You're only ever going to be able to measure skin temperature rather than body temperature, unless you keep the sensor in your mouth, ear or rear entrance all the time. AFAIK, skin temperature is fairly useless for what you want to do with it. There are medical-grade temperature sensors that you can swallow, but they last only until your next #2 and I doubt they're available to consumers to be honest. Answer from svenvbins on reddit.com
Slowtwitch
forum.slowtwitch.com › triathlon forum
Core body temperature sensor substitute - Triathlon Forum - Slowtwitch Forum
July 30, 2024 - Original core brand is kind a expensive for me. Is there any senaor that can do the same or what can i use. I am just curious about this body temperature thig that is going right now. Is there any aliexpress variant? :slight_smile: Or i kust simply use my thermometer for measuring temperature ...
MDPI
mdpi.com › 2076-3417 › 13 › 11 › 6803
Assessing Non-Intrusive Wearable Devices for Tracking Core Body Temperature in Hot Working Conditions
June 3, 2023 - Due to this limitation, using an ingestible telemetric pill that records gastrointestinal temperature from the time of ingestion until it is expelled has been reported as another way of monitoring the core temperature [14,15,16]. Research has shown that the temperature measurements taken by these telemetric pills are comparable to measurements taken from the esophagus and rectum during physical activity in hot environments [17]. One example of this pill is the Ingestible Core Body Temperature Sensor (ICTS) developed by CorTemp®. When the ICTS has been ingested, the signal from the sensor is h
body temperature sensor?
You're only ever going to be able to measure skin temperature rather than body temperature, unless you keep the sensor in your mouth, ear or rear entrance all the time. AFAIK, skin temperature is fairly useless for what you want to do with it. There are medical-grade temperature sensors that you can swallow, but they last only until your next #2 and I doubt they're available to consumers to be honest. More on reddit.com
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March 3, 2023Core 2 Body Temp Sensor Released Today
They are doing a trade in program for those with the Core 1 sensor. And interestingly enough Zwift will be adding support for body temperature: Would love to see TR do the same. More on trainerroad.com
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March 25, 2025Which sensor should I use to measure body temperature?
Hello, I'm starting a new project, and I need a way to get an accurate body temp reading from the forehead. I'm considering using an IR Temperature sensor like an MLX90614 or an MLX90632 and including it in a patch you put on your forehead. Is this the best sensor to use, or are there other ... More on forum.arduino.cc
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December 13, 2024What is the best sensor to use in a wearable device to monitor body temperature on a continuous basis: Thermistor, RTD or a semiconductor device? - Electrical Engineering Stack Exchange
There is a literature on skin temp ... not good enough to estimate core temp, but probably good enough to identify febrile conditions. \$\endgroup\$ ... The problem of monitoring body temperature in a wearable device is were to place the sensor.... More on electronics.stackexchange.com
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Slowtwitch
forum.slowtwitch.com › triathlon forum
Core body temperature sensor substitute - #9 by Road_to_226 - Triathlon Forum - Slowtwitch Forum
July 30, 2024 - Just how high should room tempreaure be??I don’t follow this. You just take a normal household thermometer, put it under your tongue, and in a moment it will show your core temperature. How high should i warm my trainig ROOM? Room. Place when i train. Pain cave. A no wife zone. 🙂 Get it now?
PubMed Central
pmc.ncbi.nlm.nih.gov › articles › PMC9043456
Non-Invasive Monitoring of Core Body Temperature for Targeted Temperature Management in Post-Cardiac Arrest Care - PMC
SpotOn™ is applied to the forehead, creates an isothermic tunnel under the measurement site by insulating heat loss from the skin surface, and estimates core body temperature using the zero-heat-flux technology (7). In perioperative settings, SpotOn™ showed good correlation, accuracy, and precision when compared to esophageal, nasopharyngeal, and pulmonary artery sensors (8–10) and was better than bladder temperature sensors (10).
PubMed Central
pmc.ncbi.nlm.nih.gov › articles › PMC12900156
A Comprehensive Review of Non-Invasive Core Body Temperature Measurement Techniques - PMC
Ingestible sensors, also referred to as smart pills, are non-invasive monitoring technologies that are orally administered, introduced into the gastrointestinal (GI) tract, and capable of measuring physiological signals from within the body and wirelessly transmitting the data to an external receiver [64,65,66]. At present, GI temperature measurement using ingestible sensors is widely employed as an alternative approach for CBT assessment, replacing invasive measurements such as rectal or esophageal temperature monitoring [64]. The operating principle of ingestible temperature sensors is relat
Reddit
reddit.com › r/homeassistant › body temperature sensor?
r/homeassistant on Reddit: body temperature sensor?
