Wearable Device for Continuous and Real-Time Monitoring of Human Sweat Sodium.

Area of Science:

• Biomedical Engineering
• Wearable Technology
• Analytical Chemistry

Background:

• Wearable sweat-sensing devices offer non-invasive health monitoring but face challenges in accuracy, reliability, and stability.
• Continuous monitoring of physiological markers like sodium levels is crucial for health and performance.

Purpose of the Study:

• To develop a wearable system for real-time monitoring of human sweat sodium levels.
• To address challenges in data accuracy, sensor reliability, and measurement stability in wearable health-monitoring devices.

Main Methods:

• Integration of a novel microfluidic chip with vertical channels and hydrophilic materials for optimized sweat flow and contamination prevention.
• Development of a compact wearable potentiostat for precise electrical current measurement across a wide dynamic range (nA to mA).
• Validation of sodium concentration measurements (10 mM to 200 mM) against laboratory instruments.

Main Results:

• The developed system achieved accurate sodium concentration measurements with a coefficient of variation below 4%.
• Excellent agreement was observed between the wearable device and laboratory instruments (intraclass correlation = 0.998).
• Real-time monitoring during exercise showed a decrease in sweat sodium levels (101 mM to 67 mM over 30 min), reflecting physiological responses.

Conclusions:

• The wearable system demonstrates reliability for continuous, real-time sweat sodium monitoring.
• This technology advances wearable health monitoring, supporting fitness optimization and personalized hydration strategies.
• Future research will focus on multi-biomarker integration and clinical trials.