Validation of a temperature telemetry system during moderate and strenuous exercise

Abstract

1. 1.Esophageal temperature [ T es (18.0 ± 6.1 min)] and pill temperature [ T hti (25.3 ± 9.1 min)] reached steady state faster ( P < 0.05) during moderate exercise (40 min at 40% peak V ̇ O 2 ) than rectal temperature [ T re (37.3 ± 4.6 min)] at T a = 29°C, T dp = 11°C. Steady-state exercise temperatures were lower for T es = 37.18 ± 0.18°C and T hti = 37.20 ± 0.32°C than T re = 37.46 ± 0.15°C ( P < 0.05). 2. 2.During moderate exercise the change in core temperature per time (slope) was greater ( P < 0.05) for T es (0.050 ± 0.013°C min −1) than T hti (0.031 ± 0.014°C min −1) and T re (0.018 ± 0.005°C min −1. During intense exercise the change in T es per minute was twice that for T hti and 5 times that for T re. 3. 3.Overall, T hti tracked dynamic changes in core temperature significantly faster than T re, although T hti did not track dynamic changes as well or as consistently as T es. The concept of using a temperature sensor in a pill may be useful clinically, but mobility of the pill makes this temperature measurement less suitable for research than esophageal or rectal temperature measurements.