ch 7 Flashcards
(36 cards)
obesity rates
increase over time, recently decreased slightly
1 pound of fat
3500 calories
weight bias effects
more obesity
basal metabolism
Energy to maintain itself (except digestion); largest component of energy expenditure; many factors can increase or decrease it: lean body mass, aging, stress, excess thyroid hormones, illness/injury, caffeine, decrease BMR: insufficient thyroid hormone
thermic effect of food
Cost of digestion and absorption of nutrients
physical activity
Voluntary activities
Most variable component of energy expenditure
adaptive thermogenesis
Nonvoluntary physical activity triggered by reflexes (shivering)
BMI CALCULATING
Weight (lbs) times 703/ height (in)^2
Determine height in inches
Square it
Weight times 703
Divide by height in inches
energy outputs:
basal metabolism, thermic effect of food, physical activity, adaptive thermogenesis
bmi underweight
less than 18.5
bmi overweight
25-29.9
bmi healthy
18.5-24.9
bmi obese
30+
BMI limits
- doesn’t indicate fat
- doesn’t indicate fat location
limited BMI use for:
Athletes with low body fat %
Pregnant women
Adults > 65
Women > 50 with little muscle
ways to assess body composition
Skinfold
Underwater weighing
Bod pod
Dexa
Bioelectrical impedance (scale for fat %)
unhealthy men waist
more than 40
unhealthy women waist
more than 35
lots of visceral fat
central obesity
do men or women have more of an apple shape and higher central obesity
men
% of overweight/obese adults
75
comb calorimeter
measures calorie content of a food
brown adipose tissue1
5% BW; participates in thermogenesis
BMR
mainly bc of liver and lean muscle mass