PKVitality has been showing off its upcoming K'Watch Athlete wearable. The device has been constructed to help athletes involved in either endurance or explosive sports to monitor their lactic acid levels without the need for analyzing blood samples. The K'Watch Athlete, which offers continuous lactate monitoring, can be worn as a smartwatch or armband.
https://www.notebookcheck.net/K-Watch-Athlete-wearable-delivers-continuous-lactate-monitoring-without-the-need-for-blood-samples.582700.0.html