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Gastrointestinal temperature ( T gint) measurement with a telemetric pill (TP) is increasingly used in exercise science. Contact of cool water with a TP invalidates T gint assessment. However, what effect a heat sink created in the proximity of a TP may have on the assessment of T gint remains unknown. We examined the impact of an ice slurry-induced heat sink on T gint and rectal temperature ( T rec) following exercise. After 20 min of seating (20-22 °C, 25-40% relative humidity (RH)), 11 men completed two intersperse exercise periods (31-32 °C, 35% RH) at 75-80% of estimated maximal heart rate until a T rec increase of 1 °C above baseline level. Following the first exercise period, participants were seated for 45 min and ingested 7.5 g·kg -1 of thermoneutral water, whereas, following the second period, they ingested 7.5 g·kg -1 of ice slurry. Both T gint and T rec were measured continuously. The TPs were swallowed 10 h prior to the experiments. A bias ≤0.27 °C was taken as an indication that T gint and T rec provided similar core temperature indices. Mean biases and 95% limits of agreement during passive sitting, first exercise, water ingestion, second exercise, and ice slurry ingestion periods were 0.16 ± 0.53, 0.13 ± 0.41, 0.21 ± 0.70, 0.17 ± 0.50, and 0.18 ± 0.66 °C, respectively. The rates of decrease in T gint and T rec did not differ between the water and ice slurry ingestion periods. Our results indicate that ice slurry ingestion following exercise does not impact TP-derived assessment of T gint compared with T rec.

The Impact of an Ice Slurry-Induced Gastrointestinal Heat Sink on Gastrointestinal and Rectal Temperatures Following Exercise