Effect of Aging on the Body Composition of Dialyzed Subjects Comparison with Normal Subjects

Biasioli, S; Foroni, Roberto; Petrosino, L; Cavallini, Lucia; Zambello, A; Cavalcanti, Gaetano; Talluri, Tony

doi:10.1097/00002480-199339030-00084

Cited by 15 publications

(13 citation statements)

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“…Regarding age, older subjects have smaller Xc values than younger ones at all three frequencies. Similar results for Xc measured at 50 kHz were reported for healthy Italian subjects (Biasioli et al, 1993; Denti et al, 1997). For Xc measured at 5 and 100 kHz, no comparative data are available.…”

Section: Discussionsupporting

confidence: 87%

Reliability and variability of bioimpedance measures in normal adults: Effects of age, gender, and body mass

Dittmar

2003

American J Phys Anthropol

197

121

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This study aimed to analyze the reliability and evaluate the causes of variability of bioimpedance parameters. Direct measures were analyzed because they are not affected by inappropriate prediction models. Resistance (R), reactance (Xc), and phase angle (PA) were determined at three fixed frequencies (5, 50, and 100 kHz) in 653 normal Germans (244 males and 409 females), aged 20-90 years, using a phase-sensitive whole-body tetrapolar bioimpedance analyzer (BIA 2000-M, Data Input, Germany). From these values, six bioimpedance ratios were calculated (R(5)/R(50), R(5)/R(100), Xc(5)/Xc(50), Xc(5)/Xc(100), PA(5)/PA(50), and PA(5)/PA(100)). Reliability of duplicate measurements, as determined by technical error, is high. ANOVA for repeated measurements yields a significant frequency main effect (within-subjects factor) and significant effects of age and gender (between-subject factors) on variation of resistance, reactance, and phase angle. Multiple regression analyses indicate independent effects of age, gender, and body mass index on variability of resistance, reactance, and phase angle at the three frequencies. Gender primarily influences variation in resistance (smaller values in males), whereas age mainly affects variations in reactance and phase angle (smaller values in older adults). Obesity is associated with smaller resistance (at all frequencies) and smaller reactance (high frequencies), but larger phase-angle values (low frequency). The study shows that variability of direct bioimpedance measures depends on age, gender, and body mass characteristics of the study population. The potential benefit for using both low and high frequencies in R measures is to differentiate between extra- and intracellular fluid spaces, which may be altered during human growth and aging.

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Section: Discussionsupporting

confidence: 87%

Reliability and variability of bioimpedance measures in normal adults: Effects of age, gender, and body mass

Dittmar

2003

American J Phys Anthropol

197

121

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“…With the errors caused by aspect ratio and cell membrane thickness, it is unclear why a surface measurement (i.e., C m ) would be used to reflect what is inside the cells when it can be determined more directly by a resistivepredicted ICW (ICW R ). A single 50-kHz-frequency measure of X and u, and an R-X graph have been proposed as measures of fluid distribution and discriminating indexes of health and disease (2,36). Recently, u-angle spectrum analysis (that is, u vs. f) has been proposed as descriptive of body water and body composition (4).…”

Section: Discussionmentioning

confidence: 99%

Predicting body cell mass with bioimpedance by using theoretical methods: a technological review

Lorenzo

Andréoli

Matthie³

et al. 1997

Journal of Applied Physiology

558

564

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The body cell mass (BCM), defined as intracellular water (ICW), was estimated in 73 healthy men and women by total body potassium (TBK) and by bioimpedance spectroscopy (BIS). In 14 other subjects, extracellular water (ECW) and total body water (TBW) were measured by bromide dilution and deuterium oxide dilution, respectively. For all subjects, impedance spectral data were fit to the Cole model, and ECW and ICW volumes were predicted by using model electrical resistance terms RE and Rt in an equation derived from Hanai mixture theory, respectively. The BIS ECW prediction bromide dilution was r = 0.91, standard error of the estimate (SEE) 0.90 liter. The BIS TBW prediction of deuterium space was r = 0.95, SEE 1.33 liters. The BIS ICW prediction of the dilution-determined ICW was r = 0.87, SEE 1.69 liters. The BIS ICW prediction of the TBK-determined ICW for the 73 subjects was r = 0.85, SEE = 2.22 liters. These results add further support to the validity of the Hanai theory, the equation used, and the conclusion that ECW and ICW volume can be predicted by an approach based solely on fundamental principles.

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“…In addition, when compared to age-and sexmatched normal controls [6], the predialysis group had Predialysis patients had significantly higher body weight (28%) and body mass index (26%) than established a significantly higher observed to predicted ratio for body cell mass than the hemodialysis and transplant cohort. hemodialysis and renal transplant patients (table 2).…”

Section: Evaluatedmentioning

confidence: 91%

“…Equations provided by the manufacturer were used to calculate fat free and body cell mass [4][5][6]. The latter parameter is inclusive of total protein and intracellular water, and…”

Section: Dietary Restrictions and Uremia To Further Define Thismentioning

confidence: 99%

Nutritional Status Assessment and Body Composition Analysis in Pre-End Stage Renal Disease Patients

Dumler

Kilates

1999

Mineral Electrolyte Metab

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Malnutrition is a known risk factor for survival in renal failure patients. Of concern, a significant degree of malnutrition may develop in the predialysis period due to dietary restrictions and uremia. To further define this issue, we evaluated 25 predialysis patients using serum chemistries, body mass index (BMI), fat free mass (FFM), body cell mass (BCM), and protein appearance rate (PAR) as surrogates of nutritional status and compared their results to those obtained in established hemodialysis patients and recipients of living donor renal allografts during a nine-month observation period. Pre- dialysis patients had significantly (p<0.0001) higher body weight (28%), body mass index (26%), body cell mass (17%) and fat free mass (15%) than hemodialysis and transplant patients. Intracellular water content was similar in all groups. As many patients do not start dialysis until clearance values fall below 10 ml/min, it is possible that greater tissue mass losses occur in the weeks preceding initiation of dialytic therapy. Why renal transplant recipients fail to increase tissue mass may relate to the catabolic effects of immunosuppression. We conclude that the early stages of pre-end stage renal disease are associated with relatively good preservation of body cell mass.

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Effect of Aging on the Body Composition of Dialyzed Subjects Comparison with Normal Subjects

Cited by 15 publications

References 0 publications

Reliability and variability of bioimpedance measures in normal adults: Effects of age, gender, and body mass

Reliability and variability of bioimpedance measures in normal adults: Effects of age, gender, and body mass

Predicting body cell mass with bioimpedance by using theoretical methods: a technological review

Nutritional Status Assessment and Body Composition Analysis in Pre-End Stage Renal Disease Patients

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