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An ingestible telemetric temperature sensor for measuring body core temperature (Tc) was first described 45 years ago, although the method has only recently gained widespread use for exercise applications. This review aims to (1) use Bland and Altman's limits of agreement (LoA) method as a basis for quantitatively reviewing the agreement between intestinal sensor temperature (Tintestinal), oesophageal temperature (Toesophageal) and rectal temperature (Trectal) across numerous previously published validation studies; (2) review factors that may affect agreement; and (3) review the application of this technology in field-based exercise studies. The agreement between Tintestinal and Toesophageal is suggested to meet our delimitation for an acceptable level of agreement (ie, systematic bias &lt;0.1 degrees C and 95% LoA within +/-0.4 degrees C). The agreement between Tintestinal and Trectal shows a significant systematic bias &gt;0.1 degrees C, although the 95% LoA is acceptable. Tintestinal responds less rapidly than Toesophageal at the start or cessation of exercise or to a change in exercise intensity, but more rapidly than Trectal. When using this technology, care should be taken to ensure adequate control over sensor calibration and data correction, timing of ingestion and electromagnetic interference. The ingestible sensor has been applied successfully in numerous sport and occupational applications such as the continuous measurement of Tc in deep sea saturation divers, distance runners and soldiers undertaking sustained military training exercises. It is concluded that the ingestible telemetric temperature sensor represents a valid index of Tc and shows excellent utility for ambulatory field-based applications.

The ingestible telemetric body core temperature sensor: a review of validity and exercise applications