Body Composition of Obese Subjects by Air Displacement Plethysmography: The Influence of Hydration

OBJECTIVE: We investigated whether air displacement plethysmography (ADP) could detect small changes in body composition of obese subjects with alterations in hydration. RESEARCH METHODS AND PROCEDURES: Ten obese subjects (mean BMI, 39.3 ± 2.8 kg/m²) entered the ADP chamber without and with oil (1,...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
Veröffentlicht in:Obesity (Silver Spring, Md.) Jg. 15; H. 1; S. 78 - 84
Hauptverfasser: Le Carvennec, Marie, Fagour, Cédric, Adenis-Lamarre, Emilie, Perlemoine, Caroline, Gin, Henri, Rigalleau, Vincent
Format: Journal Article
Sprache:Englisch
Veröffentlicht: Oxford, UK The North American Association for the Study of Obesity 01.01.2007
Blackwell Publishing Ltd
Schlagworte:
Adipose Tissue
Adipose Tissue - metabolism
Adipose Tissue - physiology
adiposity
Adult
Aged
Air
air displacement plethysmograph
air displacement plethysmography
Bod Pod
Body Composition
Body Composition - physiology
Body Water
Body Water - metabolism
Body Water - physiology
Case-Control Studies
dehydration (animal physiology)
fat free mass
Female
Gastrointestinal surgery
Humans
Hydration
lean body mass
Male
measurement
measuring devices
men
metabolism
methods
Middle Aged
middle-aged adults
Muscle, Skeletal
Muscle, Skeletal - metabolism
Muscle, Skeletal - physiology
Nutrition
Obesity
Obesity - physiopathology
oils
physiology
physiopathology
Plethysmography
Plethysmography - methods
Plethysmography - standards
Reproducibility of Results
Research methodology
Sensitivity and Specificity
volume
water
weight change
Weight control
women
France
ISSN:1930-7381, 1930-739X
Online-Zugang:Volltext
Tags: Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
Beschreibung
Zusammenfassung:OBJECTIVE: We investigated whether air displacement plethysmography (ADP) could detect small changes in body composition of obese subjects with alterations in hydration. RESEARCH METHODS AND PROCEDURES: Ten obese subjects (mean BMI, 39.3 ± 2.8 kg/m²) entered the ADP chamber without and with oil (1, 2, or 4 liters), water (1, 2, or 4 liters), or mixed (1 liter oil + 1 liter water or 2 liters oil + 2 liters water) loads. Real and measured changes in body composition were compared by regression analysis and Bland-Altman procedures. RESULTS: The ADP-measured changes in volume did not differ from the real values and were strongly correlated with them (r = 0.98). In all cases, loads of differing composition and similar volume led to different values of fat, fat-free mass, and percentage fat. Water was detected as increased fat-free mass only with loads of >=2 liters, most of the water being falsely detected as increased fat mass. The observed changes were correlated with the real ones for fat mass (r = 0.68; p < 0.0001), fat-free mass (r = 0.66; p < 0.0001), and percentage fat (r = 0.61; p < 0.0001), but fat mass changes were overestimated by ~1 kg, and fat-free mass changes were underestimated by ~1 kg. This underestimation increased with the highest water loads, as shown by the Bland-Altman plot (r = -0.27; p < 0.05). Percentage fat changes were overestimated by 0.8% (p < 0.001); the magnitude of the error was correlated with the weight of the water load (r = 0.62; p < 0.0001). DISCUSSION: ADP accurately measures changes in body volume, discriminating small changes in body composition. It overestimates changes in adiposity, as most of the increased hydration is detected as an enlarged fat mass.
Bibliographie:http://www.obesityresearch.org/contents-by-date.0.shtml
ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 14
content type line 23
ISSN:1930-7381
1930-739X
DOI:10.1038/oby.2007.533