Lesson 8 Nutrition
Terms in this set (35)
DXA (dual energy x-ray absorptiometry)
method to assess body composition that uses very low-dose beams of x-ray energy to measure total body fat mass, fat distribution pattern, and bone density
lean body mass
body weight without fat
an excess amount of weight against a given standard, such as height or recommended percent body fat
deposits of fat directly under the skin
techniques to measure body girths at different sites
extremely low body weight
having a fear of water
commercial name of the equipment used to assess body composition through the air displacement technique; based on Boyle's Law (P1V1=P2V2)
technique to assess body composition by calculating the body volume from the air replaced by an individual sitting inside a small chamber
percent body fat
proportional amount of fat in the body based on the person's total weight; includes both essential fat and storage fat; also termed fat mass
body fat in excess of essential fat; stored in adipose tissue
recommended body weight
body weight at which there seems to be no harm to human health; healthy weight
obesity pattern seen in people who store fat primarily around the hips and thighs
technique to determine thinness and excessive fatness that incorporates height and weight to estimate critical fat values at which the risk for disease increases
an excessive accumulation of body fat, usually at least 30% above recommended body weight
underwater technique to assess body composition; considered the most accurate of the body composition assessment techniques
obesity pattern seen in individuals who tend to store fat in the trunk or abdominal area
the fat and non-fat components of the human body; important in assessing recommended body weight
minimal amount of body fat needed for normal physiological functions; constitutes about 5% of total weight in men and 10% in women; found within tissues such as the muscles, nerve cells, bone marrow, intestines, heart, liver, and lungs
technique to assess body composition by measuring circumferences at specific body sites; anthropometric measurement; least valid for individuals who participate in strenuous activity or can be visually classified as thin or obese
a waist girth measurement to assess potential risk for disease based on intra-abdominal fat content
BIA (bioelectrical impedance)
technique to assess body composition by running a weak electrical current through the body
technique to assess body composition by measuring a double thickness of skin at specific body sites
assessing body composition using skinfold thickness is based on the principle that the amount of subcutaneous fat is proportional to total body fat (T/F)
what is the average body fat % for men? for women?
body weight (lbs) x body fat percentage (decimal)
how do you calculate fat weight?
body weight (lbs) - fat weight (lbs)
how do you calculate lean body weight?
lean body weight (lbs) / (1-desired body fat % (decimal))
how do you calculate recommended body weight?
track body fat change
what is the best use of a body composition assessment?
what was the previous "gold standard" technique of body composition assessment?
amount of air not expired during hydrostatic weighing
what is hydrostatic weighing based on?
changes in water hydration from activity and exercise can affect skinfold girth
why should skinfold measurement be done at the same time of the day, preferably in the morning?
BIA (bioelectrical impedance)
technique where an electrical current is run through the subject's body
body weight (lbs) x 703/(height in inches squared)
how do you calculate BMI?