| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH |
|
|
|
|||||||
|
|||||||||
| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
1 School of Human Kinetics, University of Ottawa, Ottawa, Canada
2 Department of Physical Therapy, Andrews University, Yellow Springs, Ohio, United States
3 Defence R&D Canada, Quebec City, Canada
4 Ottawa Health Research Institute, The Ottawa Hospital, Ottawa, Canada
5 Human Kinetics, University of Ottawa, Ottawa, Canada
* To whom correspondence should be addressed. E-mail: ojay{at}uottawa.ca.
Changes in mean body temperature (
Tb) estimated by the traditional 2-compartment model of ''core'' and "shell" temperatures and an adjusted 2-compartment model incorporating a correction factor, were compared to values measured by whole-body calorimetry. Sixty participants (31M, 29F) cycled at 40% VO2peak for 60 or 90-min in the Snellen Calorimeter, at 24°C or 30°C. The "core" compartment was represented by esophageal (Tes), rectal (Tre) and aural canal (Tau) temperature, and the "shell" compartment was represented by a 12-point mean skin temperature (Tsk). Using Tre and conventional core-to-shell weightings (X) of 0.66, 0.79 and 0.90, mean Tb estimation error for the traditional model was -95.2% [-83.0,-107.3] to -76.6% [-72.8,-80.5] after 10-min, and -47.2% [-40.9,-53.5] to -22.6% [-14.5,-30.7] after 90-min. Using Tre, X=0.80 and a correction factor (X0) of 0.40, mean Tb estimation error for the adjusted model was +9.5% [+16.9,+2.1] to -0.3% [+11.9,-12.5] after 10-min, and +15.0% [+27.2,+2.8] to -13.7% [-4.2,-23.3] after 90-min. Quadratic analyses of calorimetry Tb data was subsequently used to derive best-fitting values of X for both models and X0 for the adjusted model for each measure of "core" temperature. The most accurate model at any time point or condition only accounted for 20% of the variation observed in Tb for the traditional model and 56% for the adjusted model. In conclusion, throughout exercise the estimation of Tb using any measure of "core" temperature together with mean skin temperature irrespective of weighting is inaccurate even with a correction factor customized for the specific conditions.
This article has been cited by other articles:
|
|
 |
|
  F. E. Marino, L. Nybo, C. R. Abbiss, P. B. Laursen, S. M. Marcora, S. S. Cheung, and T. D. Noakes Do changes in heat storage mediate an anticipatory regulation of exercise intensity? J Appl Physiol, August 1, 2009; 107(2): 632 - 633. [Full Text] [PDF]
|
|
|
|
|
|
O. Jay and G. P. Kenny Current evidence does not support an anticipatory regulation of exercise intensity mediated by rate of body heat storage J Appl Physiol, August 1, 2009; 107(2): 630 - 631. [Full Text] [PDF]
|
|
|
|
 |
|
 O. Jay, D. Gagnon, M. B. DuCharme, P. Webb, F. D. Reardon, and G. P. Kenny Human heat balance during postexercise recovery: separating metabolic and nonthermal effects Am J Physiol Regulatory Integrative Comp Physiol, May 1, 2008; 294(5): R1586 - R1592. [Abstract] [Full Text] [PDF]
|
|
| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH |
| Visit Other APS Journals Online |
