Obesity 1 (real first lecture).docx

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Kinesiology&Physical Education
EDKP 330
David J Pearsall

Body Mass Index 11/5/2012 4:08:00 PM Developed by Adolphe Quelet  Measure of obesity: measure a weight for specific height! o Doesn’t take into account specific body components (lean muscle vs fat)  Not a good measure for athletes  tend to have a higher BMI due to increased lean muscle giving a false reading of obesity  Not a good measure for youth  difference in growth spurt occurrence  Use percentiles instead: take into account age, weight, height, gender o Cannot be a clinical diagnostic tool  Useful screening mechanisms/physiological health assessment How to calculate it  Metric o BMI (kg/m )= weight (kg)/height (m) 2  Imperical o BMI (kg/m )= weight (pounds) x 703/height (inch)2 Classificiations of Body Weight  Underweight: <18.50  Normal range: 18.50-24.99  Overweight: >/equal to 25  Preobese 25-29.99  Obese >30.00 o Class 1: 30-34.99 o Class 2: 35-39.99 o Class 3: >/40  Extremely high risk, eligible for surgery for fat reduction Shows above that for youth we use percentiles instead of BMI b/c of variance in growth spurts/maturation  Takes into account heights, weight, age, gender th o Under weight: <5 percentile for age/gender o Normal weight: 5-85 percentile o Over weight: >/95 percentile o And Mortality 11/5/2012 4:08:00 PM For both men and women, there is an increased risk of death at extreme ends  J/U shape relationship  <18.5 i.e. underweight = increased risk  >26.5 i.e preobese – obese = increased risk  Men are more at risk at higher BMI’s then women Since 2000, there has been an increased amount of media attention to the obesity problem 11/5/2012 4:08:00 PM World health organizaion (WHO)  Rates of obesity DOUBLED from 1980-2011  65% of global population in countries where overweight/obesity kills more people than underweight Definition:  Men: >25% body fat  Females: >30% body fat overweight  too much body weight for given height/frame o an amount that increases disease risk  not considered a disease obesity  overall fat level that brings with is increased risk of fatal/serious diseases  can be overweight but no obese Caloric balance  Achieving and maintaining energy balance is a complex state that some people never attain o Many cycle in and out of energy balance throughout their lives o 2012 Dietary guidelines for Americans- guidance f
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