The "Energy Expenditure Limits" trigger helps identify when a worker exceeds a set amount of energy expenditure within a sliding time window. This feature is essential for preventing excessive exertion, especially in thermal stress environments, but it is also useful for any intense physical activity during operations.
How energy expenditure is calculated
Energy expenditure is calculated in the mobile app using the following data:
Current heart rate (read by the sensor)
Age and weight of the worker
Resting and maximum heart rates (estimated from the last 7 days of use)
For each new heart rate reading, the system generates:
Metabolic rate (in Watts)
Accumulated energy expenditure (in Kcal)
These values are sent to the cloud and update the total for the ongoing shift.
Configurable trigger parameters
When setting up the "Energy Expenditure Limits" trigger, you can define:
Amount of Kcal: between 50 and 5000 Kcal
Time window: between 10 and 720 minutes
Default value: 60 minutes
When the trigger is activated
The system continuously checks whether the accumulated energy in the defined time window has exceeded the limit, comparing the current value with the earlier value from the start of the period.
Practical example:
At 1:30 PM: 323 Kcal accumulated
At 2:30 PM: 538 Kcal accumulated
Difference: 215 Kcal
If the limit is 200 Kcal, the trigger is activated.
Trigger behavior after activation
The trigger remains active while the threshold continues to be exceeded.
As the time component is already factored in, the Minimum Occurrence is always set to Immediate.
A continuously active trigger may indicate that physical effort was not reduced—or even increased.
Dashboard visualization
You can monitor this data using the Accumulated Energy Expenditure line chart, which shows each worker’s progress over time:
Y-axis: Total Kcal
X-axis: Time of day (e.g., 13:00, 13:30, 14:00...)
Line chart with 30-minute markers
Legend showing which workers are displayed
Important notes
If complete worker data is unavailable, the system uses default values:
Weight: 75 kg
Age: 36 years
Resting HR: 65 bpm
Resting heart rate becomes more accurate after 1 week of continuous use.
Trigger activation should be interpreted within the company's operational context—including defining when the condition is considered resolved.