Questions and Answers
What is the primary technique used in hydrostatic weighing?
What is the standard error of estimate for hydrostatic weighing?
What is a major consideration when using hydrostatic weighing?
How long does the hydrostatic weighing procedure typically take?
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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?
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Which of the following is true about hydrostatic weighing's accuracy?
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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?
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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?
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Compared to waist circumference, which measurement is less effective at predicting disease risk?
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What is a characteristic of android obesity?
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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?
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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?
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Essential fat is essential for which physiological function?
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Which of the following best describes 'overweight'?
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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?
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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?
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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.
