Which method of assessment estimates body composition by utilizing air to assess density?

The method of assessment that estimates body composition by utilizing air to assess density is indeed air displacement plethysmography. This technique works by measuring the volume of air displaced by a person's body when they are seated in a chamber. By knowing the volume of air displaced and the person's weight, the density of the body can be calculated. This measurement is particularly useful because it provides an accurate estimation of body fat percentage and fat-free mass.

Air displacement plethysmography is often considered more comfortable and less invasive than some other body composition assessment methods. It is an appealing choice for both clinical and fitness settings due to its precision and ease of use with various populations.

In contrast, skinfold measurements involve pinching specific areas of the body to estimate subcutaneous fat and require a certain level of skill for accuracy. Bioelectrical impedance analysis estimates body composition based on the resistance of electrical flow through body tissues but does not use air displacement. DEXA scans utilize dual-energy X-ray absorptiometry to measure bone density and body composition, but again, it does not measure air displacement. Each of these methods has its own set of strengths and weaknesses, but for assessing body composition using air, air displacement plethysmography is the appropriate choice.