Ultrasonic protocols for separately measuring subcutaneous fat and skeletal muscle thickness in the XXXX area.

@entity1 @entity291
Information regarding the use of brightness-mode (B-mode) ultrasound for separately measuring the thickness of subcutaneous fat and skeletal muscle in the @entity291 area was evaluated. Subjects were volunteers, 32 @entity1 and 32 @entity1 college students. Fat was measured with skinfold calipers and B-mode ultrasound. We used @entity291 circumference and B-mode ultrasound simultaneously to assess muscle size. Ultrasonic measurements of both fat and muscle were repeated within 30 minutes to evaluate reliability. @entity1 were 24 percent heavier than @entity1 but had a thinner fat layer as measured by skinfolds (49%) and ultrasound (29%). @entity1 also had a relatively larger @entity291 muscle as assessed by circumference (7%) and ultrasound (29%). Intraclass correlation coefficients were no less than .99 for repeated ultrasonic measurements of both fat and muscle for @entity1 and @entity1 ; therefore, these procedures are reliable for at least a short period of time. Associations between skinfolds and fat sonograms were high in @entity1 (r = .87) and moderate in @entity1 (r = .50). Associations between circumferences and muscle sonograms were moderately high in both @entity1 (r = .80) and @entity1 (r = .76). All four associations were statistically significant (p less than .05).
