Body fat analysers use four plantar electrodes integrated in a body scale to measure the foot-to-foot resistance and estimate body fat by using a proprietary equation. The variation of this resistance with the contact area between feet and electrodes has been investigated by using a podoscope permitting to photograph feet soles and electrodes. This resistance was found to decrease when current electrode area increased. The reproducibility of the electronics was excellent (< 2Ω) in measurements repeated without changing feet position, but the mean standard deviation was 3.5 to 4 Ω when the subject stepped down at each measurement due to feet position changes.

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