Body composition assessment methods - underwater weighing, Biology

Assignment Help:

Define Body Composition Assessment Methods - Underwater Weighing?

Underwater weighing or hydrostatic weighing is one of the most common body composition methods used in laboratory settings. It is based on densitometry i. e, the measurement of total body density (Db) and the estimation of body composition from Db. Db is the ratio of body mass to body volume (BV); BV is measured by either water displacement or air displacement. The water displacement method, known as hydro densitometry or hydrostatic weighing, has been considered as a gold standard method because it gives a relatively small technical error in the measurement of body density.

To measure body density, a pool and measuring equipment is needed. The subject is weighed in air, and then immersed in water. The difference in the upthrust displacement by water is measured. Thus, the values of total body mass; underwater weight, water temperature and residual lung volume (RV) are measured.

This method is based on Archimedes's principle which states that a submerged object is buoyed up by a force equal to the volume of the water it displaces.  This buoyant force causes the object to weigh less underwater than it does on land.  Me difference between land weight and underwater weight is used to calculate body volume and subsequently body density. Once the body density is measured, this value must be converted into body fat percentage using Siri. Equation (discussed above with 2-C model). Hydrostatic weighing or underwater weighing requires considerable subject cooperation given that multiple trials need to be performed in order to obtain an accurate estimate of underwater weight. Let us get to know about these requirements.


Related Discussions:- Body composition assessment methods - underwater weighing

Tissue distribution and regulation of calcium concentration, Define Tissue ...

Define Tissue Distribution and Regulation of Calcium Concentration? As already discussed, development and preservation of bone mass is quantitatively an important function of c

Promotion - stages of carcinogenesis, Promotion - Stages of carcinogenesis ...

Promotion - Stages of carcinogenesis The second stage or promotion is reversible and does not include changes in structure of DNA but rather in the expression of the genome of

Explain the term of measurement of height in veous pressure, Explain the te...

Explain the term of measurement of height in veous pressure? Measurement of Height: Measurement of height of venous pressure is done from the sternal angle of Louis verticall

Does mitosis properly occur before or after the interphase, Does mitosis pr...

Does mitosis properly occur before or after the interphase? Is it a mere "point of view" issue? Mitosis must be considered a succeeding phase after interphase since this

Prevention and control from escherichia coli, Q. Prevention and Control fro...

Q. Prevention and Control from escherichia coli? Prevention and Control: Involves avoiding contaminated food and water that have high coliform counts, avoiding unpasteurized ju

Gram positive & gram negative bacteria , What is the difference among Gram ...

What is the difference among Gram positive & Gram negative bacteria based on cell content? Ans) The cell membrane is made if more of lipoproteins in gram negative compared to gr

Define the food and nutrition security, Define the Food and Nutrition Secur...

Define the Food and Nutrition Security? In the previous section, we learnt about the trends in production of food grains in the country and their relationship to population gro

What is the phellogen? what its function, What is the phellogen? What its f...

What is the phellogen? What its function? The Phellogen also called as cork cambium is the meristematic plant tissue responsible for the formation of the periderm (the covering

Reproduction, site of fertilistion in human

site of fertilistion in human

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd