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

What are d-glucose and d-galactose, D-glucose differs from D-galactose onl...

D-glucose differs from D-galactose only in the arrangement around carbon 4. Therefore D-glucose and D-galactose are- Select one: a. enantiomers b. epimers c. mirror ima

Define role of food industry, Define Role of Food Industry? Publication...

Define Role of Food Industry? Publications of major trade associations; industry standards; structure of the food industry; international food corporations; information on alli

Why networking in hospitals, WHY NETWORKING IN HOSPITALS Sharing of dat...

WHY NETWORKING IN HOSPITALS Sharing of data is essential, especially in any kind of hospital setting. For staff and doctors of a hospital, if they have details of patients rea

What are two characteristics of joints unique, What are two characteristics...

What are two characteristics that make synovial joints unique and different from other joints?

Homoeostasis, what stimulate the system in homoeostasis

what stimulate the system in homoeostasis

Are nematodes exclusively parasites, Are nematodes exclusively parasites? ...

Are nematodes exclusively parasites? There are parasitic roundworms, containing parasites of plants, but there are also free-living nematodes.

Explain the amphibian heart and the reptile heart, What is the difference b...

What is the difference between the amphibian heart and the reptile heart? The reptiles have double and incomplete circulation too, three heart chambers (two atria and one ventr

What is inertization, Q. What is Inertization? The process of "inertiza...

Q. What is Inertization? The process of "inertization" involves mixing waste with cement and other substances before disposal in order to minimize the risk of toxic substance c

Explain the loss of carotenoids, Explain the loss of carotenoids In pro...

Explain the loss of carotenoids In processing fruits and vegetables, loss of carotenoids into cooking or canning water is very slight. However, carotenoids undergo oxidation wh

Describe animal which limits activity to period of dim light, Which term is...

Which term is used to describe an animal which limits its activity to periods of dim light at dawn and dusk? a) Diurnal (pron: die-ER-nal) b) Vesperal (pron: VESS-per-al)

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