Validity, Reliability, and Inertia of Four Different Temperature Capsule Systems.

Purpose: Telemetric temperature capsule systems are wireless, relatively non-invasive and easily applicable in field conditions, and have therefore great advantages for monitoring core body temperature. However, the accuracy and responsiveness of available capsule systems have not been compared previously. Therefore, the aim of this study was to examine the validity, reliability and inertia characteristics of four ingestible temperature capsule systems (i.e. CorTemp, e-Celsius, myTemp and VitalSense). Methods: Ten temperature capsules were examined for each system in a temperature controlled water bath during three trials. The water bath temperature gradually increased from 33[degrees]C to 44[degrees]C during Trial 1 and 2 to assess the validity and reliability, and from 36[degrees]C to 42[degrees]C in Trial 3 to assess the inertia characteristics of the temperature capsules. Results: A systematic difference between capsule and water bath temperature was found for CorTemp (0.077[degrees]C+/-0.040[degrees]C), e-Celsius (-0.081[degrees]C+/-0.055[degrees]C), myTemp (-0.003[degrees]C+/-0.006[degrees]C) and VitalSense (-0.017[degrees]C+/-0.023[degrees]C) (p0.05). Comparable inertia characteristics were found for CorTemp (25+/-4 sec), e-Celsius (21+/-13 sec) and myTemp (19+/-2 sec), while the VitalSense system responded more slowly (39+/-6 sec) to changes in water bath temperature (p

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