March 3, 2023 -
not a real HA topic, but is there any good way to track body temperature? In case someone is ill and have fever, do we have decent sensor to measure body temperature? I would like to make a strap on/wearable device (doesn't need to be portable) that could be used in case virus hits someone hard and you stay in the bed. Unfortunately it is easier to make diy ECG than body temp sensor.
Am I stupid? Also... where is a decent point to attach such a device for prolonged period of time? I doubt one want to spend whole day with sensor inside mouth...
Edit: sensor I mean sensor module for DIY sensor for arduino/ESPhome.
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You're only ever going to be able to measure skin temperature rather than body temperature, unless you keep the sensor in your mouth, ear or rear entrance all the time. AFAIK, skin temperature is fairly useless for what you want to do with it. There are medical-grade temperature sensors that you can swallow, but they last only until your next #2 and I doubt they're available to consumers to be honest.
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My first thought is a watch. You'd need to look at specs and do some research but I hope apps like Google Fit that can track temperature etc have their data in a cloud friendly format. Just checked ... They do have a rest api that could be used.
Core Body Temperature
corebodytemp.com › pages › wearable-core-body-temperature-sensors
Wearable Core Body Temperature Sensors – CORE
CORE is clearly the best and most accurate wearable core body temperature sensor. You can learn more about the inovatve technology behind CORE here. Monitoring core body temperature is important for athletic performance. A wearable core body temperature sensor, such as CORE, allows for continual, non-invasive measurements. A number of alternatives exist for measuring core body temperature, but they are eithe invasive, inaccurate, non-continuous, or some combination of the three.
Thermalhyperformance
thermalhyperformance.com.au › post › core-temperature-wearables-are-we-there-yet
Core Temperature Wearables - Are We There Yet?
April 8, 2026 - Unlike the CORE and Kenzen options, Cosinuss° is an "in-ear" sensor with a battery life of up to 24hrs. Cosinuss° states "Our ergonomic wearables offer a more cost-effective and accurate alternative to the competition for measuring the following: blood oxygen saturation, core body temperature, heart rate, heart rate variability, respiratory rate and position/acceleration".
TrainerRoad
trainerroad.com › equipment
Core 2 Body Temp Sensor Released Today - Equipment - TrainerRoad
They are doing a trade in program for those with the Core 1 sensor. And interestingly enough Zwift will be adding support for body temperature: Would love to see TR do the same.
Published March 25, 2025
PubMed
pubmed.ncbi.nlm.nih.gov › 38033330
Comparing body temperature measurements using the double sensor method within a wearable device with oral and core body temperature measurements using medical grade thermometers-a short report - PubMed
November 14, 2023 - In both studies, stratifying patients based on BMI and skin tone showed high accordance in all sub-groups. Discussion: The wearable monitor showed high correlation with oral and core body temperature measurements in different clinical scenarios. Keywords: continuous monitoring; double sensor method; heat-flux sensor; remote patient monitoring; wearable monitoring.
Arduino Forum
forum.arduino.cc › projects › general guidance
Which sensor should I use to measure body temperature? - General Guidance - Arduino Forum
December 13, 2024 - Hello, I'm starting a new project, and I need a way to get an accurate body temp reading from the forehead. I'm considering using an IR Temperature sensor like an MLX90614 or an MLX90632 and including it in a patch you …
ScienceDirect
sciencedirect.com › science › article › abs › pii › S0360132325007681
Validity of the wearable CORE temperature sensor during 8-hour indoor heat exposure with and without electric fan use - ScienceDirect
June 11, 2025 - The pulmonary artery catheter is the gold standard for core temperature measurement as it has a quicker response rate but is limited to clinical and surgical settings due to its invasiveness [7,8]. Esophageal temperature is considered the most ...
DC Rainmaker
dcrainmaker.com › 2020 › 08 › sensor-garmin-integration.html
Hands-on: CORE’s New Skin/Body Temp Sensor with Garmin/Wahoo integration | DC Rainmaker
September 2, 2024 - You would be right if you are ... make on-location in Switzerland and is the first wearable sensor that provides medically accurate and continuous core body temperature monitoring. Previously, the main alternative for sports people are ingested e-pills which cost ...
PubMed Central
pmc.ncbi.nlm.nih.gov › articles › PMC2465229
The ingestible telemetric body core temperature sensor: a review of validity and exercise applications - PMC
An alternative method of Tc measurement, particularly suited to field‐based ambulatory applications, is the ingestible telemetric temperature “pill” or “capsule”. An ingestible “radio pill” was first described >45 years ago,8 with technological modifications on this theme continuing ...
