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

Explain about the radiation therapy, Explain about the Radiation Therapy? ...

Explain about the Radiation Therapy? Radiation therapy is one of the options for the treatment of various tumors. During the administration of radiation patients experience acu

What is constipation, Q. What is Constipation? Constipation is irregula...

Q. What is Constipation? Constipation is irregular, infrequent or difficult passage of faeces. It is the most common physiological disorder of the alimentary tract. It is chara

Malignant catarrhal fever (mcf), Malignant catarrhal fever (MCF) Malig...

Malignant catarrhal fever (MCF) Malignant catarrhal fever is invariably fatal generalized lymphoproliferative disease of cattle and sometimes of wild ruminants. It is common i

Express the monomer unit of a protein, Describe the monomer unit of a prote...

Describe the monomer unit of a protein and how monomer units are assembled into peptides.

Minerals requirements during congestive cardiac failure, Q. Minerals requir...

Q. Minerals requirements during congestive cardiac failure? Minerals: Since sodium and potassium are the major electrolytes associated with oedema, it is important that sodium

Temperate shrublands, These are areas where woody shrubs predominate rather...

These are areas where woody shrubs predominate rather then trees. In regions with a Mediterranean type of climate i .e., hot dry summers and cool wet winters, shrubs grow close tog

Difference between the concepts of karyotype and genome, Normal 0 ...

Normal 0 false false false EN-IN X-NONE X-NONE MicrosoftInternetExplorer4

Describe the factors that affect cardiac output, Describe the factors that ...

Describe the factors that affect cardiac output in a female athlete who is speed skating toward the finish line in an Olympic race

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