title: Comparison of amplitude-mode ultrasound versus air displacement plethysmography for assessing body composition changes following participation in a structured weight-loss programme in women.
abstract: The purpose of this study was to compare body composition changes as measured by A-mode ultrasound (US) versus a criterion densitometry-based measure, air displacement plethysmography (ADP), over a 4-week weight-loss protocol in healthy, non-obese young women. Twenty healthy, young female volunteers were provided with customized dietary plans for the length of the study intended to facilitate a 500 calorie-a-day deficit. Subjects also performed 3 h a week of supervised aerobic exercise. Per cent fat mass and lean body mass were obtained via ADP and US both pre- and postintervention. Pretesting, post-testing and delta data for %fat resulted in no significant differences in mean values along with a slope of the regression line no different than one and a y-intercept no different than zero (P<0·05). Similar to %fat values, pretesting, post-testing and delta data for fat-free mass resulted in no significant differences in mean values along with a slope of the regression line no different than one and a y-intercept no different than zero (P<0·05) with the exception of the delta for slope (0·39, P = 0·04). The current findings indicate that US can provide a similar degree of accuracy for tracking group-based fat loss in women compared to ADP. Given the low-cost relative to DXA and ADP, researchers and practitioners therefore can consider US as a viable option for monitoring group-based changes in body fat over time.
authors.affiliation: Department of Health Science, Lehman College, Bronx, NY, USA.
authors.forename: Brad J
authors.initials: BJ
authors.lastname: Schoenfeld
authors.affiliation: California State University, Northridge, CA, USA.
authors.forename: Alan A
authors.initials: AA
authors.lastname: Aragon
authors.affiliation: United States Sports Academy, Daphne, AL, USA.
authors.forename: Jordan
authors.initials: J
authors.lastname: Moon
authors.affiliation: Weightology, LLC, Redmond, WA, USA.
authors.forename: James W
authors.initials: JW
authors.lastname: Krieger
authors.affiliation: Department of Health Science, Lehman College, Bronx, NY, USA.
authors.forename: Gul
authors.initials: G
authors.lastname: Tiryaki-Sonmez
mesh_terms: D050154:Adiposity; D000328:Adult; D001823:Body Composition; D031204:Caloric Restriction; D015444:Exercise; D005260:Female; D064368:Healthy Volunteers; D006801:Humans; D010991:Plethysmography; D011237:Predictive Value of Tests; D015203:Reproducibility of Results; D013997:Time Factors; D016896:Treatment Outcome; D014463:Ultrasonography; D015431:Weight Loss; D061217:Weight Reduction Programs; D055815:Young Adult
keywords: assessment; body composition; measurement; modality; technique