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In general, thermistors are the sensor of choice for measuring body temperature. They are sensitive, cheap, and their accuracy is adequate. After all, body temperature does not need to be measured to better than about 0.1 degree F.
With that said, measuring body temperature at the wrist is a losing proposition. There are simply too many chances for wrong temperature readings. The wrist, after all, is out at the end of the arms, with lots of opportunity for heat loss, and who knows what your hands have been holding on to.
Another way to look at it is that all available sensors are inadequate - they measure the actual local temperature rather than the body core temperature.
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The problem of monitoring body temperature in a wearable device is were to place the sensor. The skin of arms and legs are known for delivering bad results. The temperature there is some kelvin lower than the body core temperature. The difference is not constant, if you feeel cold, the body reduces the blood flow thru arms and legs in order to keep the body core temperature. The only place for good results is the ear canal.
Reddit
reddit.com › r/velo › core temperature sensor
r/Velo on Reddit: Core temperature sensor
September 21, 2024 -
Those of you who bought a core temperature sensor, was it worth it? If you dont want to use it for heat training specifically, is it useful for general training as well? Like can you wait till your body body has cooled down again between efforts and improve training quality that way or stuff like that? Especially on the trainer where heat is generally an issue.
Also the only company I know of that makes a sensor is greenTEG and it costs 280€. Thats a hell of a lot for a freakin thermometer with a bluetooth/ANT+ function. Hopefully some asian company realizes that they can make a bit of money and comes up with a cheaper option to sell on aliexpress.
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I just ride with a meat thermometer up my bung
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no. it's super slow to respond. you'd be waiting 15-20 minutes for a drop. might as well just go off hr. also, no, it's not worth it and no, it's not even really that useful for heat training (i.e., at the beginning of the summer it absolutely sucks, and by August you've acclimated a bit and it still sucks but is more manageable). the core sensor doesn't tell you anything more than what you already know. and the sensor itself has a very flimsy clip that almost assuredly will break, probably a fe wdays after the warranty. and the clip is the actual sensor, so there's no replacing it. the only recourse is a paltry discount on another very expensive sensor.
Reddit
reddit.com › r/running › device to monitor body temperature while running?
r/running on Reddit: Device to monitor body temperature while running?
June 27, 2023 -
I had heat stroke at a marathon last year, so I want to take whatever precaution I can to prevent that from happening again. I'm familiar with all the early symptoms of heat stroke, as well as all the standard ways to prevent it.
But I'm looking for a good device to monitor body temp while running to help me detect when I'm getting near the danger zone. Anyone have any good suggestions? Anyone have good experience with the Core sensor or hDrop or anything other device for this purpose? Being able to see my body temp on my Garmin watch would be a big plus.
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Bluetooth Rectal thermometer connected to your Garmin and Strava accounts.
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Heatstroke (and hypothermia) have little to do with ambient or skin temp and more to do with core temperature You could get a swallowable sensor that they use in the Navy for training but that is overkill just hydrate properly (including electrolytes) and use loose fitting, light colored clothing (preferably white) Source: where I live is 90 degrees, 90% humidity year round.
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We have had successful rests in measuring core body temperature via heat flux double sensor.
It's seen use on board the international space station, Antarctic winter crews, as well as the operating room. Also, it has been recently field tested during centrifuge runs. The data is promising.
The Double Sensor—A non-invasive device to continuously moni...
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Good morning,
Have you seen the pills for core body temperature?
http://www.hqinc.net/cortemp/products/
http://www.bmedical.com.au/shop/activity-heat-research/core-body-temperature.htm
They are wireless, real-time temperature info and 24 h of continuous recording (approx). I don't know the cost, but I think that it could be an elegant solution. Eus JW Van Someren (Netherlands) used it with good results. You could ask him for more information.
http://www.neurosciencecampus-amsterdam.nl/en/people/staff-a-z/staff-s-t/van-someren/
Good luck!
Best
Antonio
MDPI
mdpi.com › home › journals › sensors › volume 22 › issue 13 › 10.3390/s22134760
A Novel Non-Invasive Thermometer for Continuous Core Body Temperature: Comparison with Tympanic Temperature in an Acute Stroke Clinical Setting | MDPI
June 23, 2022 - The forehead is also used as a site of measurements for the zero-heat-flux method and the double sensors method—non-invasive solutions to estimate core body temperature that were shown to be reliable in a wide set of conditions [58,59,60]. Indeed, several active or passive sensing techniques for the non-invasive estimation of core body temperature based on heat flow have been proposed.