Related Experiment Video
Updated: Aug 13, 2026

In Vivo Telemetry to Record Long-Term Cardiovascular Parameters, Temperature, and Activity in Spinal Cord Injury Rat Models
Published on: January 2, 2026
Validity of Calera® Sensor for Assessing Core Temperature During Arm Crank Exercise in Individuals with Spinal Cord
Jose Luis Sanchez-Jimenez1, Rosa M Cibrian-Ortiz de Anda2, Soraya Martin-Manjarres3,4
1Research Group in Sports Biomechanics (GIBD), Department of Physical Education and Sports, University of Valencia, Valencia, Spain.
Background:
Wearables that allow core temperature to be monitored are an important development for athletes with spinal cord injury (SCI) due to their increased risk of suffering heat-related illness.
Objectives:
To assess the validity of the Calera® heat flux sensor compared to ingestible telemetric pills (BodyCap) for monitoring core temperature during a graded exercise test in individuals with SCI and non-SCI participants.
Methods:
Twenty-one participants were included (SCI, 12; non-SCI, 9). The participants conducted a graded exercise test that consisted of 3-minute stages with 1-minute rest intervals, and core temperature was continuously measured using ingestible telemetric pills and the Calera® heat flux sensor. Intraclass correlation coefficients (ICC) and bias were calculated to assess agreement between methods, with comparisons made between SCI and non-SCI groups.
Results:
In non-SCI participants, agreement between the methods was good [ICC = 0.65, P < .001; bias = 0.06 (0.22) °C; 95% CI 0.02 to 0.11 °C], while SCI participants showed poor agreement [ICC = -0.12, P = .93; bias = -0.11 (0.46) °C; 95% CI -0.19 to -0.03 °C]. The percentage of measurements where the mean difference between methods exceeded 0.3 °C was 15% in non-SCI participants and 42% in SCI participants.
Conclusion:
The Calera® heat flux sensor is not a valid tool for assessing core temperature in individuals with SCI in moderate thermal environments.
Related Concept Videos
Assessing Body Temperature - Axilla
Step 1: Perform hand hygiene and put on clean gloves to maintain infection control and prevent cross-contamination.
Step 2: Prepare the patient by explaining the procedure to ensure understanding and cooperation. Ensure privacy, expose the axilla, and inform the patient that minimal movement is crucial for an accurate reading.
Step 3: Adjust the patient’s clothing to expose only the axilla. It minimizes...
Equipments Used to Measure Body Temperature
Glass-bulb Thermometer:
Glass-bulb thermometers are hollow glass tubes with a bulb tip containing liquid such as ethanol or mercury. Historically, glass bulb mercury thermometers were the standard device to measure body temperature. Today, mercury thermometers are prohibited in many countries due to the hazardous effects of mercury and the risk of exposure if the glass bulb breaks. In general,...
Assessing Body Temperature - Temporal Artery
Step 1: Perform hand hygiene and don a fresh pair of gloves to prevent cross-infection and ensure patient safety.
Step 2: Explain the procedure to the patient to establish trust. Clear communication establishes trust with the patient, ensures they understand what to expect, promotes cooperation, and enhances comfort during the procedure.
Step 3: Assess the patient's forehead...
Assessing Body Temperature - Rectal
Follow these steps for rectal temperature assessment:
Step 1: Perform hand hygiene and don clean gloves to prevent cross-infection.
Step 2: Position the patient in a side-lying position to better visualize the rectal...
Assessing Body Temperature - Oral
Step 1:
Start by practicing proper hand hygiene to prevent the spread of microorganisms.
Step 2:
Take the thermometer out of the charging unit, switch it on, and wait for the ready sign.
Step 3:
Gently slide the probe cover until a click is heard. This simple action prevents cross-contamination and ensures the correct placement of the probe cover.
Step 4:
Instruct the patient to open their mouth and place...
Temperature Measurement Sites
Oral: When assessing oral temperature, the thermometer tip should be placed under the tongue in the posterior sublingual pocket. It offers accurate readings and can be...

