Changes in body weight in relation to changes in body impedance were studied in six male and four female patients before and during dialysis. Before dialysis, fat-free mass from skinfolds was 46.5 +/- 6.8 kg, and total body water calculated from bio-electrical impedance was 36.9 +/- 5.2 kg. Body water expressed as a percentage of fat-free mass was calculated to be 80 +/- 4%. Mean weight loss, which was assumed to be only loss of water, was 2.7 +/- 0.7 kg. Total body impedance increased by 80 +/- 16 OMEGA from 495 +/- 39 OMEGA to 575 +/- 47 OMEGA. Weight loss and increased in body impedance were highly correlated (r = -0.91, P < 0.001). However, based on prediction formulas for total body water from bio-electrical impedance, the observed weight (water) loss should be associated with an increase in impedance of only 39 +/- 11 OMEGA. It is concluded that the impedance value before dialysis is a relatively low value, due to the low specific resistivity of the excess of extra-cellular water in the body before dialysis. As a consequence, prediction formulas for body composition from bio-electrical impedance, developed in normal hydrated subjects, overestimate body composition (total body water, fat-free mass) in subjects with oedema.

BODY IMPEDANCE MEASUREMENTS DURING DIALYSIS / Delorenzo, A; Barra, Pfa; Sasso, Gf; Battistini, Nino Carlo; Deurenberg, P.. - In: EUROPEAN JOURNAL OF CLINICAL NUTRITION. - ISSN 0954-3007. - STAMPA. - 45:(1991), pp. 321-325.

BODY IMPEDANCE MEASUREMENTS DURING DIALYSIS

BATTISTINI, Nino Carlo;
1991

Abstract

Changes in body weight in relation to changes in body impedance were studied in six male and four female patients before and during dialysis. Before dialysis, fat-free mass from skinfolds was 46.5 +/- 6.8 kg, and total body water calculated from bio-electrical impedance was 36.9 +/- 5.2 kg. Body water expressed as a percentage of fat-free mass was calculated to be 80 +/- 4%. Mean weight loss, which was assumed to be only loss of water, was 2.7 +/- 0.7 kg. Total body impedance increased by 80 +/- 16 OMEGA from 495 +/- 39 OMEGA to 575 +/- 47 OMEGA. Weight loss and increased in body impedance were highly correlated (r = -0.91, P < 0.001). However, based on prediction formulas for total body water from bio-electrical impedance, the observed weight (water) loss should be associated with an increase in impedance of only 39 +/- 11 OMEGA. It is concluded that the impedance value before dialysis is a relatively low value, due to the low specific resistivity of the excess of extra-cellular water in the body before dialysis. As a consequence, prediction formulas for body composition from bio-electrical impedance, developed in normal hydrated subjects, overestimate body composition (total body water, fat-free mass) in subjects with oedema.
1991
45
321
325
BODY IMPEDANCE MEASUREMENTS DURING DIALYSIS / Delorenzo, A; Barra, Pfa; Sasso, Gf; Battistini, Nino Carlo; Deurenberg, P.. - In: EUROPEAN JOURNAL OF CLINICAL NUTRITION. - ISSN 0954-3007. - STAMPA. - 45:(1991), pp. 321-325.
Delorenzo, A; Barra, Pfa; Sasso, Gf; Battistini, Nino Carlo; Deurenberg, P.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11380/11977
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