Wearable Thermal Stress Sensor

This shows potential for training/racing in the heat…

“Created by American company Kenzen, this device could help prevent workers from overheating. Once the core body temperature is above 38 degrees Celsius, when symptoms of heat exhaustion are likely to begin, the device vibrates and the user receives a notification on their phone, telling them it’s time to take a break.”

For the hour record, Ganna was wearing one that was just part of his HRM. Dunno which one that was, and if it is available. Seems pretty straight foward. If you can get a datafield on your Garmin etc, you should be able to set alarms to tell you you are overheating.

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Several pro teams use the Core sensor: