Human Core Temperature Responses during Exercise and Subsequent Recovery: An Important Interaction between Diurnal Variation and Measurement Site
- 1 January 2009
- journal article
- research article
- Published by Taylor & Francis Ltd in Chronobiology International
- Vol. 26 (3), 560-575
- https://doi.org/10.1080/07420520902885981
Abstract
Chronobiological investigations into core temperature during and after exercise can involve ambulatory measurements of intestinal temperature during actual competitions, esophageal temperature measurements in laboratory simulations, or rectal temperature, which can be measured in both the field and laboratory. These sites have yet to be compared during both morning and afternoon exercise and subsequent recovery. At 08:00 and 17:00h, seven recreationally active males exercised at 70% peak oxygen uptake for 30min and then recovered passively for 30min. During the experiment, esophageal, rectal, intestinal, and skin temperatures, plus sweat loss, heart rate, and ratings of perceived exertion (RPE), were monitored. We found that the diurnal variation in intestinal temperature responses (0.450.32C; meanSD) was significantly larger compared with rectal (0.330.24C) and, particularly, esophageal temperature responses (0.210.20C; p= 0.019). This reflected a greater difference of 0.25-0.40C between the esophagus and the other two sites in the afternoon, compared to inter-site differences of only 0.13-0.16C in the morning. Diurnal variation was small for skin temperature, heart rate, sweat loss, and RPE responses during exercise (p0.05). Our data suggest that the relative differences between intestinal, rectal, and esophageal temperature during exercise and subsequent recovery depend on time of day to the extent that inferences from studies on experimental and applied chronobiology will be affected.Keywords
This publication has 39 references indexed in Scilit:
- Bright Light and Thermoregulatory Responses to ExerciseInternational Journal of Sports Medicine, 2007
- Effect of Time of Day on Aerobic Contribution to the 30‐s Wingate Test PerformanceChronobiology International, 2007
- The circadian rhythm of core temperature: Effects of physical activity and agingPhysiology & Behavior, 2006
- The Circadian Body Temperature Rhythm in the Elderly: Effect of Single Daily Melatonin DosingChronobiology International, 2006
- Sweating responses to a sustained static exercise is dependent on thermal load in humansActa Physiologica Scandinavica, 2002
- Sleep and 24 hour body temperatures: a comparison in young men, naturally cycling women and women taking hormonal contraceptivesThe Journal of Physiology, 2001
- A COMPARISON OF THE IMMEDIATE EFFECTS OF MODERATE EXERCISE IN THE EARLY MORNING AND LATE AFTERNOON ON CORE TEMPERATURE AND CUTANEOUS THERMOREGULATORY MECHANISMSChronobiology International, 2000
- Circadian Variation in Sports PerformanceSports Medicine, 1996
- Validation of a temperature telemetry system during moderate and strenuous exerciseJournal of Thermal Biology, 1993
- Effect of environment on temperatures in the viscera of the dogInternational Journal of Biometeorology, 1971