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Intestinal temperature does not reflect rectal temperature during prolonged, intense running with cold fluid
Félix A Savoie1, Tommy Dion, Audrey Asselin
1Research Centre on Aging, University of Sherbrooke, Sherbrooke, Québec J1H 4C4, Canada. Faculty of Physical Education and Sports, University of Sherbrooke, Sherbrooke, Québec J1K 2R1, Canada.
Physiological Measurement
|January 14, 2015
Summary
Intestinal temperature (Tint) does not accurately reflect rectal temperature (Trec) during prolonged, intense running, especially when consuming cold fluids. These core body temperature measures should not be used interchangeably in such scenarios.
Area of Science:
- Exercise Physiology
- Sports Science
- Human Thermoregulation
Background:
- Intestinal temperature (Tint) is often assumed to correlate well with rectal temperature (Trec) during exercise.
- The validity of Tint as a proxy for Trec during prolonged, intense exercise with cold fluid ingestion remains unestablished.
Purpose of the Study:
- To compare intestinal temperature (Tint) and rectal temperature (Trec) during a half-marathon.
- To investigate if Tint accurately reflects Trec during prolonged, intense exercise with cold fluid ingestion.
Main Methods:
- Nine endurance athletes completed a 21.1km running time-trial in heat (~30°C, 44% RH).
- Body weight losses were maintained at ~1% via continuous cold (4°C) water provision.
- Intestinal temperature (Tint) and rectal temperature (Trec) were monitored throughout the event.
Main Results:
- Rectal temperature (Trec) was systematically higher than intestinal temperature (Tint) by 0.25°C.
- Excellent relative agreement (r=0.90) was observed between Tint and Trec.
- Poor absolute agreement was found, with a 95% limit of agreement of ±1.07°C.
Conclusions:
- Intestinal temperature (Tint) does not mirror rectal temperature (Trec) during prolonged, intense running with cold fluid ingestion.
- Tint and Trec measurements are not interchangeable under these specific exercise conditions.
- Further research may be needed to understand discrepancies in core body temperature monitoring.
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