Understanding & Interpreting Body Composition Measures

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1 BODY COMPOSITION

2

3 Understanding & Interpreting Body Composition Measures Body composition = component of health-related fitness & = component of metabolic fitness Unlike other health-related fitness Not a performance measure No movement/performance is required Good Metabolic Fitness: Blood lipid levels BP Blood glucose Insulin levels Concepts of Physical Fitness 14e 3

4 Body Composition Measures Standards have been established for healthy levels of body fatness Too Low Borderline Good Fitness Marginal Male 5 or less At Risk Female 10 or less Concepts of Physical Fitness 14e 4

5 Lipid Functions Temperature regulation Shock absorption Regulation of essential body nutrients

6 Essential Fat Nonessential Fat Extra fat stored in body Min amount of fat necessary to be healthy Amenorrhea Absent / infrequent menstruation osteoporosis

7 Body Composition Measures (Cont) Health standards have been established for the Body Mass Index. Too Low Borderline Good Fitness Overweight Obesity 12 or less Concepts of Physical Fitness 14e 7

8 BMI

9 BMI does not detect differences in muscle & fat Individuals with high muscle mass may be overweight using BMI Muscle weighs more than fat!! BMI Limitations

10 Assessing body weight too frequently Can lead to incorrect information People vary in body weight from day-day even hour-hour!!! Short term changes in weight: water loss/water gain = Based on level of hydration Weigh once a week At the same time of day Concepts of Physical Fitness 14e 10

11 Methods Used to Assess Body Composition Dual-energy X-ray Absorptiometry (DXA) Underwater Weighing Bod Pod Skinfolds Bioelectric Impedance Analysis (BIA) Near-Infrared Interactance Anthropometry Concepts of Physical Fitness 14e 11

12 Dual-Energy X-ray Absorptiometry Gold standard measure of body composition X-ray technique Estimate body density (DXA) Can measure fat stored in different parts of the body Measure of choice for measuring bone mass Costly

13 Visceral Fat - DEXA

14

15 Underwater Weighing Person = weighed in air & underwater Difference in weight = assess levels of body fatness

16 Same principle as underwater weighing Uses air displacement Useful for special population Bod Pod

17 Bioelectric Impedance Analysis Based on measuring resistance to current flow Electrodes are placed on body Low doses of current are passed through skin Muscle = greater water content than fat better conductor & less resistance to current

18 Near-Infrared Interactance Use the absorption of light to estimate body fatness High standard of errors Not recommended

19 Girth measurements Chest, waist, abdomen, hip, bicep Inexpensive & practical Anthropometry

20 Skinfolds Measure subcutaneous fat One-half of the body s fat = located under skin Most common procedure in research

21

22 Concepts of Physical Fitness 14e 22

23 Other Diseases/Medical Complications Cancer risk Skin problems Impaired circulation Stroke Liver disease

24 Who Is More Fit & Healthy???

25 Physical Fitness: Protection From Health Risks of Obesity High levels of body fat does not increase disease risk if the individual has good metabolic fitness!!!!! Good Metabolic Fitness: Blood lipid levels BP Blood glucose Insulin levels

26 Fit Not Fat THUS, cardiovascular & metabolic fitness are good measurements of health rather than measuring fat

27 Regional Fat Deposition UPPER BODY ANDROID FAT VISCERAL FAT WAIST-TO-HIP INCREASE HEALTH RISK LOWER BODY GYNOID FAT SUBCUTANEOUS

28

29 Waist-to-Hip Ration Determine risk for disease associated with fat & weight distribution A high waist circumference relative to hip circumference yield a high ratio indicative of high visceral fat

30 Obesity: Multifactorial Disease Influenced by genetics & environment Genetic predispose a person to obesity IF exposed to certain environmental conditions Regular PA can overcome genetic predispositions to fatness

31 Somatotype (Body Type)

32 Set-Point Theory Body= programmed to be a certain weight/set-point If you deviate from this set-point body makes metabolic adjustments to return to normal

33 Set-Point Theory (Cont) Leptin Regulating Hormone Leptin= produced by adipose cells More fat the more leptin Increased levels: suppress appetite & increase metabolism Decreased levels: increase appetite & decrease metabolism Exercising help reset the set-point

34 Set-Point Theory (Cont) Body can accommodate a higher set-point Greater resistance to adopt to lower set-point Sensitivity to leptin is reduced among the obese set point increase

35 Basal Metabolic Rate Energy expenditure in rested state Amount of calories needed to maintain body to function under resting conditions BMR decreases with age with the loss of lean body mass Increasing muscle mass increases BMR Anaerobic exercise can increase resting energy expenditure

36 Creeping Obesity PA & BMR decreases with age Caloric intake decrease with age does not compensate for decreases in PA & BMR This increase in fatness over time = creeping obesity

37 Creeping Obesity Concepts of Physical Fitness 14e 37

38 Relationship Between PA & Body Composition Combination of regular PA and dietary restriction is the most effective means of losing body fat. Dieting alone weight loss = lean tissue Strength training can be effective in maintaining a desirable body composition Increase muscle mass expends more calories at rest IN OTHER WORDS. Higher BMR!! Concepts of Physical Fitness 14e 38

39 Target Zone - Body Fat Reduction Physical Activity Daily moderate PA; 3-6 days/wk vigorous PA Low-intensity aerobic exercise 55-70%HRR Diet Consistently and daily Modest caloric restriction Moderate meals minutes Concepts of Physical Fitness 14e 39

40 Health Risks Associated with Excessively Low Body Fatness Anorexia Nervosa Bulimia Anorexia Athletica Female Athlete Triad Muscle Dysmorphia (males) Fear of Obesity Purging Disorder Concepts of Physical Fitness 14e 40

41 Females & Exercise/Sport Female Athlete Triad Combination of 3 conditions: 1. Energy availability (E intake - EE) 2. Amenorrhea 3. Osteoporosis Can have one, two, or all three conditions Anorexia Athletica Related to participation in sports emphasizing body leanness Characterized by excessive, obsessive exercise May lead to anorexia nervosa

42 Muscle Dysmorphia A person becomes obsessed with the idea that they are not muscular enough Hold delusions that they are "skinny" or "too small" even when they are not reverse anorexia nervosa

43 Fear of Obesity Common among achievement-oriented teenagers Impose self-restriction on caloric intake because they fear obesity Stunting of growth Delayed puberty Delayed sexual development Decreased physical attractiveness

44 Purging Disorder Purging without bingeing

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