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Sweat analysis: the future of connected watches

Sweat could be the key to taking smartwatches to the next level. Scientists around the world are developing innovative technologies to analyze sweat in real time, paving the way for more precise and personalized monitoring of health and sports performance. Although companies like Apple or Samsung have not yet commercialized this technology, the advances are promising. The latest example is a โ€œsweat sensor smartwatchโ€ that can continuously measure levels of key ions such as potassium, sodium and calcium.

Why is sweat analysis so important?

Sweat contains a wealth of valuable information about our health and physical performance. Accurate analysis of ions present in sweat can be particularly useful to athletes, as it allows them to:

  • Plan personalized fluid and electrolyte replacement strategies
  • Treating electrolyte imbalances that can cause heat cramps
  • Monitor sodium loss, crucial for fluid balance, nerve transmission and muscle movement
  • Control potassium levels, important for regulating pH, blood pressure and heart health
  • Each person loses a different amount of these ions through sweat, so taking a personalized approach is essential. Smartwatches with sweat sensors could provide tailored information to optimize performance and prevent health problems.

    A glimpse into the future of wearables

    The connected watch developed by Chinese researchers is based on a microfluidic chip, a standardized sensor matrix and a signal processing unit. Its strong points are:

  • Multiple detection modules allowing multiple ions to be analyzed simultaneously
  • Mass-produced sensor arrays for highly selective monitoring
  • Impressive stability, able to operate for more than six months
  • According to the team behind the project, the scalable manufacturing of these sensors will lay the foundation for the development of reliable sweat-detecting wearables in the future.

    But this is not the only promising development in this area. In recent years we have seen developments such as:

  • A wireless sensor patch for continuous sweat analysis (Korea Institute of Science and Technology)
  • A microfluidic sensor of lactate in sweat, a key marker of training intensity and muscle fatigue (Tokyo University of Science)
  • A sweat biosensor embedded in fabric to measure chloride ions (Tokyo University of Science)
  • A sweat-based wearable sensor to detect illicit drugs in the body (Korea Institute of Materials Science)
  • Experts agree that advances in microfluidics are very promising. Another technology with great potential is nuclear magnetic resonance (NMR) spectroscopy, although its commercial implementation still seems distant due to the lengthy clinical validation and regulatory approval processes.

    Towards a healthier and sportier future

    Integrating sweat analysis into smartwatches could revolutionize the way we monitor our health and physical performance. Imagine a future where your watch alerts you about electrolyte imbalances, recommends when to hydrate, or even detects harmful substances in your body.

    Although there is still a way to go, recent scientific advances are bringing us closer and closer to this future. Companies like Apple, Samsung or Fitbit are certainly following these developments closely, looking for the right moment to bring this technology to the mainstream market.

    In the meantime, athletes and fitness enthusiasts can take comfort in knowing that big improvements are coming in monitoring their performance and well-being. Sweat, which many consider just a byproduct of exercise, could be the key to unlocking the full potential of smartwatches. Who would have believed it ?

    SRQ Backlot