Exam 3 Flashcards
(334 cards)
What is bariatrics?
Field of medicine that offers treatment to overweight people with a comprehensive program
Includes diet and nutrition, exercise, behavior modification, and lifestyle changes
May be indicated for appetite suppressants and other appropriate meds
Define body composition
Ratio of fat-free (bone, muscle, and water) to fat mass (adipose)
Expressed as percentage of body-fat or percentage of lean body mass
Define BMI
Accounts for height and weight to determine obesity
What BMI determines obesity?
> 30
Why is BMI measurement flawed?
Does not separate body fat from other body tissue
What body fat % determines if a man is obese?
25%
What body fat % determines if a woman is obese?
> 30%
Define body fat measurement
Take body fat compared to the other weight of the body
What BMI is considered morbidly obese?
> 40
What other comorbidities is obesity linked to?
MS disorders
Pain
Reduced cognitive performance
What is the BMI formula?
Mass (lb) x 703/height (in)^2
Define overweight in terms of body fat
Excessive amount of body weight that includes mm, bone, fat, and water
What is hydrostatic weighing?
Subtract body weight measured in water during submersion from body weight on land
= Displaced water
What variables must you know prior to hydrostatic weighing?
Residual volume
Density of water (altered with temp)
Estimated gas trapped in GI system
Dry body weight
What is important to do before submerging individual in water?
Exhale as much air as possible
What is the reliability of hydrostatic weighing?
High reliability
Gold standard
Define Archimedes’ Principle
Law of physics
Upward force (buoyancy) of body immersed in fluid EQUALS the weight of displaced fluid
What is Air Displace Plethysmography?
AKA BOD POD Sys
Subtracting volume of air in chamber when subject is in chamber from volume of air when chamber is empty
Thoracic gas volume is measured and subtracted
What is the reliability of the BOD POD?
High reliability, but not as high as hydrostatic weighing
What is DEXA?
Use low-level radiation to determine masses of fat, lean tissue, and bone mineral content
Also used in osteoporosis and osteopenia patients
What is the limitation of DEXA?
> 300 lbs
What is the theory of bioelectrical impedance?
Lean tissue (mostly water and electrolytes) is a GOOD electrical CONDUCTOR (low impedance)
Fat is a POOR electrical CONDUCTOR and acts as impedance to electrical current
How does bioelectrical impedance work?
Subject stands or grasps onto stainless steel electrodes or analyzer
What is a drawback to bioelectrical impedance?
Underestimate body fat for those who are obese and overestimates for those who are lean