Posted on - June 14, 2022

Ministry of Defense – The ARMOR Heat Monitor

The effect of heavy training and deployments on soldiers’ health remains unclear, which is why —in collaboration with the Dutch Ministry of Defense— we developed the ARMOR Heat Monitor to monitor the heat stress of soldiers continuously and in real time.

The project

The Defense Training Centers of the Dutch Ministry of Defense were concerned about the soldiers’ exposure and risk of heat injury, as distances, gear and outside temperatures are factors that cannot be influenced. In that sense, EVALAN’s team was asked to help develop an accurate and reliable heat monitoring solution. The result: the ARMOR Heat Monitor, which monitors the core body temperature during a training routine and helps military trainers and recruits detect heat stress on time.

The problem

Heat stress, and thus heat injury, is a significant problem among soldiers. Heavy gear, protective clothing, and strenuous physical exertion cause the core body temperature to rise sharply. The consequences of this can be serious, think of disorientation, loss of consciousness, or seizures. These heat-related injuries can lead to permanent health damage and even death. Therefore, EAVALAN was asked to develop an accurate and reliable heat monitoring solution. The result: The ARMOR Heat Monitor.

The solution

The ARMOR Heat Monitor consists of a heart rate sensor, the ARMOR device, and the ARMOR app. From the heart rate data, the core body temperature of each soldier is estimated, and this information is sent to the app. The app provides an overview with details of all participants. For each participant, the current estimated core body temperature, and the physiological strain index (PSI) are shown. The PSI is a rating of the relative heat strain on a scale of 1 to 12. As soon as the heat strain of a participant is too high, the app will sound an alarm. The supervisor can then intervene immediately and initiate actions according to a defined protocol. 

The device helps to identify the first indications that cause heat stress and serves as an incentive for a medical check to prevent this.

The key benefits

  • Accurately collects heart rate data and estimates the core body temperature. 
  • Helps to identify an increased risk of heat-related injury.
  • A comfortable and non-invasive way of monitoring heat stress. 
  • Clear overview with the PSI score of each soldier. 
ARMOR heat monitor
ARMOR sensor

More information

ECTemp algorithm 

The ARMOR Heat Monitor measures the heart rate with a standard Bluetooth sensor. The data is processed with the patented ECTemp algorithm, resulting in an accurate estimate of core body temperature. This integrated ECTemp algorithm used to estimate core body temperature is developed by the United States Army Research Division (USARIEM) and has been extensively tested for accuracy. It is used for ARMOR Heat Monitor under license. 

The ARMOR app shows the current estimated core body temperature and the PSI. It identifies the risks to the participants using a color scheme (green, orange, red) that can be customized by the supervisor. 

The ARMOR Heat Monitor has been tested in various training situations by the Dutch army. Currently, more than 2,000 ARMOR Heat Monitor systems are in use at Defense training centers in the Netherlands. 

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