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A mass-customizable dermal patch with discrete colorimetric indicators for personalized sweat rate quantification.

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This study introduces a disposable, colorimetric dermal patch for real-time sweat monitoring. The user-friendly patch provides accurate hydration level assessments, crucial for personalized health and performance tracking.

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Area of Science:

  • Biomedical Engineering
  • Wearable Technology
  • Personalized Medicine

Background:

  • Accurate hydration monitoring is essential for athletic performance and health.
  • Existing methods for sweat analysis are often complex or invasive.
  • There is a need for user-friendly, real-time hydration assessment tools.

Purpose of the Study:

  • To develop a disposable, colorimetric dermal patch for chronological sweat collection and in situ measurement.
  • To enable user-friendly, real-time monitoring of sweat secretion over small skin areas.
  • To create a mass-customizable system for personalized hydration monitoring.

Main Methods:

  • The patch utilizes radially arranged channels with water-activated dyes that change color upon saturation.
  • An analytical model was developed for mass customization, personalizing patch design to individual sweat rates and usage requirements.
  • Laser-fabricated patches with varying wicking materials, thicknesses, and pore sizes were characterized.

Main Results:

  • The colorimetric patch provides easily identifiable levels of water loss, mappable to personal dehydration levels.
  • Demonstrated accuracy of 98.3% in a proof-of-concept for a runner, simulating various sweating intensities (1.5-15 mg/cm²/min).
  • The system allows for low-cost manufacturing in various sizes for diverse environmental conditions.

Conclusions:

  • The developed dermal patch offers a practical, low-cost solution for real-time, personalized hydration monitoring.
  • The mass-customizable design ensures adaptability for a wide range of users and activity levels.
  • This technology has potential applications in sports science, healthcare, and general wellness.