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 the phenomenon of apical dominance in plants, What is the phenomeno...

What is the phenomenon of apical dominance in plants? How can it be artificially eliminated? Apical dominance is the phenomenon by which high (over the positive range limit) au

Drug management for gout disease, Q. Drug Management for gout disease? ...

Q. Drug Management for gout disease? Drugs are so effective in lowering the serum mate concentration that rigid restriction of dietary purines is rarely necessary. Uricosurie d

Digestive system of animals, Q. Why is the digestive system of these animal...

Q. Why is the digestive system of these animals called incomplete? Incomplete digestive system is in that which the digestive cavity has only one opening.

Relation of water content to functions, Relation of Water Content to Functi...

Relation of Water Content to Functions If an aquatic plant appearing turgid is removed from water and left in the open, it quickly wilts. The water content of the leaves may

Epiboly - mechanism of gastrulation, EPIBOLY - The epibolic movement...

EPIBOLY - The epibolic movements occur only in the prospective ectodermal blastomeres. In the blastula of frog, migration and rearrangement of microceres over megameres i

What treatment should be used for constrictive pericarditis, Q. What treatm...

Q. What treatment should be used for constrictive pericarditis? Medical Treatment 1) Judicious use of diuretics to alleviate systemic congestion. This may be enough in s

What is the nitrogen cycle, Q. What is the nitrogen cycle? The nitrogen...

Q. What is the nitrogen cycle? The nitrogen cycle represents the recycling and circulation of the chemical element nitrogen in nature. The nitrogen cycle fundamentally depends

Determine the term - neuropsychologists and neurologists, Determine the ter...

Determine the term - Neuropsychologists and neurologists Neuropsychologists and neurologists studying behaviour have been greatly concerned with localisation of function in the

Head stream of highland brook zone, Head stream of Highland brook zone ...

Head stream of Highland brook zone This is formed by a number of small streams, which originate from a marsh, a spring or a glacier. This is a small shallow zone with an irreg

Types of organization chart, Types of Organization Chart: There are  t...

Types of Organization Chart: There are  two important  types of organization chart.  a)  Vertical i.e.,  from top to bottom.  b)  Horizontal  i.e., from  left to right.

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