How body size and composition affecting the bmr, Biology

Assignment Help:

How Body size and composition affecting the BMR?

Basal and resting energy expenditures are related to body size, being most closely correlated with the size of the fat-free mass (FFM), which is the weight of the body less the weight of its fat muss. The size of the FFM generally explains about 70 to 80 percent of the variance in RMR. FFM is the metabolically active tissue in the body; what we also call as the lean body mass (LBM) and so most of the variation in BMR between people can be accounted for by the variation in their FFM. For example, athletes with greater muscular development have approximately a 5% higher basal metabolism than non-athletic individuals. Thus, exercise can help maintain a higher lean body mass and hence a higher metabolic rate. Similarly, the lower basal metabolic energy requirement of women is primarily related to their generally lower amount of lean muscle mass (more of fat mass) as compared to men. The decline in BMR with increasing age is also to some extent the consequence of changes in the relative size of organs and tissues. Further larger people (big size) have higher metabolic rates than people of smaller size. In fact, individuals with greater surface area have higher metabolic rate. To illustrate, if two people of different heights weigh the same, the taller individual with the larger body surface area will have a higher metabolic rate. In adults with higher percentages Bf body fat composition, mechanical hindrances can also increase the energy expenditure associated with certain types of activity.


Related Discussions:- How body size and composition affecting the bmr

What is self-catalytic rnas, Q. What is self-catalytic RNAs? Ribozymes...

Q. What is self-catalytic RNAs? Ribozymes - Term 'ribozyme' was initially suggested by Thomas R. Cech, Nobel Prize winning biochemist, who discovered this class of RNA molecul

Define ultrasonic and sonic vibrations, Ultrasonic and sonic vibrations ...

Ultrasonic and sonic vibrations Cells of all types can be destructed by intense sonic and ultrasonic vibrations generated by magnetostrictive oscillations or peizo electric cry

Climax stage - hydrarch, Climax Stage - Hydrarch A variety of trees in...

Climax Stage - Hydrarch A variety of trees invade the woodland community which soon develop into the climax community. The nature of the climax is dependent upon the climate o

The similarities and differences of transposable elements, Discuss the simi...

Discuss the similarities and differences of transposable elements in E. coli, yeast, plants, and Drosophila.

Gene pool, Natural selection can therefore mean differential reproduction a...

Natural selection can therefore mean differential reproduction among members of the sarne gene pool. We earlier said that selection would promote those alleles that give rise to ph

Define the concept of public nutrition, Define the Concept of Public Nutrit...

Define the Concept of Public Nutrition? The rapidly changing global trends in the area of food consumption patterns, lifestyles and environment have a tremendous impact on the

Vertebrates & invertebrates, Evolution of vertebrates and invertebrates ner...

Evolution of vertebrates and invertebrates nervous system

After the morula stage what is the next stage, Q. After the morula stage wh...

Q. After the morula stage what is the next stage? What is the morphological feature that defines this stage? In the blastula stage the compactness is lost and an internal cavit

Define physical capacity tests for aerobic capacity, Define Physical Capaci...

Define Physical Capacity Tests for Aerobic capacity? Aerobic capacity has already been defined. Aerobic capacity is usually measured using a tread mill test in which the intens

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