During Bioelectrical Impedance Analysis (BIA), where does the mild electrical current travel?

Answer

Up one leg and down the other.

The mechanism for Bioelectrical Impedance Analysis (BIA) relies on measuring the resistance encountered by a low-level electrical current as it passes through the body. For standard smart scales designed for general body composition estimates, the pathway of this imperceptible current is established by the placement of the metallic contacts on the scale platform where the user stands. The current is sent up through one leg and then routed across the lower body to exit down the other leg. Since fat, muscle, and water all conduct electricity differently—they have distinct impedance values—the time and path taken by the current allow the scale's internal algorithm to calculate the relative proportions of these components making up the total mass. This segmented pathway is crucial for differentiating tissue types based on their conductive properties.

During Bioelectrical Impedance Analysis (BIA), where does the mild electrical current travel?

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