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Institute of Physiology, Faculty of Medicine, University of Lausanne and Departments of Surgical Intensive Care, Internal Medicine, and Radiology, University Hospital, CH-1011 Lausanne, Switzerland
Received 21 July 1995; accepted in final form 25 June 1996.
Bracco, David, Daniel Thiébaud, René L. Chioléro, Michel Landry, Peter Burckhardt, and Yves Schutz.
Segmental body composition assessed by bioelectrical impedance
analysis and DEXA in humans. J. Appl.
Physiol. 81(6): 2580-2587, 1996.
The present study assessed the relative contribution of each body segment to whole
body fat-free mass (FFM) and impedance and explored the use of
segmental bioelectrical impedance analysis to estimate segmental tissue
composition. Multiple frequencies of whole body and segmental
impedances were measured in 51 normal and overweight women. Segmental tissue composition was independently
assessed by dual-energy X-ray absorptiometry. The sum of
the segmental impedance values corresponded to the whole body value
(100.5 ± 1.9% at 50 kHz). The arms and legs contributed to 47.6 and 43.0%, respectively, of whole body impedance at 50 kHz, whereas they represented only 10.6 and 34.8% of total FFM, as
determined by dual-energy X-ray absorptiometry. The trunk averaged
10.0% of total impedance but represented 48.2% of FFM. For each
segment, there was an excellent correlation between the specific
impedance index
(length2/impedance) and FFM
(r = 0.55, 0.62, and 0.64 for arm,
trunk, and leg, respectively). The specific resistivity was in a
similar range for the limbs (159 ± 23 cm for the arm and 193 ± 39 cm for the leg at 50 kHz) but was higher for the trunk (457 ± 71 cm). This study shows the potential interest of segmental body
composition by bioelectrical impedance analysis and provides specific
segmental body composition equations for use in normal and overweight
women.
dual-energy X-ray absorptiometry; body segments; body fat; fat-free mass
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