Arterial vs. rectal temperature in ponies: rest, exercise, CO2 inhalation, and thermal stresses.
Abstract: We assessed in ponies the adequacy of using rectal (Tre) rather than arterial temperature (Tar) under conditions common to ventilatory control experiments, i.e., CO2 breathing, thermal stress, and particularly exercise. We were interested in whether, and to what extent, Tar-Tre differences could lead to errors in arterial blood gas corrections. At control environmental temperatures (Ta) of 5 degrees C in the winter and 21 degrees C in the summer, Tar and Tre (37.1 degrees C) did not differ (P greater than 0.05). Elevating winter or summer Ta by 10-18 degrees C for 2-days or lowering summer Ta by 9 degrees C (2-days) did not change Tar or Tre (P greater than 0.05). Furthermore, elevating inspired PCO2 to 42 Torr for 15 min did not alter Tar or Tre from control (P greater than 0.05). During treadmill exercise, at 1.8 mph 5% grade, Tar and Tre did not change significantly (P greater than 0.05) from rest by 11 min of work. At 3 mph 5% grade, Tar increased progressively by 0.3 degrees C (P less than 0.05) while Tre tended to increase 0.1 degree C by 11 min. During moderate exercise at 6 mph 5% grade, Tar increased 0.9 degree C (P less than 0.05) while Tre increased 0.25 degree C (P less than 0.05). Finally, by 6 min of heavy exercise at 8 mph 20% grade, Tar increased 2 degrees C (P less than 0.05) while Tre increased 0.5 degree C (P less than 0.05). The Tar-Tre differences during the latter three work loads were statistically significant (P less than 0.01).(ABSTRACT TRUNCATED AT 250 WORDS)
Publication Date: 1986-10-01 PubMed ID: 3781969DOI: 10.1152/jappl.1986.61.4.1577Google Scholar: Lookup
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- Journal Article
- Research Support
- U.S. Gov't
- Non-P.H.S.
- Research Support
- U.S. Gov't
- P.H.S.
Summary
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The research focuses on comparing arterial temperature (Tar) and rectal temperature (Tre) in ponies under various conditions like CO2 inhalation, thermal stress, and exercise. The study aims to determine if differences between Tar and Tre can influence arterial blood gas corrections. Under the majority of conditions, no significant difference was observed in Tar and Tre, but during intense exercise scenarios, Tar increased more substantially than Tre.
Experimental Conditions
- The researchers exposed ponies to conditions commonly found in ventilatory control experiments.
- These conditions included CO2 inhalation, thermal stress (with high and low environmental temperatures), and various intensities of exercise.
- During rest periods in winter (5 degrees C) and summer (21 degrees C), no statistically significant difference was observed between Tar and Tre.
- Both Tar and Tre remained constant even when the environmental temperature was increased or decreased by 9-18 degrees C for two days.
- Raising the inspired PCO2 to 42 Torr for 15 minutes didn’t cause any significant change in the Tar or Tre.
- During light and moderate treadmill exercises, Tar and Tre remained fairly stable, with only minor increase observed.
- However, during intensive exercise programs, Tar increased more than Tre. Specifically, Tar increased by 2 degrees C during heavy exercise at 8 mph 20% grade while Tre increased by only 0.5 degrees C. These differences were statistically significant, indicating that exercise intensity influences the Tar-Tre difference.
- This research indicates that while Tar and Tre readings mostly align under standard and stress conditions, heavy physical work can create a significant difference between the two measurements. This difference could lead to errors in arterial blood gas corrections if not taken into account.>
Findings at Control Environmental Temperatures
Influence of CO2 Inhalation
Impact of Exercise
Conclusion
Cite This Article
APA
Pan LG, Forster HV, Kaminski RP.
(1986).
Arterial vs. rectal temperature in ponies: rest, exercise, CO2 inhalation, and thermal stresses.
J Appl Physiol (1985), 61(4), 1577-1581.
https://doi.org/10.1152/jappl.1986.61.4.1577 Publication
Researcher Affiliations
MeSH Terms
- Animals
- Arteries / physiology
- Body Temperature
- Carotid Body / physiology
- Denervation
- Horses / physiology
- Hot Temperature
- Physical Exertion
- Rectum
- Respiration
- Rest
- Stress, Physiological / physiopathology
Grant Funding
- 5F32-HL-06899-02CLN / NHLBI NIH HHS
- HL-25730 / NHLBI NIH HHS
Citations
This article has been cited 3 times.- Poon CS, Tin C, Song G. Submissive hypercapnia: Why COPD patients are more prone to CO2 retention than heart failure patients.. Respir Physiol Neurobiol 2015 Sep 15;216:86-93.
- Poon CS, Tin C, Yu Y. Homeostasis of exercise hyperpnea and optimal sensorimotor integration: the internal model paradigm.. Respir Physiol Neurobiol 2007 Oct 15;159(1):1-13; discussion 14-20.
- Hodgson DR, Rose RJ, Kelso TB, McCutcheon LJ, Bayly WM, Gollnick PD. Respiratory and metabolic responses in the horse during moderate and heavy exercise.. Pflugers Arch 1990 Sep;417(1):73-8.
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