Development of Whole-Body Salt Loss Measurement Technology Using Wearable Salt Concentration Sensor

This study developed a wearable salt concentration sensor for real-time monitoring of sweat salt concentration. Combined with a perspiration measurement device, it estimates total-body salt loss. Using the whole-body sweat collection and replacement method, a high correlation (r = 0.96) was shown between the sensor and an ion chromatography analysis. Additionally, a correlation (r = 0.88) was found between the estimated total salt loss measured by the sensor and perspiration measurement device, and that calculated from ion chromatography and weight loss. These devices enable accurate real-time estimation of total-body salt loss through sweat concentration and sweat rate.