Ch 8 Exercise Testing and Prescription

What is the density of fat?

0.901 g/cm³

What is the density of FFM?

1.10g/cm³

Are the densities of fat and FFM components (water, protein, mineral) constants for everyone?

yes

Besides water, protein, and mineral, what density is the same for FFM within an individual?

various tissues

What does the individual being measured vary from in the reference body?

amount of body fat

What 4 things does Hydrodensitometry (underwater weighing) tell us?

valid and reliable densitometric method, estimated total body volume (BV), requires total body submersion, computation of Db (Db = total body mass/BV)

Air displacement Plethysmography (Bod Pod) has what two components?

viable alternative to densitometric method for HW, based on Boyle’s law of pressure-volume relationship

What are the percentages of FFM components?

73.8% water, 19.4% protein, 6.8% mineral

What are the 5 things that can make FFM density vary?

age, sex, ethnicity, physical activity, and %BF

What is the variance within FFM due to?

percent water and percent mineral within FFM

2 Component models are what?

densitometric models

Multicomponent models measure what?

body composition

What do multicomponent models do?

eliminate much of guesswork in 2C model assumptions, measure % water and % mineral

What are the 3 components of a DXA scan?

three component model, uses two X-ray beam frequencies, best method to estimate mineral contribution to FFM

What are the 4 field methods for assessing body composition?

skin folds, bioelectrical impedance, ultrasound, anthropometric measurements