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Questions and Answers
What is the primary technique used in hydrostatic weighing?
What is the primary technique used in hydrostatic weighing?
What is the standard error of estimate for hydrostatic weighing?
What is the standard error of estimate for hydrostatic weighing?
What is a major consideration when using hydrostatic weighing?
What is a major consideration when using hydrostatic weighing?
How long does the hydrostatic weighing procedure typically take?
How long does the hydrostatic weighing procedure typically take?
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What is a limitation of hydrostatic weighing compared to other methods?
What is a limitation of hydrostatic weighing compared to other methods?
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What additional measurement may be needed when conducting hydrostatic weighing?
What additional measurement may be needed when conducting hydrostatic weighing?
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Which of the following is true about hydrostatic weighing's accuracy?
Which of the following is true about hydrostatic weighing's accuracy?
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Why might hydrostatic weighing be unsuitable for certain individuals?
Why might hydrostatic weighing be unsuitable for certain individuals?
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What is the primary method used for assessing body fat in women according to the three-site procedure?
What is the primary method used for assessing body fat in women according to the three-site procedure?
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What standard error of estimate is reported for girth measurements?
What standard error of estimate is reported for girth measurements?
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Which of the following factors can affect the results of bioelectrical impedance?
Which of the following factors can affect the results of bioelectrical impedance?
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Compared to waist circumference, which measurement is less effective at predicting disease risk?
Compared to waist circumference, which measurement is less effective at predicting disease risk?
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What is a characteristic of android obesity?
What is a characteristic of android obesity?
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Why might girth measurements be considered invalid for certain individuals?
Why might girth measurements be considered invalid for certain individuals?
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What is the typical percentage error range for body fat estimates using bioelectrical impedance?
What is the typical percentage error range for body fat estimates using bioelectrical impedance?
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What should be ensured while taking body measurement assessments for the best accuracy?
What should be ensured while taking body measurement assessments for the best accuracy?
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What does dual-energy X-ray absorptiometry primarily assess in body composition?
What does dual-energy X-ray absorptiometry primarily assess in body composition?
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Essential fat is essential for which physiological function?
Essential fat is essential for which physiological function?
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Which of the following best describes 'overweight'?
Which of the following best describes 'overweight'?
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What is the role of storage fat in the human body?
What is the role of storage fat in the human body?
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Obesity is classified as excessive accumulation of body fat above what percentage?
Obesity is classified as excessive accumulation of body fat above what percentage?
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Lean body mass refers to body weight without which of the following?
Lean body mass refers to body weight without which of the following?
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Which of these is NOT a function of fat in the human body?
Which of these is NOT a function of fat in the human body?
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What is considered a recommended body weight?
What is considered a recommended body weight?
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Study Notes
Body Composition Assessment Techniques
- Hydrostatic Weighing: Most accurate underwater technique for assessing body composition with a standard error of estimate of +/- 0.5%.
- Dual-Energy X-ray Absorptiometry (DEXA): Uses low-dose x-ray beams to measure body fat and bone density, taking less than 15 minutes with an error margin of +/- 1.8%. It is costly and not widely available.
- Air Displacement: Calculates body volume by measuring air displaced in a chamber, has an error margin of +/- 2.2%, and may overestimate body fat percentage.
- Skinfold Thickness: Involves measuring double-thickness of skin at specific body locations to estimate body fat; requires training for accurate assessment.
- Girth Measurements: Measures circumference at specified sites such as waist and hips with an error margin of +/- 4.0%. May not apply to athletically built or visually thin individuals.
- Bioelectrical Impedance: Utilizes sensors to pass a weak electrical current through the body, calculating resistance to assess body fat. Results can vary significantly, with a possible error margin of 10 percentage points or more, affected by hydration levels.
Essential vs. Storage Fat
- Essential Fat: Necessary for normal physiological functions.
- Storage Fat: Accumulates in adipose tissue and around organs, providing insulation, energy substrate, and padding against trauma.
Terms Related to Body Weight
- Overweight: Excess weight relative to height or recommended body fat percentages.
- Obesity: Significant excess of body fat, generally defined as at least 30% above the recommended weight.
Body Mass Index (BMI)
- A technique assessing relative thinness or fatness using height and weight, indicating risk levels for various diseases.
Waist Circumference and Disease Risk
- Provides insight into disease risk, particularly with abdominal fat (android obesity) versus fat stored around hips and thighs (gynoid obesity).
- Waist circumference is often a better predictor of disease risk than BMI alone.
Recommended Body Weight (RBW)
- Determining recommended body weight involves assessing body composition and following a series of calculations based on body fat percentage.
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Description
Learn about various techniques used to assess body composition, including hydrostatic weighing, DEXA, and air displacement, and their accuracy levels.
