiometry (DEXA, Near Infrared Interactance, Total Body Potassium (TBK) , Whole-body Air-Displacement Plethysmography (BodPod), Magnetic Resonance Imaging (MRI), Total Body Electrical Conductivity (TOBEC), Computed Tomography (CT), Total Body Protein (TBP)
Calculations Body Mass Index (BMI), Waist to Hip Ratio, Ponderal Index, Broca Index, Devine Formula, Muscle Mass Calculation, Calculating %bodyfat using skinfolds, Calculating %bodyfat using girths, Somatotype, Weight for Height Tables
Ratings for % Body Fat Levels
The table below represents the ratings for % of body fat levels and can be found at http://www.topendsports.com/testing/bodyfat-norms.htm. It is important to note that the amounts listed here are not only for athletes but also the general population.
There is more than one site that offers information on the types of body composition testing out there. At http://www2.gsu.edu/~wwwfit/bodycomp.html there is a list of body composition testing methods that includes description, accuracy, attire someone should wear for testing, advantages, disadvantages, and even the averagecosts associated with the testing.
On http://www.medicinenet.com/script/main/art.asp?articlekey=56830 , the article written by Jeanie Lerche Davis starts by discussing the old methods such as using measuring tapes and the BMI method. It then goes on to grade the newer methods on a scale from A to F on whether or not the tests do anything to help a person understand body composition; ease and accuracy of methods; and cost.
1. Davis. Bathroom Scales Don’t Tell the Whole Truth. Medicinenet.Com. Retrieved from http://www.medicinenet.com/script/main/art.asp?articlekey=56830.
2. Doyle (1998). Body Composition. The Exercise and Physical Fitness Page. Retrieved from http://www2.gsu.edu/~wwwfit/bodycomp.html.
3. Fitness Testing: About Body Composition Measuring. Topendsports. Retrieved from http://www.topendsports.com/testing/bodycomposition-about.htm.
4. Fitness Testing: Body Composition Testing. Topendsports. Retrieved from http://www.topendsports.com/testing/bodycomp.htm.
5. Fitness Testing: % Body Fat Norms. Topendsports. Retrieved from http://www.topendsports.com/testing/bodyfat-norms.htm.
6. Topend Sports: The Ultimate Sport and Science Resource. Topendsports. Retrieved from http://www.topendsports.com/index.htm.
7. Your Body Weight vs. Body Composition: What’s the Difference?. The Center for Medical Weight Loss. Retrieved from http://www.centerformedicalweightloss.com/health-and-fitness/general- health/your-body-weight-vs-body-composition-whats-the-difference/.