Body composition changes assessed by bioelectrical impedance measurements.
Twelve healthy volunteers consumed a very-low-calorie diet for 2 d to achieve a body-weight loss mainly from a loss of fat-free mass, ie, of glycogen plus water. Body weight, body density, and bioelectrical impedance were measured before and after weight loss. Body-weight loss was 1.3 +/- 0.5 kg. Loss of fat-free mass as measured by densitometry was 1.2 +/- 0.8 kg. Changes in body weight and fat-free mass measured by densitometry did not differ significantly and were significantly different from zero. Reduction of fat-free mass as determined by bioelectrical impedance was 0.5 +/- 0.8 kg, which was significantly different from body-weight loss and loss of fat-free mass as measured by densitometry but not significantly different from zero. The results show that after weight loss the bioelectrical impedance method overestimates the fat-free mass by approximately 1 kg.
Deurenberg
P
P
Department of Human Nutrition, Wageningen Agricultural University, The Netherlands.
Weststrate
J A
JA
van der Kooy
K
K
D000328:Adult; D001823:Body Composition; D004038:Diet, Reducing; D004553:Electric Conductivity; D005260:Female; D006003:Glycogen / Q000378:metabolism; D006801:Humans; D007424:Intracellular Fluid / Q000378:metabolism; D008297:Male; D015431:Weight Loss
D006003:Glycogen