Multi-frequency bioelectrical impedance for assessing total body water and extracellular water in elderly subjects

Article Abstract:

Research on the use of multi-frequency bioelectrical impedance for measurement of total body water (TBW) and extracellular water (ECW) in old people reveal the usefulness of such a method to evaluate TBW and ECW groups of elderly people. Errors in prediction are due to body water distribution and they are greater when compared to young and middle-aged people. Body weight, and impedance at frequencies 5 and 50 kHz were perfect predictors of ECW and TBW respectively 81 women and 36 men in the age group between 63-87 years served as subjects for the study.

Research, Electrophysiology, Water in the body, Body water

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Loss of total body water and extracellular water assessed by multifrequency impedance

Article Abstract:

Twelve subjects were measured for fat-free mass (FFM), total body water (TBW) and extracellular water with bioelectrical impedance at different frequencies before and three hours after giving a diuretic drug. A comparison of prediction formula developed before the test and the impedance results show an overestimation for losses of FFM and TBW at lower frequencies and near-precise values at higher frequencies. These findings show that a potential for error exists with multi-frequency impedance measurements of body fluid compartments.

Measurement, Body fluids

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Variability of body density and body impedance at different frequencies

Article Abstract:

A comparison of two methods of determining human body composition, densitometry and bioelectric impedance, was conducted on two groups of healthy subjects. Results indicate that the variability of underwater weighing was lower than for impedance measurement at the lower frequencies. Variability was observed to decrease as frequencies heightened. Therefore, results of body composition measurement using the impedance method should be interpreted carefully.

Analysis, Body composition, Variability (Psychometrics)

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