STEM与日常科技·英语30篇（7）

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智能体重秤为何通过足部电极检测身体含水量

Smart scales send a safe, low-voltage electrical current through your feet using stainless-steel electrodes.
Since water conducts electricity better than fat or muscle, the current's speed reveals body hydration status.
The scale measures resistance (impedance) across multiple frequencies to distinguish intracellular from extracellular fluid.
Algorithms cross-reference impedance data with height, age, gender, and recent activity logs.
Results update daily in companion apps, showing trends rather than one-time snapshots.
Calibration requires bare feet and consistent timing—ideally before breakfast and after resting.
This bioelectrical impedance analysis (BIA) method is FDA-cleared for home wellness use.
It cannot diagnose medical conditions but helps users notice dehydration patterns early.
Environmental humidity and skin temperature affect readings, so advanced models auto-compensate using onboard sensors.
Researchers validated accuracy against clinical DEXA scans within ±2.3% for healthy adults.