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

Class of crustacea - branchiopoda, Class of Crustacea - Branchiopoda ...

Class of Crustacea - Branchiopoda These are small fresh water crustaceans. The trunk appendages are flattened and leaf like and are helpful for locomotion also respiration he

Effect of alcoholic beverage, Q. Why does the urinary volume increase when ...

Q. Why does the urinary volume increase when alcoholic beverages are ingested? Alcohol inhibits the ADH (antidiuretic hormone) secretion by the hypophysis and Low ADH reduces t

What is salmonella typhosn, What is salmonella typhosn Typhoid is  an e...

What is salmonella typhosn Typhoid is  an enteric fever, which relates  to acute infection of  short duration. It is   caused by bacteria called Salmonella typhosn about which

Explain the function of the umbilical cord, Q. What is the function of the ...

Q. What is the function of the umbilical cord? The umbilical cord is a set of blood vessels that connects the fetus with the placenta and in the fetus one extremity of the cord

Components of ecosystem, An ecosystem consists of two types of components: ...

An ecosystem consists of two types of components: (a)   Abiotic components: This includes the non-living components of the ecosystem. These are physical and chemical fact

Explain clear liquid diet, Explain Clear Liquid Diet Clear Liquid Die...

Explain Clear Liquid Diet Clear Liquid Diet:  It is composed  of  foods with  low residue content which  help  to minimize  the  load of food needing digestion  in  the  int

Left and right side displacement of abomasum, Left side displacement of abo...

Left side displacement of abomasum (LDA) E tiology: It occurs commonly in large-sized, high producing adult dairy cows, immediately after parturition. High yielders are

Explain about the net protein ratio (npr), Explain about the Net Protein Ra...

Explain about the Net Protein Ratio (NPR)? This method was introduced by Bender and Doell (1957) and is a modification of the PER method. In this method, an allowance is made f

Name stems of plants which are leaf like, Which of the below are stems of p...

Which of the below are stems of plants that are leaf like in form, are green and perform functions of leaves. Additionally, they may bear fruit, flowers and temporary leaves?

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