The Impact of an Ice Slurry-Induced Gastrointestinal Heat Sink on Gastrointestinal and Rectal Temperatures Following Exercise
Gastrointestinal temperature (<i>T</i>gint) measurement with a telemetric pill (TP) is increasingly used in exercise science. Contact of cool water with a TP invalidates <i>T</i>gint assessment. However, what effect a heat sink created in the proximity of a TP may have on the...
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| Main Authors: | , , , , , |
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| Format: | Book |
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MDPI AG,
2019-08-01T00:00:00Z.
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| Summary: | Gastrointestinal temperature (<i>T</i>gint) measurement with a telemetric pill (TP) is increasingly used in exercise science. Contact of cool water with a TP invalidates <i>T</i>gint assessment. However, what effect a heat sink created in the proximity of a TP may have on the assessment of <i>T</i>gint remains unknown. We examined the impact of an ice slurry-induced heat sink on <i>T</i>gint and rectal temperature (<i>T</i>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 <i>T</i>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<sup>−1</sup> of thermoneutral water, whereas, following the second period, they ingested 7.5 g·kg<sup>−1</sup> of ice slurry. Both <i>T</i>gint and <i>T</i>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 <i>T</i>gint and <i>T</i>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 <i>T</i>gint and <i>T</i>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 <i>T</i>gint compared with <i>T</i>rec. |
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| Item Description: | 2075-4663 10.3390/sports7090198 |