Differentiate between body size and body composition. What tissues of the body c
ID: 174590 • Letter: D
Question
Differentiate between body size and body composition. What tissues of the body constitute the fat free mass? What is densitometry? How is it used to assess the body composition of the athlete? What is the major weakness of densitometry with respect to its accuracy? What are the several field techniques for estimating body composition? What are their strength and weaknesses? What is the relationship of relative leanness and fatness to performance in sport? What guidelines should be used to determine the athlete's goal weight? What are the six categories of nutrients? What role does dietary carbohydrate play in endurance performance? How about fat? Protein? What is an appropriate protein allowance for a normally active adult man? For a woman? Discuss the value of using protein supplements to enhance performance in strength and endurance events. Should the athlete supplement Vitamins and minerals? How does dehydration affect exercise performance? What effect does dehydraExplanation / Answer
Answer 1.
Body composition is the term used to describe the different components that, when taken together, make up a person's body weight. The components include variety of tissue types which are metabolically active (lean tissues like muscle, bone, and organs) and metabolically active (fat tissue).
In contrast, body weight includes total weight i.e. it doesn’t consider the lean-to-fat ratio.
Fat-free mass (FFM) includes internal organs, bone, muscle, water and connective tissue.
Answer 2.
Densitometry is a method to determine body composition based on the density function. The method is based on a two compartment model of body composition, fat mass and fat free mass, based on Boyle’s law. It uses the inverse relationship between pressure and volume to derive body volume for a subject. If both volume and bodyweight are known body density can be calculated by using the following equation:
Body Density = mass/volume, where mass = body weight (kg) and volume = liters (l)
Measurement of %fat by densitometry relies on certain assumptions:
a) The proportions of body compartments other than fat (i.e. those that make up fat-free mass as shown in the image on the right) are relatively constant from person to person.
b) Subjects being measured differ from the reference standards for body composition only in their amounts of body fat.
c) The determination of body composition by densitometry also relies on certain factors that can affect fat-free mass composition and density. These include growth and maturation, physical training, aging, race, and sex. Some or all of these factors need to be taken into account when using densitometry for body composition assessment.
Answer 6.
The six classes of nutrients are: carbohydrate, protein, lipid (fat), water, vitamins, and minerals
Answer 9. Yes, the athletes can be supplemented with vitamins and minerals.
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