Time following ingestion does not influence the validity of telemetry pill measurements of core temperature during exercise-heat stress: The journal <i>Temperature</i> toolbox
Sean R. Notley, Robert D. Meade, Glen P. Kenny
Abstract
(~40% peak oxygen consumption), and 45-min recovery. Core temperature was measured throughout using rectal temperature and four telemetric temperature pills (VitalSense®) ingested 12, 6, 3 and 1 h(s) prior to the start of each trial. Data from the two trials were combined and averaged over the final 10-min of rest, exercise, and recovery for analysis. Our primary finding was that the mean squared difference between rectal temperature and each pill did not differ significantly across ingestion times during rest, exercise or recovery (p = 0.056), with those errors ranging from 0.1-0.2°C, 0.2-0.2°C, 0.1-0.2°C, and 0.1-0.2°C for the pills ingested 12, 6, 3, and 1 h(s) before data collection, respectively. While there is a need for larger confirmatory studies, our findings indicate that pill ingestion timing does not significantly influence the validity of telemetry pill temperature as an index of core temperature.