What Is the Difference Between a Multi-segmental vs a Traditional BIA Device?

Hand-to-hand BIA devices measure impedance passed between the arms, and the lower body is estimated based on the impedance measured in the upper body. Conversely, leg-to-leg devices measure impedance passed between the legs, and the upper body is estimated. For subjects with balanced upper and lower bodies, these traditional devices may provide reasonably accurate estimates for whole-body values. However, measurement accuracy is compromised if there is significant upper-lower imbalance (ex: due to top-heavy strength training). More importantly, multi-segment technology allows Charder devices to provide calculations for each segment separately, which is absolutely essential for advanced training and tracking.