chapter6bodycomp - Chapter 6 Chapter Body Composition...

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Chapter 6 Chapter 6 Body Composition Assessment
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Key Terms Key Terms Overweight(fat): Excess body weight against a given standard such as height or recommended percent body fat; less than obese Obesity: A chronic disease characterized by excessive body fat in relation to lean body mass; usually at least 30% above recommended body weight Essential fat: Minimal amount of body fat needed for normal physiological functions; constitutes about 3% of total weight in men and 12% in women Storage fat: Body fat in excess of essential fat; stored in adipose tissue
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5.1 Percentage of U.S. Adults Who Are Percentage of U.S. Adults Who Are Overweight and Obese Overweight and Obese ~ 66% are overweight 30.5% are obese
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Key Terms Key Terms Body composition: The fat and nonfat components of the human body; important in assessing recommended body weight Percent body fat: Proportional amount of fat in the body based on the person’s total weight; includes both essential and storage fat Lean body mass: Body weight without body fat Recommended body weight: Body weight at which there seems to be no harm to human health (healthy weight)
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Essential fat constitutes about 3% of the total weight in men and 12% in women 4.1 Typical Typical Body Body Composition Composition of an Adult of an Adult Man and Man and Woman Woman
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Body Composition Classification Body Composition Classification according to Percent Body Fat according to Percent Body Fat
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Hydrostatic Weighing Hydrostatic Weighing Underwater weighing Most common technique used for decades A person’s “regular” weight is compared with underwater weight Fat is more buoyant than lean tissue Almost all other indirect techniques have been validated against hydrostatic weighing
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Hydrostatic Weighing Hydrostatic Weighing Drawbacks Drawbacks Time consuming Not feasible to test large number of people Requires measurement of residual lung volume (if unknown, can be estimated) Difficult to perform on the aquaphobic
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Skinfold Thickness Skinfold Thickness Based on the principle that approximately half of the body’s fatty tissue is directly beneath skin Reliable measurements of this tissue give a good indication of percent body fat Skinfold test is done with pressure calipers Several sites are measured and percent fat is estimated from the sum of the three sites using Tables 4.1 (women) and 4.2 or 4.3 (men) All measurements should be taken on the right side of the body
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Bioelectrical Impedance Bioelectrical Impedance Simpler to administer, but accuracy is questionable Sensors are applied to the skin and a weak electrical current is run through the body to estimate body fat, lean body mass, and body water Based on the principle that fatty tissue is a less-efficient conductor of an electrical current The easier the conductance, the leaner the individual Body weight scales with special sensors on the surface may also be used to perform this procedure
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Air Displacement
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chapter6bodycomp - Chapter 6 Chapter Body Composition...

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