Gastrointestinal temperature measurement from ingestible pills provided 3 hours preexercise is insufficient to avoid interference caused by tepid water ingestion

Purpose: This study aimed to evaluate the effect of telemetric-pill ingestion timing on gastrointestinal temperature measurements during exercise with tepid fluid intake.

Methods: Twelve participants swallowed temperature pills 12, 3, or 0.5 hours before completing 60 minutes of treadmill running, consuming 200 mL of room-temperature water every 15 minutes.

Results: Pills ingested 0.5 or 3 hours before exercise resulted in significantly lower gastrointestinal temperature compared with those ingested 12 hours prior.

Conclusions: These results indicate that ingesting pills closer to exercise with fluid ingestion may confound gastrointestinal temperature measurements, underlining the need for sufficient ingestion time before exercise to avoid interference with fluid intake.