Body composition3

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  • National Institute of Health and Fitnessgram
  • Body composition3

    1. 1. • DEFINITION: Describes the percentages of fat, bone, muscle, and fluid that make up body weight Factors that affect a person’s body composition: • Heredity • Diet • Exercise • Occupation
    2. 2. Body Composition • Two people who have the same height and the same body weight may look completely different from each other because they have a different body composition
    3. 3. Healthy Body Fat Percentages MALE FEMALE Adults 13-17 % 20-25% Adolescents 10-20% 15-25% • Why are adolescent recommendations different than those of adults? Kids grow and develop at different times • Why are boys and girls recommendations different? Boys and girls have different hormones that effect their body composition and girls have 1/3 less muscle fiber than boys
    4. 4. Ways to Measure • SKINFOLD MEASUREMENTS: Measures layer of fat under skin (± 3% error) • BIOELECTRIC IMPEDANCE: Estimates amount of fat by the amount of electrical current needed to travel through body (± 3 %)
    5. 5. Ways to Measure (cont) • Hydrostatic Weighing: Estimates fat by measuring water displacement (± 1.5%) • Body Mass Index (BMI): Describes appropriateness of height and weight (does not measure body fat) (± 5-6%)
    6. 6. ASSESSMENT OF BODY COMPOSITION Doctor’s Office • BMI Personal Trainer • Bioelectric Impedance • Hydrostatic Weighing • Skinfold measurements
    7. 7. Benefits of Improved Body Composition • Decrease levels of body fat that cause obesity • Decrease risk of coronary heart disease • Decrease chances for stroke • Decrease chances for diabetes • Lower blood pressure • Lower Cholesterol levels

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