CORE Thermal Sensor

greenteg AG

About this app

The CORE Thermal Sensor accurately measures your core body temperature and thermal strain on your body – continuously and non-invasively. Thermal data and insights are critical for facilitating safe and effective heat training and for performing optimally on race day. Designed for athletes at all levels, CORE will help to improve your training and performance in your personal adventures or races.

IMPORTANT: The CORE app is designed to work with the CORE device which you can order at www.corebodytemp.com

Here's how it works:
• Set up your CORE sensor: connect your heart rate monitor and sports devices for optimal sensor use.
• Measure your thermal vitals during training: mount the newly designed clip on your heart rate strap and snap in the CORE sensor. Shake the sensor to wake it up, wear it and track your thermal data.
• Core body temperature: the interior temperature deep in your body, including organs and other tissues. A critical measure during sports, it can reach up to 40°C (104°F) during vigorous activity in hot environments. Be aware that hotter is not better – cooler is faster.
• Heat Strain Index: A combination of your core body temperature and skin temperature representing the thermal strain on your body. The real-time feedback on how hard your body is working to stay cool, delivering a value from 0 (no heat strain) to around 10 (extremely high heat strain).
• Heat Zones: Your Heat Strain Index divided into easy-to-use zones. Heat Zone 3 will likely lead to a performance loss, BUT it is the needed stimuli to create adaptations in your body. During heat training, strive for time in heat zone 3. During racing, stay cool and prevent a performance loss by staying in heat zone 1 or 2.
• Heat Training Load: a cumulative daily metric of the heat strain on your body. A daily value of 10 out of 10 indicates ideal contribution to heat adaptations. More is not always better!
• Heat Adaptation Score: Track your heat adaptations over time with effective heat training. Get a heat champion to perform best in the heat. Long-term heat training will most likely lead to improvements also in cool conditions.
• Add your passive heat training: Supplementing your active heat training or general training with passive heat exposure in a sauna or hot bath. You can track your sessions in the app manually, contributing to your heat adaptation score. NOTE: do NOT take your CORE sensor into the sauna or hot environments.

What else you can do in the CORE app:
• Dig into the details: See a breakdown of your thermal data, and even see trends across days, weeks and months.
• Share your CORE metrics with your friends through the social sharing feature, earning more kudos and likes
• Connect your connectivity accounts (e.g. Garmin) to directly synchronize your data after the training.
• Update your sensor to the latest firmware ensuring having the best sensor functionality.

Note:
CORE provides products and services designed for general fitness and training purposes. For accurate measurement readings during sports, a connection to a heart rate monitor is necessary. CORE products and services are not medical devices, not intended to treat or diagnose any disease, and should not be used as a substitute for professional medical advice, diagnosis or treatment. All content available through CORE products and services is for general informational purposes only.

Ratings and reviews

Great product, bad app. To get the sensor to sync data, you have to close and reopen the app multiple times, and it will not stay connected. Even worse, it often simply won't calculate a heat training load even when it's showing you spent significant time in heat zone 3. It's useless for tracking progress and useless for safety/monitoring during training. I will probably return the sensor because the app itself is absolute garbage. What a waste of money

I like the gadget, but the app is pathetic... if fails to connect to the sensor all the time, I spent a huge amount of time trying to troubleshoot it, then it fir some reason connects, but the sensor data is gone... or was never there... it's a headache every time I do my heat training update: it's getting worse with time 🥲

The CORE 2 often drops connection in the phone app when I’m on Zwift, which is frustrating since the CORE app should keep priority. A clearer reconnect option, dropout alerts, and a screen‑awake setting would help. The interface also feels dated. For the price, I expected a more stable and polished experience.

What’s new

• Added option to delete passive Heat Training Load entries.
• Other small bugfixes and improvements.