Abstract
Gastrointestinal temperature (Tgint) measurement with a telemetric pill (TP) is increasingly used in exercise science. Contact of cool water with a TP invalidates Tgint assessment. However, what effect a heat sink created in the proximity of a TP may have on the assessment of Tgint remains unknown. We examined the impact of an ice slurry-induced heat sink on Tgint and rectal temperature (Trec) 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 Trec 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 Tgint and Trec were measured continuously. The TPs were swallowed 10 h prior to the experiments. A bias ≤0.27 °C was taken as an indication that Tgint and Trec 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 Tgint and Trec 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 Tgint compared with Trec.
Highlights
The telemetric pill (TP) is being increasingly used by exercise scientists, physiologists, sports medicine physicians, and athletic trainers interested in determining and understanding the impact of various interventions on human thermoregulation during exercise [1]
Our results indicate that ice slurry ingestion following exercise does not impact TP-derived assessment of therefore provides a measure of gastrointestinal temperature (Tgint) compared with Trec
It has generally been accepted that Tgint represents a reliable measurement of core temperature during exercise [3]
Summary
The telemetric pill (TP) is being increasingly used by exercise scientists, physiologists, sports medicine physicians, and athletic trainers interested in determining and understanding the impact of various interventions on human thermoregulation during exercise [1]. The TP is typically swallowed several hours before data collection and provides a measure of gastrointestinal temperature (Tgint). The popularity of this measurement technique is not surprising, since there are obvious advantages associated with its use. Compared to the more traditional, valid, and accepted method to assess core temperature during exercise, i.e., through the rectum via the use of a rectal probe [2], it is non-invasive, associated with little burden for users, can be used relatively under field conditions, and is not subject to negative preconceptions [3,4]. It has generally been accepted that Tgint represents a reliable measurement of core temperature during exercise [3]. Easton et al [5] had Sports 2019, 7, 198; doi:10.3390/sports7090198 www.mdpi.com/journal/sports
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