Body Composition Flashcards

Air displacement plethysmography (Bod Pod) measures body composition by assessing:

Answer: Body volume through air displacement in a sealed chamber

The Bod Pod calculates body volume from the amount of air displaced when a subject sits inside a sealed chamber, then derives body density and fat percentage using the Siri or Brozek equation.

Which statement about visceral adipose tissue (VAT) and athletic performance is most accurate?

Answer: Higher VAT is associated with greater insulin resistance and metabolic disease risk, even in athletes

Elevated visceral adipose tissue increases inflammatory cytokines and insulin resistance regardless of fitness level, posing metabolic health risks even in physically active individuals.

A distance runner's body fat drops from 12% to 8% of body weight over a competitive season without a planned weight loss goal. The CSSD's primary concern should be:

Answer: Low energy availability and potential Relative Energy Deficiency in Sport (RED-S)

Unintentional body fat loss in an endurance athlete suggests low energy availability, a hallmark of RED-S (formerly the Female Athlete Triad), with risks to bone health, hormonal function, and performance.

What is the primary limitation of using BMI to assess body composition in collegiate football linemen?

Answer: BMI cannot differentiate between fat mass and fat-free mass, classifying muscular athletes as 'obese'

BMI is weight divided by height squared and cannot distinguish muscle from fat; highly muscular athletes frequently fall in the 'obese' BMI category despite having low body fat percentages.

When counseling a female gymnast about body composition, which approach aligns with current CSSD ethical and clinical standards?

Answer: Focus on performance outcomes, functional strength, and adequate energy intake rather than weight targets

Current standards emphasize performance-based and health-centered goals over appearance or weight targets, particularly in aesthetically judged sports with elevated disordered eating risk.

The Brozek equation for converting body density to percent body fat is most accurate for which population?

Answer: Reference cadaver-validated young adult populations

The Brozek equation was derived from cadaver analysis of young adult reference populations and may be less accurate in children, older adults, or athletes with very different body composition than the reference sample.

Which assessment timing protocol minimizes pre-test variability when conducting serial BIA measurements on athletes?

Answer: Test in the morning after voiding, 2–3 hours post-meal, without recent intense exercise

Standardized conditions — morning, fasted state (2–3 h post-meal), voided bladder, no recent vigorous exercise — minimize fluid shifts and ensure reproducible BIA results across serial measurements.